diff --git a/eo-runtime/src/main/java/EOorg/EOeolang/AtMemoized.java b/eo-runtime/src/main/java/EOorg/EOeolang/AtMemoized.java
index a8ec9cd33a..229b2720c0 100644
--- a/eo-runtime/src/main/java/EOorg/EOeolang/AtMemoized.java
+++ b/eo-runtime/src/main/java/EOorg/EOeolang/AtMemoized.java
@@ -32,6 +32,7 @@
 import org.eolang.ExFailure;
 import org.eolang.Param;
 import org.eolang.Phi;
+import org.eolang.Versionized;
 
 /**
  * An attribute that knows how to memoize an object.
@@ -39,6 +40,7 @@
  * @since 0.24
  * @checkstyle TypeNameCheck (5 lines)
  */
+@Versionized
 public final class AtMemoized implements Attr {
 
     /**
diff --git a/eo-runtime/src/main/java/EOorg/EOeolang/EOas_phi.java b/eo-runtime/src/main/java/EOorg/EOeolang/EOas_phi.java
index 55e8fe81b8..18cd39ef8c 100644
--- a/eo-runtime/src/main/java/EOorg/EOeolang/EOas_phi.java
+++ b/eo-runtime/src/main/java/EOorg/EOeolang/EOas_phi.java
@@ -32,6 +32,7 @@
 import org.eolang.Data;
 import org.eolang.PhDefault;
 import org.eolang.Phi;
+import org.eolang.Versionized;
 import org.eolang.XmirObject;
 
 /**
@@ -40,6 +41,7 @@
  * @since 1.0
  * @checkstyle TypeNameCheck (5 lines)
  */
+@Versionized
 @XmirObject(oname = "as-phi")
 public class EOas_phi extends PhDefault {
 
diff --git a/eo-runtime/src/main/java/EOorg/EOeolang/EObool$EOand.java b/eo-runtime/src/main/java/EOorg/EOeolang/EObool$EOand.java
index 4ab806c1d2..9a11a0787e 100644
--- a/eo-runtime/src/main/java/EOorg/EOeolang/EObool$EOand.java
+++ b/eo-runtime/src/main/java/EOorg/EOeolang/EObool$EOand.java
@@ -35,6 +35,7 @@
 import org.eolang.Param;
 import org.eolang.PhDefault;
 import org.eolang.Phi;
+import org.eolang.Versionized;
 import org.eolang.XmirObject;
 
 /**
@@ -43,6 +44,7 @@
  * @since 1.0
  * @checkstyle TypeNameCheck (5 lines)
  */
+@Versionized
 @XmirObject(oname = "bool.and")
 public class EObool$EOand extends PhDefault {
 
diff --git a/eo-runtime/src/main/java/EOorg/EOeolang/EObool$EOif.java b/eo-runtime/src/main/java/EOorg/EOeolang/EObool$EOif.java
index 217b2a2207..d58d911302 100644
--- a/eo-runtime/src/main/java/EOorg/EOeolang/EObool$EOif.java
+++ b/eo-runtime/src/main/java/EOorg/EOeolang/EObool$EOif.java
@@ -32,6 +32,7 @@
 import org.eolang.Param;
 import org.eolang.PhDefault;
 import org.eolang.Phi;
+import org.eolang.Versionized;
 import org.eolang.XmirObject;
 
 /**
@@ -40,6 +41,7 @@
  * @since 1.0
  * @checkstyle TypeNameCheck (5 lines)
  */
+@Versionized
 @XmirObject(oname = "bool.if")
 public class EObool$EOif extends PhDefault {
 
diff --git a/eo-runtime/src/main/java/EOorg/EOeolang/EObool$EOor.java b/eo-runtime/src/main/java/EOorg/EOeolang/EObool$EOor.java
index 8f1e1db782..365816d965 100644
--- a/eo-runtime/src/main/java/EOorg/EOeolang/EObool$EOor.java
+++ b/eo-runtime/src/main/java/EOorg/EOeolang/EObool$EOor.java
@@ -35,6 +35,7 @@
 import org.eolang.Param;
 import org.eolang.PhDefault;
 import org.eolang.Phi;
+import org.eolang.Versionized;
 import org.eolang.XmirObject;
 
 /**
@@ -43,6 +44,7 @@
  * @since 1.0
  * @checkstyle TypeNameCheck (5 lines)
  */
+@Versionized
 @XmirObject(oname = "bool.or")
 public class EObool$EOor extends PhDefault {
 
diff --git a/eo-runtime/src/main/java/EOorg/EOeolang/EObool$EOwhile.java b/eo-runtime/src/main/java/EOorg/EOeolang/EObool$EOwhile.java
index fd4cdc5780..dc230694aa 100644
--- a/eo-runtime/src/main/java/EOorg/EOeolang/EObool$EOwhile.java
+++ b/eo-runtime/src/main/java/EOorg/EOeolang/EObool$EOwhile.java
@@ -34,6 +34,7 @@
 import org.eolang.Param;
 import org.eolang.PhDefault;
 import org.eolang.Phi;
+import org.eolang.Versionized;
 import org.eolang.XmirObject;
 
 /**
@@ -42,6 +43,7 @@
  * @since 1.0
  * @checkstyle TypeNameCheck (5 lines)
  */
+@Versionized
 @XmirObject(oname = "bool.while")
 public class EObool$EOwhile extends PhDefault {
 
diff --git a/eo-runtime/src/main/java/EOorg/EOeolang/EObytes$EOand.java b/eo-runtime/src/main/java/EOorg/EOeolang/EObytes$EOand.java
index 3980a54494..522a6e6981 100644
--- a/eo-runtime/src/main/java/EOorg/EOeolang/EObytes$EOand.java
+++ b/eo-runtime/src/main/java/EOorg/EOeolang/EObytes$EOand.java
@@ -32,6 +32,7 @@
 import org.eolang.Bytes;
 import org.eolang.PhDefault;
 import org.eolang.Phi;
+import org.eolang.Versionized;
 import org.eolang.XmirObject;
 
 /**
@@ -40,6 +41,7 @@
  * @since 1.0
  * @checkstyle TypeNameCheck (5 lines)
  */
+@Versionized
 @XmirObject(oname = "bytes.and")
 public class EObytes$EOand extends PhDefault {
 
diff --git a/eo-runtime/src/main/java/EOorg/EOeolang/EObytes$EOas_float.java b/eo-runtime/src/main/java/EOorg/EOeolang/EObytes$EOas_float.java
index 6bba8a40f1..b1ce66197d 100644
--- a/eo-runtime/src/main/java/EOorg/EOeolang/EObytes$EOas_float.java
+++ b/eo-runtime/src/main/java/EOorg/EOeolang/EObytes$EOas_float.java
@@ -27,12 +27,12 @@
  */
 package EOorg.EOeolang;
 
-import java.nio.ByteBuffer;
 import org.eolang.AtComposite;
 import org.eolang.Data;
 import org.eolang.Param;
 import org.eolang.PhDefault;
 import org.eolang.Phi;
+import org.eolang.Versionized;
 import org.eolang.XmirObject;
 
 /**
@@ -41,6 +41,7 @@
  * @since 0.18
  * @checkstyle TypeNameCheck (5 lines)
  */
+@Versionized
 @XmirObject(oname = "bytes.as-float")
 public class EObytes$EOas_float extends PhDefault {
 
diff --git a/eo-runtime/src/main/java/EOorg/EOeolang/EObytes$EOas_int.java b/eo-runtime/src/main/java/EOorg/EOeolang/EObytes$EOas_int.java
index 693af40879..1efadcab3e 100644
--- a/eo-runtime/src/main/java/EOorg/EOeolang/EObytes$EOas_int.java
+++ b/eo-runtime/src/main/java/EOorg/EOeolang/EObytes$EOas_int.java
@@ -32,6 +32,7 @@
 import org.eolang.Param;
 import org.eolang.PhDefault;
 import org.eolang.Phi;
+import org.eolang.Versionized;
 import org.eolang.XmirObject;
 
 /**
@@ -40,6 +41,7 @@
  * @since 0.18
  * @checkstyle TypeNameCheck (5 lines)
  */
+@Versionized
 @XmirObject(oname = "bytes.as-int")
 public class EObytes$EOas_int extends PhDefault {
 
diff --git a/eo-runtime/src/main/java/EOorg/EOeolang/EObytes$EOas_string.java b/eo-runtime/src/main/java/EOorg/EOeolang/EObytes$EOas_string.java
index f56e758abb..c30e6eab5a 100644
--- a/eo-runtime/src/main/java/EOorg/EOeolang/EObytes$EOas_string.java
+++ b/eo-runtime/src/main/java/EOorg/EOeolang/EObytes$EOas_string.java
@@ -33,6 +33,7 @@
 import org.eolang.Param;
 import org.eolang.PhDefault;
 import org.eolang.Phi;
+import org.eolang.Versionized;
 import org.eolang.XmirObject;
 
 /**
@@ -41,6 +42,7 @@
  * @since 0.16
  * @checkstyle TypeNameCheck (5 lines)
  */
+@Versionized
 @XmirObject(oname = "bytes.as-string")
 public class EObytes$EOas_string extends PhDefault {
 
diff --git a/eo-runtime/src/main/java/EOorg/EOeolang/EObytes$EOconcat.java b/eo-runtime/src/main/java/EOorg/EOeolang/EObytes$EOconcat.java
index 30fc659686..2260abb119 100644
--- a/eo-runtime/src/main/java/EOorg/EOeolang/EObytes$EOconcat.java
+++ b/eo-runtime/src/main/java/EOorg/EOeolang/EObytes$EOconcat.java
@@ -33,6 +33,7 @@
 import org.eolang.Param;
 import org.eolang.PhDefault;
 import org.eolang.Phi;
+import org.eolang.Versionized;
 import org.eolang.XmirObject;
 
