diff --git a/CHANGELOG.md b/CHANGELOG.md
index ba93f79..e3ed4bb 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -7,6 +7,8 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## [Unreleased]
 
+## [0.12.1] - 2026-09-03
+
 ### Fixed
 - Emit Langfuse v4 experiment attributes for local and dataset-backed experiment observations (#118).
 
@@ -176,7 +178,8 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 - Migrated from legacy ingestion API to OTLP endpoint
 - Removed `tracing_enabled` configuration flag (#2)
 
-[Unreleased]: https://github.com/simplepractice/langfuse-rb/compare/v0.12.0...HEAD
+[Unreleased]: https://github.com/simplepractice/langfuse-rb/compare/v0.12.1...HEAD
+[0.12.1]: https://github.com/simplepractice/langfuse-rb/compare/v0.12.0...v0.12.1
 [0.12.0]: https://github.com/simplepractice/langfuse-rb/compare/v0.11.0...v0.12.0
 [0.11.0]: https://github.com/simplepractice/langfuse-rb/compare/v0.10.1...v0.11.0
 [0.10.1]: https://github.com/simplepractice/langfuse-rb/compare/v0.10.0...v0.10.1
diff --git a/Gemfile.lock b/Gemfile.lock
index a4b5f83..bc4f759 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -1,7 +1,7 @@
 PATH
   remote: .
   specs:
-    langfuse-rb (0.12.0)
+    langfuse-rb (0.12.1)
       base64 (~> 0.2)
       concurrent-ruby (>= 1.3.7, < 2.0)
       faraday (>= 2.14.3, < 3)
diff --git a/lib/langfuse/version.rb b/lib/langfuse/version.rb
index d6b013a..ce2a8eb 100644
--- a/lib/langfuse/version.rb
+++ b/lib/langfuse/version.rb
@@ -1,5 +1,5 @@
 # frozen_string_literal: true
 
 module Langfuse
-  VERSION = "0.12.0"
+  VERSION = "0.12.1"
 end