diff --git a/CMakeLists.txt b/CMakeLists.txt
index 60d89b35..16c14325 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -17,7 +17,7 @@ endif()
 # Metall general configuration
 # -------------------------------------------------------------------------------- #
 project(Metall
-        VERSION 0.25
+        VERSION 0.26
         DESCRIPTION "A persistent memory allocator for data-centric analytics"
         HOMEPAGE_URL "https://github.com/LLNL/metall")
 
diff --git a/docs/Doxyfile.in b/docs/Doxyfile.in
index 53ae902a..8c7af008 100644
--- a/docs/Doxyfile.in
+++ b/docs/Doxyfile.in
@@ -38,7 +38,7 @@ PROJECT_NAME           = "Metall"
 # could be handy for archiving the generated documentation or if some version
 # control system is used.
 
-PROJECT_NUMBER         = v0.25
+PROJECT_NUMBER         = v0.26
 
 # Using the PROJECT_BRIEF tag one can provide an optional one line description
 # for a project that appears at the top of each page and should give viewer a
diff --git a/include/metall/version.hpp b/include/metall/version.hpp
index 8994bca2..0aac9c1e 100644
--- a/include/metall/version.hpp
+++ b/include/metall/version.hpp
@@ -14,7 +14,7 @@
 ///  METALL_VERSION / 100 % 1000 // the minor version.
 ///  METALL_VERSION % 100 // the patch level.
 /// \endcode
-#define METALL_VERSION 2500
+#define METALL_VERSION 2600
 
 namespace metall {
 /// \brief Variable type to handle a version data.