 /**
@@ -41,6 +42,7 @@
  * @since 0.23
  * @checkstyle TypeNameCheck (5 lines)
  */
+@Versionized
 @XmirObject(oname = "bytes.concat")
 public class EObytes$EOconcat extends PhDefault {
 
diff --git a/eo-runtime/src/main/java/EOorg/EOeolang/EObytes$EOeq.java b/eo-runtime/src/main/java/EOorg/EOeolang/EObytes$EOeq.java
index 8ca31e100e..e08529428d 100644
--- a/eo-runtime/src/main/java/EOorg/EOeolang/EObytes$EOeq.java
+++ b/eo-runtime/src/main/java/EOorg/EOeolang/EObytes$EOeq.java
@@ -36,6 +36,7 @@
 import org.eolang.PhDefault;
 import org.eolang.PhMethod;
 import org.eolang.Phi;
+import org.eolang.Versionized;
 import org.eolang.XmirObject;
 
 /**
@@ -44,6 +45,7 @@
  * @since 1.0
  * @checkstyle TypeNameCheck (5 lines)
  */
+@Versionized
 @XmirObject(oname = "bytes.eq")
 public class EObytes$EOeq extends PhDefault {
 
diff --git a/eo-runtime/src/main/java/EOorg/EOeolang/EObytes$EOnot.java b/eo-runtime/src/main/java/EOorg/EOeolang/EObytes$EOnot.java
index 83e37b8813..2c6df4aa3c 100644
--- a/eo-runtime/src/main/java/EOorg/EOeolang/EObytes$EOnot.java
+++ b/eo-runtime/src/main/java/EOorg/EOeolang/EObytes$EOnot.java
@@ -32,6 +32,7 @@
 import org.eolang.Param;
 import org.eolang.PhDefault;
 import org.eolang.Phi;
+import org.eolang.Versionized;
 import org.eolang.XmirObject;
 
 /**
@@ -40,6 +41,7 @@
  * @since 1.0
  * @checkstyle TypeNameCheck (5 lines)
  */
+@Versionized
 @XmirObject(oname = "bytes.not")
 public class EObytes$EOnot extends PhDefault {
 
diff --git a/eo-runtime/src/main/java/EOorg/EOeolang/EObytes$EOor.java b/eo-runtime/src/main/java/EOorg/EOeolang/EObytes$EOor.java
index 70a71da1b6..090e7d9a71 100644
--- a/eo-runtime/src/main/java/EOorg/EOeolang/EObytes$EOor.java
+++ b/eo-runtime/src/main/java/EOorg/EOeolang/EObytes$EOor.java
@@ -32,6 +32,7 @@
 import org.eolang.Bytes;
 import org.eolang.PhDefault;
 import org.eolang.Phi;
+import org.eolang.Versionized;
 import org.eolang.XmirObject;
 
 /**
@@ -40,6 +41,7 @@
  * @since 1.0
  * @checkstyle TypeNameCheck (15 lines)
  */
+@Versionized
 @XmirObject(oname = "bytes.or")
 public class EObytes$EOor extends PhDefault {
 
diff --git a/eo-runtime/src/main/java/EOorg/EOeolang/EObytes$EOright.java b/eo-runtime/src/main/java/EOorg/EOeolang/EObytes$EOright.java
index 3e05bcf17d..54bed8e011 100644
--- a/eo-runtime/src/main/java/EOorg/EOeolang/EObytes$EOright.java
+++ b/eo-runtime/src/main/java/EOorg/EOeolang/EObytes$EOright.java
@@ -33,6 +33,7 @@
 import org.eolang.Param;
 import org.eolang.PhDefault;
 import org.eolang.Phi;
+import org.eolang.Versionized;
 import org.eolang.XmirObject;
 
 /**
@@ -41,6 +42,7 @@
  * @since 1.0
  * @checkstyle TypeNameCheck (15 lines)
  */
+@Versionized
 @XmirObject(oname = "bytes.right")
 public class EObytes$EOright extends PhDefault {
 
diff --git a/eo-runtime/src/main/java/EOorg/EOeolang/EObytes$EOsize.java b/eo-runtime/src/main/java/EOorg/EOeolang/EObytes$EOsize.java
index 8f31089ba9..db5afdcdeb 100644
--- a/eo-runtime/src/main/java/EOorg/EOeolang/EObytes$EOsize.java
+++ b/eo-runtime/src/main/java/EOorg/EOeolang/EObytes$EOsize.java
@@ -32,6 +32,7 @@
 import org.eolang.Param;
 import org.eolang.PhDefault;
 import org.eolang.Phi;
+import org.eolang.Versionized;
 import org.eolang.XmirObject;
 
 /**
@@ -40,6 +41,7 @@
  * @since 1.0
  * @checkstyle TypeNameCheck (5 lines)
  */
+@Versionized
 @XmirObject(oname = "bytes.size")
 public class EObytes$EOsize extends PhDefault {
 
diff --git a/eo-runtime/src/main/java/EOorg/EOeolang/EObytes$EOslice.java b/eo-runtime/src/main/java/EOorg/EOeolang/EObytes$EOslice.java
index 17d58027ea..836be7f4e6 100644
--- a/eo-runtime/src/main/java/EOorg/EOeolang/EObytes$EOslice.java
+++ b/eo-runtime/src/main/java/EOorg/EOeolang/EObytes$EOslice.java
@@ -34,6 +34,7 @@
 import org.eolang.Param;
 import org.eolang.PhDefault;
 import org.eolang.Phi;
+import org.eolang.Versionized;
 import org.eolang.XmirObject;
 
 /**
@@ -42,6 +43,7 @@
  * @since 1.0
  * @checkstyle TypeNameCheck (5 lines)
  */
+@Versionized
 @XmirObject(oname = "bytes.slice")
 public class EObytes$EOslice extends PhDefault {
 
diff --git a/eo-runtime/src/main/java/EOorg/EOeolang/EObytes$EOxor.java b/eo-runtime/src/main/java/EOorg/EOeolang/EObytes$EOxor.java
index e826b89b89..38ec605227 100644
--- a/eo-runtime/src/main/java/EOorg/EOeolang/EObytes$EOxor.java
+++ b/eo-runtime/src/main/java/EOorg/EOeolang/EObytes$EOxor.java
@@ -32,6 +32,7 @@
 import org.eolang.Bytes;
 import org.eolang.PhDefault;
 import org.eolang.Phi;
+import org.eolang.Versionized;
 import org.eolang.XmirObject;
 
 /**
@@ -40,6 +41,7 @@
  * @since 1.0
  * @checkstyle TypeNameCheck (5 lines)
  */
+@Versionized
 @XmirObject(oname = "bytes.xor")
 public class EObytes$EOxor extends PhDefault {
 
diff --git a/eo-runtime/src/main/java/EOorg/EOeolang/EOcage.java b/eo-runtime/src/main/java/EOorg/EOeolang/EOcage.java
index 0ae3783195..53438f1e16 100644
--- a/eo-runtime/src/main/java/EOorg/EOeolang/EOcage.java
+++ b/eo-runtime/src/main/java/EOorg/EOeolang/EOcage.java
@@ -33,6 +33,7 @@
 import org.eolang.Data;
 import org.eolang.PhDefault;
 import org.eolang.Phi;
+import org.eolang.Versionized;
 import org.eolang.Volatile;
 import org.eolang.XmirObject;
 
@@ -42,6 +43,7 @@
  * @since 0.17
  * @checkstyle TypeNameCheck (5 lines)
  */
+@Versionized
 @Volatile
 @XmirObject(oname = "cage")
 public class EOcage extends PhDefault {
diff --git a/eo-runtime/src/main/java/EOorg/EOeolang/EOerror.java b/eo-runtime/src/main/java/EOorg/EOeolang/EOerror.java
index aa610be790..fae4e6deb4 100644
--- a/eo-runtime/src/main/java/EOorg/EOeolang/EOerror.java
+++ b/eo-runtime/src/main/java/EOorg/EOeolang/EOerror.java
@@ -33,6 +33,7 @@
 import org.eolang.ExFailure;
 import org.eolang.PhDefault;
 import org.eolang.Phi;
+import org.eolang.Versionized;
 import org.eolang.XmirObject;
 
 /**
@@ -46,6 +47,7 @@
  * @since 0.22
  * @checkstyle TypeNameCheck (5 lines)
  */
+@Versionized
 @XmirObject(oname = "error")
 public final class EOerror extends PhDefault {
 
diff --git a/eo-runtime/src/main/java/EOorg/EOeolang/EOfloat$EOas_bytes.java b/eo-runtime/src/main/java/EOorg/EOeolang/EOfloat$EOas_bytes.java
index c31d6bf3f2..7bb11fd359 100644
--- a/eo-runtime/src/main/java/EOorg/EOeolang/EOfloat$EOas_bytes.java
+++ b/eo-runtime/src/main/java/EOorg/EOeolang/EOfloat$EOas_bytes.java
@@ -27,12 +27,12 @@
  */
 package EOorg.EOeolang;
 
-import java.nio.ByteBuffer;
 import org.eolang.AtComposite;
 import org.eolang.Data;
 import org.eolang.Param;
 import org.eolang.PhDefault;
 import org.eolang.Phi;
+import org.eolang.Versionized;
 import org.eolang.XmirObject;
 
