diff --git a/doc/CHANGELOG b/doc/CHANGELOG
index aef7058a7..9f1c41b5c 100644
--- a/doc/CHANGELOG
+++ b/doc/CHANGELOG
@@ -4,6 +4,23 @@ Redmine - project management software
 Copyright (C) 2006-  Jean-Philippe Lang
 https://www.redmine.org/
 
+== 2026-01-05 v5.1.11
+
+=== [Code cleanup/refactoring]
+
+* Defect #43441: Fix failures in test/system/issues_test.rb
+* Patch #43638: Update copyright year to 2026
+
+=== [Gems support]
+
+* Defect #43609: Tests fail with minitest 6.0
+
+=== [Security]
+
+* Defect #43451: PostScript disguised as PDF can lead to arbitrary file operations via thumbnail generation
+* Defect #43634: Authorization bypass in Redmine allows modification of attachment metadata on invisible issues
+* Defect #43635: Authorization bypass in Redmine allows deletion of attachment on invisible issues external
+
 == 2025-09-21 v5.1.10
 
 === [Importers]
diff --git a/lib/redmine/version.rb b/lib/redmine/version.rb
index b5c89c70c..27dbcaf75 100644
--- a/lib/redmine/version.rb
+++ b/lib/redmine/version.rb
@@ -7,7 +7,7 @@ module Redmine
   module VERSION
     MAJOR = 5
     MINOR = 1
-    TINY  = 10
+    TINY  = 11
 
     # Branch values:
     # * official release: nil