diff --git a/CHANGELOG.md b/CHANGELOG.md
index 56578442fb..17e6de66d9 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,24 @@
+# v1.13.1
+
+## Release v1.13.1 - 2021/06/29
+
+### Enhancement
+
+### Bug fix
+
+* out_forward: Fixed a race condition on handshake
+  It's caused by using a same unpacker from multiple threads.
+  https://github.com/fluent/fluentd/pull/3405
+  https://github.com/fluent/fluentd/pull/3406
+
+### Misc
+
+* Pretty print for Fluent::Config::Section has been supported
+  for debugging
+  https://github.com/fluent/fluentd/pull/3398
+* CI: Dropped to run CI for Ruby 2.5
+  https://github.com/fluent/fluentd/pull/3412
+
 # v1.13
 
 ## Release v1.13.0 - 2021/05/29
diff --git a/lib/fluent/version.rb b/lib/fluent/version.rb
index 89837f363a..9e6c10dd6f 100644
--- a/lib/fluent/version.rb
+++ b/lib/fluent/version.rb
@@ -16,6 +16,6 @@
 
 module Fluent
 
-  VERSION = '1.13.0'
+  VERSION = '1.13.1'
 
 end