 /**
@@ -41,6 +41,7 @@
  * @since 1.0
  * @checkstyle TypeNameCheck (5 lines)
  */
+@Versionized
 @XmirObject(oname = "float.as-bytes")
 public class EOfloat$EOas_bytes extends PhDefault {
 
diff --git a/eo-runtime/src/main/java/EOorg/EOeolang/EOfloat$EOdiv.java b/eo-runtime/src/main/java/EOorg/EOeolang/EOfloat$EOdiv.java
index 0590308a17..7d87640e36 100644
--- a/eo-runtime/src/main/java/EOorg/EOeolang/EOfloat$EOdiv.java
+++ b/eo-runtime/src/main/java/EOorg/EOeolang/EOfloat$EOdiv.java
@@ -32,6 +32,7 @@
 import org.eolang.ExprReduce;
 import org.eolang.PhDefault;
 import org.eolang.Phi;
+import org.eolang.Versionized;
 import org.eolang.XmirObject;
 
 /**
@@ -40,6 +41,7 @@
  * @since 0.23
  * @checkstyle TypeNameCheck (5 lines)
  */
+@Versionized
 @XmirObject(oname = "float.div")
 public class EOfloat$EOdiv extends PhDefault {
 
diff --git a/eo-runtime/src/main/java/EOorg/EOeolang/EOfloat$EOgt.java b/eo-runtime/src/main/java/EOorg/EOeolang/EOfloat$EOgt.java
index 18fa5d6a72..9e8a39b3e7 100644
--- a/eo-runtime/src/main/java/EOorg/EOeolang/EOfloat$EOgt.java
+++ b/eo-runtime/src/main/java/EOorg/EOeolang/EOfloat$EOgt.java
@@ -33,6 +33,7 @@
 import org.eolang.Param;
 import org.eolang.PhDefault;
 import org.eolang.Phi;
+import org.eolang.Versionized;
 import org.eolang.XmirObject;
 
 /**
@@ -41,6 +42,7 @@
  * @since 1.0
  * @checkstyle TypeNameCheck (5 lines)
  */
+@Versionized
 @XmirObject(oname = "float.gt")
 public class EOfloat$EOgt extends PhDefault {
 
diff --git a/eo-runtime/src/main/java/EOorg/EOeolang/EOfloat$EOplus.java b/eo-runtime/src/main/java/EOorg/EOeolang/EOfloat$EOplus.java
index 4af4641504..db81e844b7 100644
--- a/eo-runtime/src/main/java/EOorg/EOeolang/EOfloat$EOplus.java
+++ b/eo-runtime/src/main/java/EOorg/EOeolang/EOfloat$EOplus.java
@@ -32,6 +32,7 @@
 import org.eolang.ExprReduce;
 import org.eolang.PhDefault;
 import org.eolang.Phi;
+import org.eolang.Versionized;
 import org.eolang.XmirObject;
 
 /**
@@ -40,6 +41,7 @@
  * @since 0.23
  * @checkstyle TypeNameCheck (5 lines)
  */
+@Versionized
 @XmirObject(oname = "float.plus")
 public class EOfloat$EOplus extends PhDefault {
 
diff --git a/eo-runtime/src/main/java/EOorg/EOeolang/EOfloat$EOtimes.java b/eo-runtime/src/main/java/EOorg/EOeolang/EOfloat$EOtimes.java
index 6c8a3cec7a..3e7f26be89 100644
--- a/eo-runtime/src/main/java/EOorg/EOeolang/EOfloat$EOtimes.java
+++ b/eo-runtime/src/main/java/EOorg/EOeolang/EOfloat$EOtimes.java
@@ -32,6 +32,7 @@
 import org.eolang.ExprReduce;
 import org.eolang.PhDefault;
 import org.eolang.Phi;
+import org.eolang.Versionized;
 import org.eolang.XmirObject;
 
 /**
@@ -40,6 +41,7 @@
  * @since 1.0
  * @checkstyle TypeNameCheck (5 lines)
  */
+@Versionized
 @XmirObject(oname = "float.times")
 public class EOfloat$EOtimes extends PhDefault {
 
diff --git a/eo-runtime/src/main/java/EOorg/EOeolang/EOgoto.java b/eo-runtime/src/main/java/EOorg/EOeolang/EOgoto.java
index a4fe625d34..c9ac5a53d2 100644
--- a/eo-runtime/src/main/java/EOorg/EOeolang/EOgoto.java
+++ b/eo-runtime/src/main/java/EOorg/EOeolang/EOgoto.java
@@ -29,11 +29,11 @@
 
 import org.eolang.AtComposite;
 import org.eolang.AtFree;
-import org.eolang.Data;
 import org.eolang.Dataized;
 import org.eolang.ExAbstract;
 import org.eolang.PhDefault;
 import org.eolang.Phi;
+import org.eolang.Versionized;
 import org.eolang.XmirObject;
 
 /**
@@ -42,6 +42,7 @@
  * @since 0.17
  * @checkstyle TypeNameCheck (5 lines)
  */
+@Versionized
 @XmirObject(oname = "goto")
 public class EOgoto extends PhDefault {
 
diff --git a/eo-runtime/src/main/java/EOorg/EOeolang/EOheap$EOpointer$EOblock.java b/eo-runtime/src/main/java/EOorg/EOeolang/EOheap$EOpointer$EOblock.java
index 995a39fe26..cc8a60df61 100644
--- a/eo-runtime/src/main/java/EOorg/EOeolang/EOheap$EOpointer$EOblock.java
+++ b/eo-runtime/src/main/java/EOorg/EOeolang/EOheap$EOpointer$EOblock.java
@@ -35,6 +35,7 @@
 import org.eolang.PhDefault;
 import org.eolang.PhWith;
 import org.eolang.Phi;
+import org.eolang.Versionized;
 import org.eolang.XmirObject;
 
 /**
@@ -43,6 +44,7 @@
  * @since 0.19
  * @checkstyle TypeNameCheck (5 lines)
  */
+@Versionized
 @XmirObject(oname = "heap.pointer.block")
 public class EOheap$EOpointer$EOblock extends PhDefault {
 
diff --git a/eo-runtime/src/main/java/EOorg/EOeolang/EOint$EOas_bytes.java b/eo-runtime/src/main/java/EOorg/EOeolang/EOint$EOas_bytes.java
index caee434b3b..37b8d45613 100644
--- a/eo-runtime/src/main/java/EOorg/EOeolang/EOint$EOas_bytes.java
+++ b/eo-runtime/src/main/java/EOorg/EOeolang/EOint$EOas_bytes.java
@@ -27,12 +27,12 @@
  */
 package EOorg.EOeolang;
 
-import java.math.BigInteger;
 import org.eolang.AtComposite;
 import org.eolang.Data;
 import org.eolang.Param;
 import org.eolang.PhDefault;
 import org.eolang.Phi;
+import org.eolang.Versionized;
 import org.eolang.XmirObject;
 
 /**
@@ -41,6 +41,7 @@
  * @since 1.0
  * @checkstyle TypeNameCheck (5 lines)
  */
+@Versionized
 @XmirObject(oname = "int.as-bytes")
 public class EOint$EOas_bytes extends PhDefault {
 
diff --git a/eo-runtime/src/main/java/EOorg/EOeolang/EOint$EOdiv.java b/eo-runtime/src/main/java/EOorg/EOeolang/EOint$EOdiv.java
index 7cfa952484..e2679878b8 100644
--- a/eo-runtime/src/main/java/EOorg/EOeolang/EOint$EOdiv.java
+++ b/eo-runtime/src/main/java/EOorg/EOeolang/EOint$EOdiv.java
@@ -28,15 +28,11 @@
 package EOorg.EOeolang;
 
 import org.eolang.AtComposite;
-import org.eolang.AtFree;
 import org.eolang.AtVararg;
-import org.eolang.Data;
-import org.eolang.Dataized;
 import org.eolang.ExprReduce;
-import org.eolang.Param;
 import org.eolang.PhDefault;
-import org.eolang.PhWith;
 import org.eolang.Phi;
+import org.eolang.Versionized;
 import org.eolang.XmirObject;
 
 /**
@@ -45,6 +41,7 @@
  * @since 1.0
  * @checkstyle TypeNameCheck (5 lines)
  */
+@Versionized
 @XmirObject(oname = "int.div")
 public class EOint$EOdiv extends PhDefault {
 
diff --git a/eo-runtime/src/main/java/EOorg/EOeolang/EOint$EOgt.java b/eo-runtime/src/main/java/EOorg/EOeolang/EOint$EOgt.java
index bc5a65dc4c..b12493df88 100644
--- a/eo-runtime/src/main/java/EOorg/EOeolang/EOint$EOgt.java
+++ b/eo-runtime/src/main/java/EOorg/EOeolang/EOint$EOgt.java
@@ -33,6 +33,7 @@
 import org.eolang.Param;
 import org.eolang.PhDefault;
 import org.eolang.Phi;
+import org.eolang.Versionized;
 import org.eolang.XmirObject;
 
 /**
@@ -41,6 +42,7 @@
  * @since 1.0
  * @checkstyle TypeNameCheck (5 lines)
  */
+@Versionized
 @XmirObject(oname = "int.gt")
 public class EOint$EOgt extends PhDefault {
 
diff --git a/eo-runtime/src/main/java/EOorg/EOeolang/EOint$EOplus.java b/eo-runtime/src/main/java/EOorg/EOeolang/EOint$EOplus.java
index c16dc0230a..ff89e40bad 100644
--- a/eo-runtime/src/main/java/EOorg/EOeolang/EOint$EOplus.java
+++ b/eo-runtime/src/main/java/EOorg/EOeolang/EOint$EOplus.java
@@ -29,13 +29,10 @@
 
 import org.eolang.AtComposite;
 import org.eolang.AtVararg;
-import org.eolang.Data;
-import org.eolang.Dataized;
 import org.eolang.ExprReduce;
-import org.eolang.Param;
 import org.eolang.PhDefault;
-import org.eolang.PhWith;
 import org.eolang.Phi;
+import org.eolang.Versionized;
 import org.eolang.XmirObject;
 
