diff --git a/.github/workflows/mvn.yml b/.github/workflows/mvn.yml
index 854bc6f863..80b2d3989c 100644
--- a/.github/workflows/mvn.yml
+++ b/.github/workflows/mvn.yml
@@ -38,8 +38,8 @@ jobs:
     name: mvn
     strategy:
       matrix:
-        os: [ ubuntu-20.04, windows-2022, macos-12 ]
-        java: [ 11, 20 ]
+        os: [ ubuntu-24.04, windows-2022, macos-12 ]
+        java: [ 11, 21 ]
     runs-on: ${{ matrix.os }}
     env:
       CONVERT_PATH: /tmp/antlr4-to-bnf-converter
diff --git a/eo-runtime/src/test/java/org/eolang/PhiUnphiIT.java b/eo-runtime/src/test/java/org/eolang/PhiUnphiIT.java
index 6abbc1dd50..9d4d891e7b 100755
--- a/eo-runtime/src/test/java/org/eolang/PhiUnphiIT.java
+++ b/eo-runtime/src/test/java/org/eolang/PhiUnphiIT.java
@@ -23,7 +23,6 @@
  */
 package org.eolang;
 
-import com.jcabi.log.Logger;
 import com.yegor256.WeAreOnline;
 import com.yegor256.farea.Farea;
 import java.io.IOException;
@@ -238,14 +237,12 @@ void runsTestsAfterPhiAndUnphi(final @TempDir Path temp) throws IOException {
                     .set("withRuntimeDependency", PhiUnphiIT.FALSE)
                     .set("placeBinariesThatHaveSources", PhiUnphiIT.TRUE);
                 f.exec("clean", "test");
-                final String log = f.log();
-                final boolean success = log.contains("BUILD SUCCESS");
-                if (!success) {
-                    Logger.info(this, log);
-                }
                 Assertions.assertTrue(
-                    success,
-                    "Some tests weren't passed after converting to phi and back"
+                    f.log().contains("BUILD SUCCESS"),
+                    String.format(
+                        "Some tests weren't passed after converting to phi and back:\n%s",
+                        f.log()
+                    )
                 );
             }
         );