diff --git a/CHANGELOG.md b/CHANGELOG.md
index 1116cc4..13f144b 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,12 @@
 # Changelog
 
+## [2.21.1](https://github.com/phrase/openapi/compare/go-v2.21.0...go-v2.21.1) (2023-12-20)
+
+
+### Bug Fixes
+
+* **GO:** Fix format_option serialization when creating upload ([#498](https://github.com/phrase/openapi/issues/498)) ([7c04f1e](https://github.com/phrase/openapi/commit/7c04f1e1f9fd280f56e15520626166ab3b5b6db5))
+
 ## [2.21.0](https://github.com/phrase/openapi/compare/go-v2.20.0...go-v2.21.0) (2023-12-13)
 
 
diff --git a/README.md b/README.md
index 925c37d..a86eaa0 100644
--- a/README.md
+++ b/README.md
@@ -536,7 +536,7 @@ Class | Method | HTTP request | Description
 This API client was generated by the [OpenAPI Generator](https://openapi-generator.tech) project.
 
 - API version: 2.0.0
-- Package version: 2.21.0
+- Package version: 2.21.1
 - Build package: org.openapitools.codegen.languages.GoClientCodegen
 For more information, please visit [https://developers.phrase.com/api/](https://developers.phrase.com/api/)
 
diff --git a/configuration.go b/configuration.go
index d422d4a..4a0d43f 100644
--- a/configuration.go
+++ b/configuration.go
@@ -70,7 +70,7 @@ type Configuration struct {
 }
 
 func ClientVersion() string {
-	return "2.21.0"
+	return "2.21.1"
 }
 
 func getUserAgent() string {