 /**
@@ -44,6 +41,7 @@
  * @since 0.23
  * @checkstyle TypeNameCheck (5 lines)
  */
+@Versionized
 @XmirObject(oname = "int.plus")
 public class EOint$EOplus extends PhDefault {
 
diff --git a/eo-runtime/src/main/java/EOorg/EOeolang/EOint$EOtimes.java b/eo-runtime/src/main/java/EOorg/EOeolang/EOint$EOtimes.java
index d1d3715969..da7253c252 100644
--- a/eo-runtime/src/main/java/EOorg/EOeolang/EOint$EOtimes.java
+++ b/eo-runtime/src/main/java/EOorg/EOeolang/EOint$EOtimes.java
@@ -32,6 +32,7 @@
 import org.eolang.ExprReduce;
 import org.eolang.PhDefault;
 import org.eolang.Phi;
+import org.eolang.Versionized;
 import org.eolang.XmirObject;
 
 /**
@@ -40,6 +41,7 @@
  * @since 1.0
  * @checkstyle TypeNameCheck (5 lines)
  */
+@Versionized
 @XmirObject(oname = "int.times")
 public class EOint$EOtimes extends PhDefault {
 
diff --git a/eo-runtime/src/main/java/EOorg/EOeolang/EOio/EOstdin$EOnext_line.java b/eo-runtime/src/main/java/EOorg/EOeolang/EOio/EOstdin$EOnext_line.java
index a4ad0a4988..abb3208400 100644
--- a/eo-runtime/src/main/java/EOorg/EOeolang/EOio/EOstdin$EOnext_line.java
+++ b/eo-runtime/src/main/java/EOorg/EOeolang/EOio/EOstdin$EOnext_line.java
@@ -33,6 +33,7 @@
 import org.eolang.ExFailure;
 import org.eolang.PhDefault;
 import org.eolang.Phi;
+import org.eolang.Versionized;
 
 /**
  * Standard Input. Consumes only one line.
@@ -40,6 +41,7 @@
  * @since 0.23
  * @checkstyle TypeNameCheck (5 lines)
  */
+@Versionized
 public class EOstdin$EOnext_line extends PhDefault {
     /**
      * Ctor.
diff --git "a/eo-runtime/src/main/java/EOorg/EOeolang/EOio/EOstdin$EO\317\206.java" "b/eo-runtime/src/main/java/EOorg/EOeolang/EOio/EOstdin$EO\317\206.java"
index aed1f52eb6..7f03404a7c 100644
--- "a/eo-runtime/src/main/java/EOorg/EOeolang/EOio/EOstdin$EO\317\206.java"
+++ "b/eo-runtime/src/main/java/EOorg/EOeolang/EOio/EOstdin$EO\317\206.java"
@@ -31,6 +31,7 @@
 import org.eolang.Data;
 import org.eolang.PhDefault;
 import org.eolang.Phi;
+import org.eolang.Versionized;
 
 /**
  * Standard Input. Consumes all data.
@@ -38,6 +39,7 @@
  * @since 0.23
  * @checkstyle TypeNameCheck (5 lines)
  */
+@Versionized
 public class EOstdin$EOφ extends PhDefault {
     /**
      * Ctor.
diff --git a/eo-runtime/src/main/java/EOorg/EOeolang/EOio/EOstdout.java b/eo-runtime/src/main/java/EOorg/EOeolang/EOio/EOstdout.java
index 79ad77080f..c0ca6597ac 100644
--- a/eo-runtime/src/main/java/EOorg/EOeolang/EOio/EOstdout.java
+++ b/eo-runtime/src/main/java/EOorg/EOeolang/EOio/EOstdout.java
@@ -34,6 +34,7 @@
 import org.eolang.Param;
 import org.eolang.PhDefault;
 import org.eolang.Phi;
+import org.eolang.Versionized;
 import org.eolang.XmirObject;
 
 /**
@@ -42,6 +43,7 @@
  * @since 0.1
  * @checkstyle TypeNameCheck (5 lines)
  */
+@Versionized
 @XmirObject(oname = "stdout")
 public class EOstdout extends PhDefault {
     /**
diff --git a/eo-runtime/src/main/java/EOorg/EOeolang/EOio/Input.java b/eo-runtime/src/main/java/EOorg/EOeolang/EOio/Input.java
index e92e36713c..c4f0685c6c 100644
--- a/eo-runtime/src/main/java/EOorg/EOeolang/EOio/Input.java
+++ b/eo-runtime/src/main/java/EOorg/EOeolang/EOio/Input.java
@@ -31,12 +31,14 @@
 package EOorg.EOeolang.EOio;
 
 import java.util.Scanner;
+import org.eolang.Versionized;
 
 /**
  * All system inputs.
  *
  * @since 0.28.0
  */
+@Versionized
 public final class Input {
     /**
      * Default input.
diff --git a/eo-runtime/src/main/java/EOorg/EOeolang/EOmemory.java b/eo-runtime/src/main/java/EOorg/EOeolang/EOmemory.java
index ee51926190..792420a144 100644
--- a/eo-runtime/src/main/java/EOorg/EOeolang/EOmemory.java
+++ b/eo-runtime/src/main/java/EOorg/EOeolang/EOmemory.java
@@ -32,6 +32,7 @@
 import org.eolang.Attr;
 import org.eolang.PhDefault;
 import org.eolang.Phi;
+import org.eolang.Versionized;
 import org.eolang.XmirObject;
 
 /**
@@ -40,6 +41,7 @@
  * @since 1.0
  * @checkstyle TypeNameCheck (5 lines)
  */
+@Versionized
 @XmirObject(oname = "memory")
 public class EOmemory extends PhDefault {
 
diff --git a/eo-runtime/src/main/java/EOorg/EOeolang/EOram$EOram_slice$EOwrite.java b/eo-runtime/src/main/java/EOorg/EOeolang/EOram$EOram_slice$EOwrite.java
index 060ed1a02c..d9e3359f8e 100644
--- a/eo-runtime/src/main/java/EOorg/EOeolang/EOram$EOram_slice$EOwrite.java
+++ b/eo-runtime/src/main/java/EOorg/EOeolang/EOram$EOram_slice$EOwrite.java
@@ -33,12 +33,14 @@
 import org.eolang.Param;
 import org.eolang.PhDefault;
 import org.eolang.Phi;
+import org.eolang.Versionized;
 
 /**
  * Write bytes to memory from position, according to the ram.slice object.
  * @since 0.1
  * @checkstyle TypeNameCheck (5 lines)
  */
+@Versionized
 public class EOram$EOram_slice$EOwrite extends PhDefault {
     /**
      * Ctor.
diff --git "a/eo-runtime/src/main/java/EOorg/EOeolang/EOram$EOram_slice$EO\317\206.java" "b/eo-runtime/src/main/java/EOorg/EOeolang/EOram$EOram_slice$EO\317\206.java"
index e8a918fdbc..32d2fa3923 100644
--- "a/eo-runtime/src/main/java/EOorg/EOeolang/EOram$EOram_slice$EO\317\206.java"
+++ "b/eo-runtime/src/main/java/EOorg/EOeolang/EOram$EOram_slice$EO\317\206.java"
@@ -32,12 +32,14 @@
 import org.eolang.Param;
 import org.eolang.PhDefault;
 import org.eolang.Phi;
+import org.eolang.Versionized;
 
 /**
  * Read from memory.
  * @since 0.25
  * @checkstyle TypeNameCheck (5 lines)
  */
+@Versionized
 public class EOram$EOram_slice$EOφ extends PhDefault {
     /**
      * Ctor.
diff --git a/eo-runtime/src/main/java/EOorg/EOeolang/EOram$EOslice.java b/eo-runtime/src/main/java/EOorg/EOeolang/EOram$EOslice.java
index 75e12b4b00..dece50b96f 100644
--- a/eo-runtime/src/main/java/EOorg/EOeolang/EOram$EOslice.java
+++ b/eo-runtime/src/main/java/EOorg/EOeolang/EOram$EOslice.java
@@ -34,6 +34,7 @@
 import org.eolang.PhDefault;
 import org.eolang.PhWith;
 import org.eolang.Phi;
+import org.eolang.Versionized;
 import org.eolang.XmirObject;
 
 /**
@@ -41,6 +42,7 @@
  * @since 0.25
  * @checkstyle TypeNameCheck (5 lines)
  */
+@Versionized
 @XmirObject(oname = "ram.slice")
 public class EOram$EOslice extends PhDefault {
     /**
diff --git a/eo-runtime/src/main/java/EOorg/EOeolang/EOram$EOwrite.java b/eo-runtime/src/main/java/EOorg/EOeolang/EOram$EOwrite.java
index 07ec518ab1..39cbe36459 100644
--- a/eo-runtime/src/main/java/EOorg/EOeolang/EOram$EOwrite.java
+++ b/eo-runtime/src/main/java/EOorg/EOeolang/EOram$EOwrite.java
@@ -33,6 +33,7 @@
 import org.eolang.Param;
 import org.eolang.PhDefault;
 import org.eolang.Phi;
+import org.eolang.Versionized;
 import org.eolang.XmirObject;
 
