diff --git a/CHANGELOG.md b/CHANGELOG.md
index afb014a..9799bb1 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -4,6 +4,16 @@
 
 ## [Unreleased]
 
+## [2.2.1] - 2024-09-24
+
+### Fixed
+
+- Ignore unknownError related to ConcurrentModificationException ([#137](https://github.com/getyourguide/openapi-validation-java/pull/137))
+
+### Changed
+
+- Updated several dependencies
+
 ## [2.2.0] - 2024-08-27
 
 ### Added
@@ -175,7 +185,8 @@
 - Initial squashed GitHub public release.
 
 
-[unreleased]: https://github.com/getyourguide/openapi-validation-java/compare/v2.2.0...HEAD
+[unreleased]: https://github.com/getyourguide/openapi-validation-java/compare/v2.2.1...HEAD
+[2.2.1]: https://github.com/getyourguide/openapi-validation-java/releases/tag/v2.2.1
 [2.2.0]: https://github.com/getyourguide/openapi-validation-java/releases/tag/v2.2.0
 [2.1.0]: https://github.com/getyourguide/openapi-validation-java/releases/tag/v2.1.0
 [2.0.3]: https://github.com/getyourguide/openapi-validation-java/releases/tag/v2.0.3
diff --git a/build.gradle b/build.gradle
index 8926f55..7f32672 100644
--- a/build.gradle
+++ b/build.gradle
@@ -10,7 +10,7 @@ apply from: "${rootDir}/gradle/publish-root.gradle"
 allprojects {
     group = 'com.getyourguide.openapi.validation'
     description = 'OpenAPI Validation library'
-    version = '2.2.0'
+    version = '2.2.1'
 
     java {
         toolchain {