diff --git a/CHANGES.md b/CHANGES.md
index 0938540c48e..f06ae9b5bc9 100644
--- a/CHANGES.md
+++ b/CHANGES.md
@@ -4,7 +4,7 @@ Libplanet changelog
 Version 3.3.1
 -------------
 
-To be released.
+Released on September 8, 2023.
 
 -  (Libplanet.Store) Fixed a bug where `ITrie.Get()` could wrongly retrieve
    an `IValue` from a non-existent path.  [[#3420]]