 /**
@@ -40,6 +41,7 @@
  * @since 0.1
  * @checkstyle TypeNameCheck (5 lines)
  */
+@Versionized
 @XmirObject(oname = "ram.write")
 public class EOram$EOwrite extends PhDefault {
     /**
diff --git a/eo-runtime/src/main/java/EOorg/EOeolang/EOrust.java b/eo-runtime/src/main/java/EOorg/EOeolang/EOrust.java
index cab652a3a4..5b26e8c28e 100644
--- a/eo-runtime/src/main/java/EOorg/EOeolang/EOrust.java
+++ b/eo-runtime/src/main/java/EOorg/EOeolang/EOrust.java
@@ -58,6 +58,7 @@
 import org.eolang.Universe;
 import org.eolang.UniverseDefault;
 import org.eolang.UniverseSafe;
+import org.eolang.Versionized;
 import org.eolang.XmirObject;
 
 /**
@@ -68,6 +69,7 @@
  * @checkstyle LineLengthCheck (100 lines)
  * @checkstyle TypeNameCheck (5 lines)
  */
+@Versionized
 @XmirObject(oname = "rust")
 public class EOrust extends PhDefault {
 
diff --git a/eo-runtime/src/main/java/EOorg/EOeolang/EOseq.java b/eo-runtime/src/main/java/EOorg/EOeolang/EOseq.java
index af008c611b..f6a969048c 100644
--- a/eo-runtime/src/main/java/EOorg/EOeolang/EOseq.java
+++ b/eo-runtime/src/main/java/EOorg/EOeolang/EOseq.java
@@ -33,6 +33,7 @@
 import org.eolang.Dataized;
 import org.eolang.PhDefault;
 import org.eolang.Phi;
+import org.eolang.Versionized;
 import org.eolang.XmirObject;
 
 /**
@@ -41,6 +42,7 @@
  * @since 1.0
  * @checkstyle TypeNameCheck (5 lines)
  */
+@Versionized
 @XmirObject(oname = "seq")
 public class EOseq extends PhDefault {
 
diff --git a/eo-runtime/src/main/java/EOorg/EOeolang/EOstring$EOas_bytes.java b/eo-runtime/src/main/java/EOorg/EOeolang/EOstring$EOas_bytes.java
index f236ff5071..cf4bfc845e 100644
--- a/eo-runtime/src/main/java/EOorg/EOeolang/EOstring$EOas_bytes.java
+++ b/eo-runtime/src/main/java/EOorg/EOeolang/EOstring$EOas_bytes.java
@@ -33,6 +33,7 @@
 import org.eolang.Param;
 import org.eolang.PhDefault;
 import org.eolang.Phi;
+import org.eolang.Versionized;
 import org.eolang.XmirObject;
 
 /**
@@ -41,6 +42,7 @@
  * @since 1.0
  * @checkstyle TypeNameCheck (5 lines)
  */
+@Versionized
 @XmirObject(oname = "string.as-bytes")
 public class EOstring$EOas_bytes extends PhDefault {
 
diff --git a/eo-runtime/src/main/java/EOorg/EOeolang/EOstring$EOlength.java b/eo-runtime/src/main/java/EOorg/EOeolang/EOstring$EOlength.java
index 92f458ebf6..bc3d726e42 100644
--- a/eo-runtime/src/main/java/EOorg/EOeolang/EOstring$EOlength.java
+++ b/eo-runtime/src/main/java/EOorg/EOeolang/EOstring$EOlength.java
@@ -32,6 +32,7 @@
 import org.eolang.Param;
 import org.eolang.PhDefault;
 import org.eolang.Phi;
+import org.eolang.Versionized;
 import org.eolang.XmirObject;
 
 /**
@@ -40,6 +41,7 @@
  * @since 1.0
  * @checkstyle TypeNameCheck (5 lines)
  */
+@Versionized
 @XmirObject(oname = "string.length")
 public class EOstring$EOlength extends PhDefault {
 
diff --git a/eo-runtime/src/main/java/EOorg/EOeolang/EOstring$EOslice.java b/eo-runtime/src/main/java/EOorg/EOeolang/EOstring$EOslice.java
index 9994309a67..6c25ecbdb7 100644
--- a/eo-runtime/src/main/java/EOorg/EOeolang/EOstring$EOslice.java
+++ b/eo-runtime/src/main/java/EOorg/EOeolang/EOstring$EOslice.java
@@ -34,6 +34,7 @@
 import org.eolang.Param;
 import org.eolang.PhDefault;
 import org.eolang.Phi;
+import org.eolang.Versionized;
 import org.eolang.XmirObject;
 
 /**
@@ -42,6 +43,7 @@
  * @since 0.23
  * @checkstyle TypeNameCheck (5 lines)
  */
+@Versionized
 @XmirObject(oname = "string.slice")
 public class EOstring$EOslice extends PhDefault {
 
diff --git a/eo-runtime/src/main/java/EOorg/EOeolang/EOtry.java b/eo-runtime/src/main/java/EOorg/EOeolang/EOtry.java
index a17616152a..b1e975a1ba 100644
--- a/eo-runtime/src/main/java/EOorg/EOeolang/EOtry.java
+++ b/eo-runtime/src/main/java/EOorg/EOeolang/EOtry.java
@@ -29,10 +29,10 @@
 
 import org.eolang.AtComposite;
 import org.eolang.AtFree;
-import org.eolang.Data;
 import org.eolang.Dataized;
 import org.eolang.PhDefault;
 import org.eolang.Phi;
+import org.eolang.Versionized;
 import org.eolang.XmirObject;
 
 /**
@@ -41,6 +41,7 @@
  * @since 0.19
  * @checkstyle TypeNameCheck (5 lines)
  */
+@Versionized
 @XmirObject(oname = "try")
 public class EOtry extends PhDefault {
 
diff --git a/eo-runtime/src/main/java/EOorg/EOeolang/EOtuple$EOat.java b/eo-runtime/src/main/java/EOorg/EOeolang/EOtuple$EOat.java
index c40a600173..63cee9a12d 100644
--- a/eo-runtime/src/main/java/EOorg/EOeolang/EOtuple$EOat.java
+++ b/eo-runtime/src/main/java/EOorg/EOeolang/EOtuple$EOat.java
@@ -33,6 +33,7 @@
 import org.eolang.Param;
 import org.eolang.PhDefault;
 import org.eolang.Phi;
+import org.eolang.Versionized;
 import org.eolang.XmirObject;
 
 /**
@@ -41,6 +42,7 @@
  * @since 1.0
  * @checkstyle TypeNameCheck (5 lines)
  */
+@Versionized
 @XmirObject(oname = "tuple.at")
 public class EOtuple$EOat extends PhDefault {
 
diff --git a/eo-runtime/src/main/java/EOorg/EOeolang/EOtuple$EOlength.java b/eo-runtime/src/main/java/EOorg/EOeolang/EOtuple$EOlength.java
index 065a663a6e..83c7c3dbdc 100644
--- a/eo-runtime/src/main/java/EOorg/EOeolang/EOtuple$EOlength.java
+++ b/eo-runtime/src/main/java/EOorg/EOeolang/EOtuple$EOlength.java
@@ -32,6 +32,7 @@
 import org.eolang.Param;
 import org.eolang.PhDefault;
 import org.eolang.Phi;
+import org.eolang.Versionized;
 import org.eolang.XmirObject;
 
 /**
@@ -40,6 +41,7 @@
  * @since 1.0
  * @checkstyle TypeNameCheck (5 lines)
  */
+@Versionized
 @XmirObject(oname = "tuple.length")
 public class EOtuple$EOlength extends PhDefault {
 
diff --git a/eo-runtime/src/main/java/EOorg/EOeolang/EOtuple$EOwith.java b/eo-runtime/src/main/java/EOorg/EOeolang/EOtuple$EOwith.java
index c4f0356479..5f3a5ca598 100644
--- a/eo-runtime/src/main/java/EOorg/EOeolang/EOtuple$EOwith.java
+++ b/eo-runtime/src/main/java/EOorg/EOeolang/EOtuple$EOwith.java
@@ -33,6 +33,7 @@
 import org.eolang.Param;
 import org.eolang.PhDefault;
 import org.eolang.Phi;
+import org.eolang.Versionized;
 import org.eolang.XmirObject;
 
 /**
@@ -41,6 +42,7 @@
  * @since 1.0
  * @checkstyle TypeNameCheck (5 lines)
  */
+@Versionized
 @XmirObject(oname = "tuple.with")
 public class EOtuple$EOwith extends PhDefault {
 
diff --git a/eo-runtime/src/main/java/EOorg/EOeolang/ExReduceBytes.java b/eo-runtime/src/main/java/EOorg/EOeolang/ExReduceBytes.java
index 7d96815641..f582644f8f 100644
--- a/eo-runtime/src/main/java/EOorg/EOeolang/ExReduceBytes.java
+++ b/eo-runtime/src/main/java/EOorg/EOeolang/ExReduceBytes.java
@@ -34,12 +34,14 @@
 import org.eolang.Expr;
 import org.eolang.Param;
 import org.eolang.Phi;
+import org.eolang.Versionized;
 
 /**
  * Reduce on BYTES.
  *
  * @since 1.0
  */
+@Versionized
 final class ExReduceBytes implements Expr {
     /**
      * Reduce operation.
diff --git a/eo-runtime/src/main/java/EOorg/EOeolang/Heaps.java b/eo-runtime/src/main/java/EOorg/EOeolang/Heaps.java
index da873c3c2e..689a0f1cd2 100644
--- a/eo-runtime/src/main/java/EOorg/EOeolang/Heaps.java
+++ b/eo-runtime/src/main/java/EOorg/EOeolang/Heaps.java
@@ -30,12 +30,14 @@
 import java.util.concurrent.ConcurrentHashMap;
 import org.eolang.Dataized;
 import org.eolang.Phi;
+import org.eolang.Versionized;
 
