diff --git a/CHANGELOG.md b/CHANGELOG.md
index 79431c91..3496f9a0 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,9 @@
 # Changelog
 
+## [v0.51.4](https://github.com/k1LoW/octocov/compare/v0.51.3...v0.51.4) - 2023-09-03
+### Other Changes
+- Enhance validation related to custom metrics (e.g., key uniqueness) by @k1LoW in https://github.com/k1LoW/octocov/pull/264
+
 ## [v0.51.3](https://github.com/k1LoW/octocov/compare/v0.51.2...v0.51.3) - 2023-09-03
 ### Breaking Changes 🛠
 - If the value of custom metric is determined to be an integer, the metric is displayed as an integer by @k1LoW in https://github.com/k1LoW/octocov/pull/261
diff --git a/version/version.go b/version/version.go
index 23d93aa3..d744f351 100644
--- a/version/version.go
+++ b/version/version.go
@@ -4,4 +4,4 @@ package version
 const Name string = "octocov"
 
 // Version for this.
-var Version = "0.51.3"
+var Version = "0.51.4"