diff --git a/CHANGELOG.md b/CHANGELOG.md
index 2369f6cb..aad191d5 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -5,7 +5,14 @@ This project adheres to [Semantic Versioning](http://semver.org/).
 
 ## [Unreleased]
 
+## [2.5.1] - 2020-04-07
+
+### Changed
+- Collect metrics synchronously instead of collecting periodically (#185).
+
 ## [2.5.0] - 2020-01-17
+
+### Added
 - Add Prometheus instrumentation (#181).
 
 ## [2.4.9] - 2019-12-26
@@ -158,7 +165,8 @@ No changes.  Only for updating Docker base image.
 
 See [CHANGELOG-0](./CHANGELOG-0.md).
 
-[Unreleased]: https://github.com/cybozu-go/sabakan/compare/v2.5.0...HEAD
+[Unreleased]: https://github.com/cybozu-go/sabakan/compare/v2.5.1...HEAD
+[2.5.1]: https://github.com/cybozu-go/sabakan/compare/v2.5.0...v2.5.1
 [2.5.0]: https://github.com/cybozu-go/sabakan/compare/v2.4.9...v2.5.0
 [2.4.9]: https://github.com/cybozu-go/sabakan/compare/v2.4.8...v2.4.9
 [2.4.8]: https://github.com/cybozu-go/sabakan/compare/v2.4.7...v2.4.8
diff --git a/version.go b/version.go
index 912ef056..9ca5f536 100644
--- a/version.go
+++ b/version.go
@@ -1,7 +1,7 @@
 package sabakan
 
 // Version is sabakan version
-const Version = "2.5.0"
+const Version = "2.5.1"
 
 // SchemaVersion is the schema version
 const SchemaVersion = "3"