 /**
  * All heaps.
  *
  * @since 0.19
  */
+@Versionized
 final class Heaps {
 
     /**
diff --git a/eo-runtime/src/main/java/EOorg/EOeolang/Ram.java b/eo-runtime/src/main/java/EOorg/EOeolang/Ram.java
index 1074954ef7..9f6e1a0eed 100644
--- a/eo-runtime/src/main/java/EOorg/EOeolang/Ram.java
+++ b/eo-runtime/src/main/java/EOorg/EOeolang/Ram.java
@@ -36,12 +36,14 @@
 import java.util.concurrent.ConcurrentHashMap;
 import org.eolang.Dataized;
 import org.eolang.Phi;
+import org.eolang.Versionized;
 
 /**
  * Random access.
  *
  * @since 0.19
  */
+@Versionized
 public enum Ram {
     /**
      * Ram instance.
diff --git a/eo-runtime/src/main/java/org/eolang/AtAbsent.java b/eo-runtime/src/main/java/org/eolang/AtAbsent.java
index 2ab37d717a..186a8d91f4 100644
--- a/eo-runtime/src/main/java/org/eolang/AtAbsent.java
+++ b/eo-runtime/src/main/java/org/eolang/AtAbsent.java
@@ -33,6 +33,7 @@
  *
  * @since 0.1
  */
+@Versionized
 final class AtAbsent implements Attr {
 
     /**
diff --git a/eo-runtime/src/main/java/org/eolang/AtCage.java b/eo-runtime/src/main/java/org/eolang/AtCage.java
index 34d79a8220..a00e38b844 100644
--- a/eo-runtime/src/main/java/org/eolang/AtCage.java
+++ b/eo-runtime/src/main/java/org/eolang/AtCage.java
@@ -34,6 +34,7 @@
  *
  * @since 0.29.6
  */
+@Versionized
 public final class AtCage implements Attr {
 
     /**
diff --git a/eo-runtime/src/main/java/org/eolang/AtComposite.java b/eo-runtime/src/main/java/org/eolang/AtComposite.java
index d881d7abdb..d43677ebc3 100644
--- a/eo-runtime/src/main/java/org/eolang/AtComposite.java
+++ b/eo-runtime/src/main/java/org/eolang/AtComposite.java
@@ -30,6 +30,7 @@
  *
  * @since 0.1
  */
+@Versionized
 public final class AtComposite implements Attr {
 
     /**
diff --git a/eo-runtime/src/main/java/org/eolang/AtConst.java b/eo-runtime/src/main/java/org/eolang/AtConst.java
index d9a3b55852..334278f4bd 100644
--- a/eo-runtime/src/main/java/org/eolang/AtConst.java
+++ b/eo-runtime/src/main/java/org/eolang/AtConst.java
@@ -35,6 +35,7 @@
  * @todo #1614:30min This class don't have enough tests. We need to add more, at least for
  *  the next methods: toString(), φTerm(), copy(), put().
  */
+@Versionized
 final class AtConst implements Attr {
 
     /**
diff --git a/eo-runtime/src/main/java/org/eolang/AtFixed.java b/eo-runtime/src/main/java/org/eolang/AtFixed.java
index 73a51f1cf3..2f2e46297a 100644
--- a/eo-runtime/src/main/java/org/eolang/AtFixed.java
+++ b/eo-runtime/src/main/java/org/eolang/AtFixed.java
@@ -29,6 +29,7 @@
  *
  * @since 0.1
  */
+@Versionized
 final class AtFixed implements Attr {
 
     /**
diff --git a/eo-runtime/src/main/java/org/eolang/AtFree.java b/eo-runtime/src/main/java/org/eolang/AtFree.java
index 3ec11e9143..284213b2e9 100644
--- a/eo-runtime/src/main/java/org/eolang/AtFree.java
+++ b/eo-runtime/src/main/java/org/eolang/AtFree.java
@@ -34,6 +34,7 @@
  *
  * @since 0.1
  */
+@Versionized
 public final class AtFree implements Attr {
     /**
      * Origin.
diff --git a/eo-runtime/src/main/java/org/eolang/AtLocated.java b/eo-runtime/src/main/java/org/eolang/AtLocated.java
index 7e01c367d7..f6cff81fe3 100644
--- a/eo-runtime/src/main/java/org/eolang/AtLocated.java
+++ b/eo-runtime/src/main/java/org/eolang/AtLocated.java
@@ -29,6 +29,7 @@
  *
  * @since 0.21
  */
+@Versionized
 final class AtLocated implements Attr {
 
     /**
diff --git a/eo-runtime/src/main/java/org/eolang/AtLogged.java b/eo-runtime/src/main/java/org/eolang/AtLogged.java
index 7988af9fe7..971b6182cb 100644
--- a/eo-runtime/src/main/java/org/eolang/AtLogged.java
+++ b/eo-runtime/src/main/java/org/eolang/AtLogged.java
@@ -32,6 +32,7 @@
  *
  * @since 0.24
  */
+@Versionized
 final class AtLogged implements Attr {
 
     /**
diff --git a/eo-runtime/src/main/java/org/eolang/AtNamed.java b/eo-runtime/src/main/java/org/eolang/AtNamed.java
index 27733318b6..384b828e36 100644
--- a/eo-runtime/src/main/java/org/eolang/AtNamed.java
+++ b/eo-runtime/src/main/java/org/eolang/AtNamed.java
@@ -29,6 +29,7 @@
  *
  * @since 0.1
  */
+@Versionized
 final class AtNamed implements Attr {
 
     /**
diff --git a/eo-runtime/src/main/java/org/eolang/AtOnce.java b/eo-runtime/src/main/java/org/eolang/AtOnce.java
index 8763d691ca..56d241b566 100644
--- a/eo-runtime/src/main/java/org/eolang/AtOnce.java
+++ b/eo-runtime/src/main/java/org/eolang/AtOnce.java
@@ -31,6 +31,7 @@
  *
  * @since 0.1
  */
+@Versionized
 public final class AtOnce implements Attr {
 
     /**
diff --git a/eo-runtime/src/main/java/org/eolang/AtPhiSensitive.java b/eo-runtime/src/main/java/org/eolang/AtPhiSensitive.java
index df5f3105f2..6f1367dcde 100644
--- a/eo-runtime/src/main/java/org/eolang/AtPhiSensitive.java
+++ b/eo-runtime/src/main/java/org/eolang/AtPhiSensitive.java
@@ -31,6 +31,7 @@
  *
  * @since 0.22
  */
+@Versionized
 final class AtPhiSensitive implements Attr {
 
     /**
diff --git a/eo-runtime/src/main/java/org/eolang/AtSafe.java b/eo-runtime/src/main/java/org/eolang/AtSafe.java
index f9d4ecfb47..4baa708863 100644
--- a/eo-runtime/src/main/java/org/eolang/AtSafe.java
+++ b/eo-runtime/src/main/java/org/eolang/AtSafe.java
@@ -32,6 +32,7 @@
  *
  * @since 0.26
  */
+@Versionized
 public final class AtSafe implements Attr {
 
     /**
diff --git a/eo-runtime/src/main/java/org/eolang/AtSimple.java b/eo-runtime/src/main/java/org/eolang/AtSimple.java
index 7187462d31..4cbe62c3f3 100644
--- a/eo-runtime/src/main/java/org/eolang/AtSimple.java
+++ b/eo-runtime/src/main/java/org/eolang/AtSimple.java
@@ -31,6 +31,7 @@
  *
  * @since 0.1
  */
+@Versionized
 public final class AtSimple implements Attr {
 
     /**
diff --git a/eo-runtime/src/main/java/org/eolang/AtVararg.java b/eo-runtime/src/main/java/org/eolang/AtVararg.java
index db3760a91e..360a9c44b8 100644
--- a/eo-runtime/src/main/java/org/eolang/AtVararg.java
+++ b/eo-runtime/src/main/java/org/eolang/AtVararg.java
@@ -33,6 +33,7 @@
  *
  * @since 0.1
  */
+@Versionized
 public final class AtVararg implements Attr {
 
     /**
diff --git a/eo-runtime/src/main/java/org/eolang/Attr.java b/eo-runtime/src/main/java/org/eolang/Attr.java
index 342e659dcf..dc47827261 100644
--- a/eo-runtime/src/main/java/org/eolang/Attr.java
+++ b/eo-runtime/src/main/java/org/eolang/Attr.java
@@ -29,6 +29,7 @@
  *
  * @since 0.1
  */
+@Versionized
 public interface Attr extends Term {
 
     /**
diff --git a/eo-runtime/src/main/java/org/eolang/Bytes.java b/eo-runtime/src/main/java/org/eolang/Bytes.java
index 445c1ed3d2..e396853f65 100644
--- a/eo-runtime/src/main/java/org/eolang/Bytes.java
+++ b/eo-runtime/src/main/java/org/eolang/Bytes.java
@@ -34,6 +34,7 @@
  *
  * @since 1.0
  */
+@Versionized
 public interface Bytes extends Data<byte[]> {
     /**
      * NOT operation.
diff --git a/eo-runtime/src/main/java/org/eolang/BytesOf.java b/eo-runtime/src/main/java/org/eolang/BytesOf.java
index 8b96db6bca..25833ea7c0 100644
--- a/eo-runtime/src/main/java/org/eolang/BytesOf.java
+++ b/eo-runtime/src/main/java/org/eolang/BytesOf.java
@@ -32,6 +32,7 @@
  *
  * @since 1.0
  */
+@Versionized
 public final class BytesOf implements Bytes {
 
     /**
diff --git a/eo-runtime/src/main/java/org/eolang/CachedPhi.java b/eo-runtime/src/main/java/org/eolang/CachedPhi.java
index 867a735364..91373b9b89 100644
--- a/eo-runtime/src/main/java/org/eolang/CachedPhi.java
+++ b/eo-runtime/src/main/java/org/eolang/CachedPhi.java
@@ -34,6 +34,7 @@
  *
  * @since 0.17
  */
+@Versionized
 final class CachedPhi {
 
     /**
diff --git a/eo-runtime/src/main/java/org/eolang/Data.java b/eo-runtime/src/main/java/org/eolang/Data.java
index 650912e31a..3b604fb411 100644
--- a/eo-runtime/src/main/java/org/eolang/Data.java
+++ b/eo-runtime/src/main/java/org/eolang/Data.java
@@ -39,6 +39,7 @@
  * @param <T> Data type.
  * @since 0.1
  */
+@Versionized
 public interface Data<T> {
 
     /**
diff --git a/eo-runtime/src/main/java/org/eolang/Dataized.java b/eo-runtime/src/main/java/org/eolang/Dataized.java
index 6270203a00..40aea13de9 100644
--- a/eo-runtime/src/main/java/org/eolang/Dataized.java
+++ b/eo-runtime/src/main/java/org/eolang/Dataized.java
@@ -43,6 +43,7 @@
  * @see <a href="https://arxiv.org/abs/2111.13384">Canonical explanation of the Dataization concept</a>
  * @since 0.1
  */
+@Versionized
 public final class Dataized {
 
     /**
diff --git a/eo-runtime/src/main/java/org/eolang/ExAbstract.java b/eo-runtime/src/main/java/org/eolang/ExAbstract.java
index 027ac1bb81..ef1d1ea604 100644
--- a/eo-runtime/src/main/java/org/eolang/ExAbstract.java
+++ b/eo-runtime/src/main/java/org/eolang/ExAbstract.java
@@ -32,6 +32,7 @@
 
  * @since 0.21
  */
+@Versionized
 public abstract class ExAbstract extends RuntimeException {
 
     /**
diff --git a/eo-runtime/src/main/java/org/eolang/ExFailure.java b/eo-runtime/src/main/java/org/eolang/ExFailure.java
index 255b6e65e1..903ec5699b 100644
--- a/eo-runtime/src/main/java/org/eolang/ExFailure.java
+++ b/eo-runtime/src/main/java/org/eolang/ExFailure.java
@@ -29,6 +29,7 @@
  *
  * @since 0.21
  */
+@Versionized
 public class ExFailure extends ExAbstract {
 
     /**
diff --git a/eo-runtime/src/main/java/org/eolang/ExFlow.java b/eo-runtime/src/main/java/org/eolang/ExFlow.java
index d896ebdfbb..75c380bb81 100644
--- a/eo-runtime/src/main/java/org/eolang/ExFlow.java
+++ b/eo-runtime/src/main/java/org/eolang/ExFlow.java
@@ -32,6 +32,7 @@
  *
  * @since 0.21
  */
+@Versionized
 public final class ExFlow extends ExAbstract {
 
     /**
diff --git a/eo-runtime/src/main/java/org/eolang/ExInterrupted.java b/eo-runtime/src/main/java/org/eolang/ExInterrupted.java
index a79d832221..f393cc955a 100644
--- a/eo-runtime/src/main/java/org/eolang/ExInterrupted.java
+++ b/eo-runtime/src/main/java/org/eolang/ExInterrupted.java
@@ -29,6 +29,7 @@
  *
  * @since 0.28.3
  */
+@Versionized
 public class ExInterrupted extends ExAbstract {
     /**
      * Serialization identifier.
diff --git a/eo-runtime/src/main/java/org/eolang/ExNative.java b/eo-runtime/src/main/java/org/eolang/ExNative.java
index 9aba1a2212..e8096d822a 100644
--- a/eo-runtime/src/main/java/org/eolang/ExNative.java
+++ b/eo-runtime/src/main/java/org/eolang/ExNative.java
@@ -29,6 +29,7 @@
  *
  * @since 0.32
  */
+@Versionized
 public final class ExNative extends ExFailure {
 
     private static final long serialVersionUID = 5726845593921315515L;
diff --git a/eo-runtime/src/main/java/org/eolang/ExReadOnly.java b/eo-runtime/src/main/java/org/eolang/ExReadOnly.java
index 2dfda037b9..7ba4df1e8e 100644
--- a/eo-runtime/src/main/java/org/eolang/ExReadOnly.java
+++ b/eo-runtime/src/main/java/org/eolang/ExReadOnly.java
@@ -30,6 +30,7 @@
  *
  * @since 0.21
  */
+@Versionized
 public final class ExReadOnly extends ExAbstract {
 
     /**
diff --git a/eo-runtime/src/main/java/org/eolang/ExUnset.java b/eo-runtime/src/main/java/org/eolang/ExUnset.java
index 90db429137..f415e96adc 100644
--- a/eo-runtime/src/main/java/org/eolang/ExUnset.java
+++ b/eo-runtime/src/main/java/org/eolang/ExUnset.java
@@ -30,6 +30,7 @@
  *
  * @since 0.21
  */
+@Versionized
 public final class ExUnset extends ExAbstract {
 
     /**
diff --git a/eo-runtime/src/main/java/org/eolang/Expr.java b/eo-runtime/src/main/java/org/eolang/Expr.java
index 61225e5519..959b11f0ab 100644
--- a/eo-runtime/src/main/java/org/eolang/Expr.java
+++ b/eo-runtime/src/main/java/org/eolang/Expr.java
@@ -29,6 +29,7 @@
  *
  * @since 0.1
  */
+@Versionized
 public interface Expr {
 
     /**
diff --git a/eo-runtime/src/main/java/org/eolang/ExprReduce.java b/eo-runtime/src/main/java/org/eolang/ExprReduce.java
index be7fd20a37..c5996673ea 100644
--- a/eo-runtime/src/main/java/org/eolang/ExprReduce.java
+++ b/eo-runtime/src/main/java/org/eolang/ExprReduce.java
@@ -46,6 +46,7 @@
  * @param <T> Type of arguments that are going to be reduced
  * @since 1.0
  */
+@Versionized
 public final class ExprReduce<T> implements Expr {
 
     /**
diff --git a/eo-runtime/src/main/java/org/eolang/Indented.java b/eo-runtime/src/main/java/org/eolang/Indented.java
index 3b15cf12f8..d03302c2ab 100644
--- a/eo-runtime/src/main/java/org/eolang/Indented.java
+++ b/eo-runtime/src/main/java/org/eolang/Indented.java
@@ -30,6 +30,7 @@
  *
  * @since 0.1
  */
+@Versionized
 final class Indented {
 
     /**
diff --git a/eo-runtime/src/main/java/org/eolang/JavaPath.java b/eo-runtime/src/main/java/org/eolang/JavaPath.java
index 59cb64ec7e..a8ff29dc99 100644
--- a/eo-runtime/src/main/java/org/eolang/JavaPath.java
+++ b/eo-runtime/src/main/java/org/eolang/JavaPath.java
@@ -34,6 +34,7 @@
  *
  * @since 0.29
  */
+@Versionized
 final class JavaPath {
 
     /**
diff --git a/eo-runtime/src/main/java/org/eolang/Main.java b/eo-runtime/src/main/java/org/eolang/Main.java
index 4b981e6bff..9920960605 100644
--- a/eo-runtime/src/main/java/org/eolang/Main.java
+++ b/eo-runtime/src/main/java/org/eolang/Main.java
@@ -49,6 +49,7 @@
  *
  * @since 0.1
  */
+@Versionized
 public final class Main {
 
     /**
diff --git a/eo-runtime/src/main/java/org/eolang/Param.java b/eo-runtime/src/main/java/org/eolang/Param.java
index 149c430f9e..b5f2f85037 100644
--- a/eo-runtime/src/main/java/org/eolang/Param.java
+++ b/eo-runtime/src/main/java/org/eolang/Param.java
@@ -37,6 +37,7 @@
  *
  * @since 0.20
  */
+@Versionized
 public final class Param {
 
     /**
diff --git a/eo-runtime/src/main/java/org/eolang/PhConst.java b/eo-runtime/src/main/java/org/eolang/PhConst.java
index fd891e51fd..7dd38bd0f7 100644
--- a/eo-runtime/src/main/java/org/eolang/PhConst.java
+++ b/eo-runtime/src/main/java/org/eolang/PhConst.java
@@ -34,6 +34,7 @@
  *
  * @since 0.16
  */
+@Versionized
 public final class PhConst implements Phi {
 
     /**
diff --git a/eo-runtime/src/main/java/org/eolang/PhCopy.java b/eo-runtime/src/main/java/org/eolang/PhCopy.java
index a7bcde7d9a..59ae30941f 100644
--- a/eo-runtime/src/main/java/org/eolang/PhCopy.java
+++ b/eo-runtime/src/main/java/org/eolang/PhCopy.java
@@ -29,6 +29,7 @@
  *
  * @since 0.1
  */
+@Versionized
 public final class PhCopy extends PhOnce {
 
     /**
diff --git a/eo-runtime/src/main/java/org/eolang/PhDefault.java b/eo-runtime/src/main/java/org/eolang/PhDefault.java
index d93e4fd446..85a52d5433 100644
--- a/eo-runtime/src/main/java/org/eolang/PhDefault.java
+++ b/eo-runtime/src/main/java/org/eolang/PhDefault.java
@@ -44,6 +44,7 @@
  * @since 0.1
  * @checkstyle DesignForExtensionCheck (500 lines)
  */
+@Versionized
 @SuppressWarnings({"PMD.TooManyMethods", "PMD.ConstructorShouldDoInitialization"})
 public abstract class PhDefault implements Phi, Cloneable {
 
diff --git a/eo-runtime/src/main/java/org/eolang/PhFake.java b/eo-runtime/src/main/java/org/eolang/PhFake.java
index d113cd945f..497c3c5d21 100644
--- a/eo-runtime/src/main/java/org/eolang/PhFake.java
+++ b/eo-runtime/src/main/java/org/eolang/PhFake.java
@@ -34,6 +34,7 @@
  *
  * @since 0.29
  */
+@Versionized
 public final class PhFake extends PhDefault {
 
     /**
diff --git a/eo-runtime/src/main/java/org/eolang/PhImmovable.java b/eo-runtime/src/main/java/org/eolang/PhImmovable.java
index 6d0271e2df..4ec4d4b8be 100644
--- a/eo-runtime/src/main/java/org/eolang/PhImmovable.java
+++ b/eo-runtime/src/main/java/org/eolang/PhImmovable.java
@@ -29,6 +29,7 @@
  *
  * @since 0.23
  */
+@Versionized
 final class PhImmovable implements Phi {
 
     /**
diff --git a/eo-runtime/src/main/java/org/eolang/PhLocated.java b/eo-runtime/src/main/java/org/eolang/PhLocated.java
index ef4ecfa8d5..24bc3aa597 100644
--- a/eo-runtime/src/main/java/org/eolang/PhLocated.java
+++ b/eo-runtime/src/main/java/org/eolang/PhLocated.java
@@ -29,6 +29,7 @@
  *
  * @since 0.21
  */
+@Versionized
 public final class PhLocated implements Phi {
 
     /**
diff --git a/eo-runtime/src/main/java/org/eolang/PhLogged.java b/eo-runtime/src/main/java/org/eolang/PhLogged.java
index cb85d66f24..5bdcca2738 100644
--- a/eo-runtime/src/main/java/org/eolang/PhLogged.java
+++ b/eo-runtime/src/main/java/org/eolang/PhLogged.java
@@ -32,6 +32,7 @@
  *
  * @since 0.24
  */
+@Versionized
 public final class PhLogged implements Phi {
 
     /**
diff --git a/eo-runtime/src/main/java/org/eolang/PhMethod.java b/eo-runtime/src/main/java/org/eolang/PhMethod.java
index f52b66f381..3fa1b98c10 100644
--- a/eo-runtime/src/main/java/org/eolang/PhMethod.java
+++ b/eo-runtime/src/main/java/org/eolang/PhMethod.java
@@ -29,6 +29,7 @@
  *
  * @since 0.1
  */
+@Versionized
 public final class PhMethod extends PhOnce {
 
     /**
diff --git a/eo-runtime/src/main/java/org/eolang/PhNamed.java b/eo-runtime/src/main/java/org/eolang/PhNamed.java
index 85f1f6a666..ea1867d747 100644
--- a/eo-runtime/src/main/java/org/eolang/PhNamed.java
+++ b/eo-runtime/src/main/java/org/eolang/PhNamed.java
@@ -29,6 +29,7 @@
  *
  * @since 0.17
  */
+@Versionized
 final class PhNamed implements Phi {
 
     /**
diff --git a/eo-runtime/src/main/java/org/eolang/PhOnce.java b/eo-runtime/src/main/java/org/eolang/PhOnce.java
index 2154a769ea..9331565b3b 100644
--- a/eo-runtime/src/main/java/org/eolang/PhOnce.java
+++ b/eo-runtime/src/main/java/org/eolang/PhOnce.java
@@ -31,6 +31,7 @@
  *
  * @since 0.1
  */
+@Versionized
 class PhOnce implements Phi {
 
     /**
diff --git a/eo-runtime/src/main/java/org/eolang/PhPackage.java b/eo-runtime/src/main/java/org/eolang/PhPackage.java
index 7d277ac839..7dc5ae4a85 100644
--- a/eo-runtime/src/main/java/org/eolang/PhPackage.java
+++ b/eo-runtime/src/main/java/org/eolang/PhPackage.java
@@ -34,6 +34,7 @@
  *
  * @since 0.22
  */
+@Versionized
 final class PhPackage implements Phi {
 
     /**
diff --git a/eo-runtime/src/main/java/org/eolang/PhSafe.java b/eo-runtime/src/main/java/org/eolang/PhSafe.java
index efc6308151..00892dcbc0 100644
--- a/eo-runtime/src/main/java/org/eolang/PhSafe.java
+++ b/eo-runtime/src/main/java/org/eolang/PhSafe.java
@@ -32,6 +32,7 @@
  *
  * @since 0.26
  */
+@Versionized
 public final class PhSafe implements Phi {
 
     /**
diff --git a/eo-runtime/src/main/java/org/eolang/PhUnvar.java b/eo-runtime/src/main/java/org/eolang/PhUnvar.java
index 8ddd651175..c3b249e064 100644
--- a/eo-runtime/src/main/java/org/eolang/PhUnvar.java
+++ b/eo-runtime/src/main/java/org/eolang/PhUnvar.java
@@ -29,6 +29,7 @@
  *
  * @since 0.21
  */
+@Versionized
 public final class PhUnvar extends PhOnce {
 
     /**
diff --git a/eo-runtime/src/main/java/org/eolang/PhWith.java b/eo-runtime/src/main/java/org/eolang/PhWith.java
index af61bfd804..1435eb07fd 100644
--- a/eo-runtime/src/main/java/org/eolang/PhWith.java
+++ b/eo-runtime/src/main/java/org/eolang/PhWith.java
@@ -29,6 +29,7 @@
  *
  * @since 0.1
  */
+@Versionized
 public final class PhWith extends PhOnce {
 
     /**
diff --git a/eo-runtime/src/main/java/org/eolang/Term.java b/eo-runtime/src/main/java/org/eolang/Term.java
index 4d603e759d..5fc3fc842c 100644
--- a/eo-runtime/src/main/java/org/eolang/Term.java
+++ b/eo-runtime/src/main/java/org/eolang/Term.java
@@ -29,6 +29,7 @@
  *
  * @since 0.17
  */
+@Versionized
 public interface Term {
 
     /**
diff --git a/eo-runtime/src/main/java/org/eolang/Universe.java b/eo-runtime/src/main/java/org/eolang/Universe.java
index 6092f57799..76dd48f099 100644
--- a/eo-runtime/src/main/java/org/eolang/Universe.java
+++ b/eo-runtime/src/main/java/org/eolang/Universe.java
@@ -27,6 +27,7 @@
  * Class to manipulate eo objects within "Universe" paradigm.
  * @since 0.30
  */
+@Versionized
 public interface Universe {
 
     /**
diff --git a/eo-runtime/src/main/java/org/eolang/UniverseDefault.java b/eo-runtime/src/main/java/org/eolang/UniverseDefault.java
index 6991eabf68..91ec5b6220 100644
--- a/eo-runtime/src/main/java/org/eolang/UniverseDefault.java
+++ b/eo-runtime/src/main/java/org/eolang/UniverseDefault.java
@@ -31,6 +31,7 @@
  * Default implementation that can be used on the java side.
  * @since 0.32
  */
+@Versionized
 public final class UniverseDefault implements Universe {
 
     /**
diff --git a/eo-runtime/src/main/java/org/eolang/UniverseSafe.java b/eo-runtime/src/main/java/org/eolang/UniverseSafe.java
index 157c48a2d4..c6d8128d80 100644
--- a/eo-runtime/src/main/java/org/eolang/UniverseSafe.java
+++ b/eo-runtime/src/main/java/org/eolang/UniverseSafe.java
@@ -39,6 +39,7 @@
  * @since 0.32
  * @checkstyle IllegalCatchCheck (200 lines)
  */
+@Versionized
 public final class UniverseSafe implements Universe {
 
     /**
diff --git a/eo-runtime/src/main/java/org/eolang/Versionized.java b/eo-runtime/src/main/java/org/eolang/Versionized.java
new file mode 100644
index 0000000000..3d9368f6c8
--- /dev/null
+++ b/eo-runtime/src/main/java/org/eolang/Versionized.java
@@ -0,0 +1,41 @@
+/*
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2016-2023 Objectionary.com
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included
+ * in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+
+package org.eolang;
+
+import java.lang.annotation.ElementType;
+import java.lang.annotation.Retention;
+import java.lang.annotation.RetentionPolicy;
+import java.lang.annotation.Target;
+
+/**
+ * Annotation for an object which location should be extended with version package.
+ * More details <a href="https://github.com/objectionary/eo/issues/2506">here</a>
+ *
+ * @since 0.32.0
+ */
+@Target(ElementType.TYPE)
+@Retention(RetentionPolicy.CLASS)
+public @interface Versionized {
+}
diff --git a/eo-runtime/src/main/java/org/eolang/Volatile.java b/eo-runtime/src/main/java/org/eolang/Volatile.java
index a1b58344f4..ba80e82cb7 100644
--- a/eo-runtime/src/main/java/org/eolang/Volatile.java
+++ b/eo-runtime/src/main/java/org/eolang/Volatile.java
@@ -36,5 +36,6 @@
  */
 @Target(ElementType.TYPE)
 @Retention(RetentionPolicy.RUNTIME)
+@Versionized
 public @interface Volatile {
 }
diff --git a/eo-runtime/src/main/java/org/eolang/XmirObject.java b/eo-runtime/src/main/java/org/eolang/XmirObject.java
index e140893858..cc0775a95b 100644
--- a/eo-runtime/src/main/java/org/eolang/XmirObject.java
+++ b/eo-runtime/src/main/java/org/eolang/XmirObject.java
@@ -36,6 +36,7 @@
  */
 @Target(ElementType.TYPE)
 @Retention(RetentionPolicy.RUNTIME)
+@Versionized
 public @interface XmirObject {
 
     /**