diff --git a/CHANGELOG.md b/CHANGELOG.md
index 33ac644..1e0c444 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -13,6 +13,11 @@ Note: These changes are not considered notable:
 
 ## [Unreleased]
 
+## [6.4.1] - 2025-12-04
+
+### Changed
+- Bump yggdrasil-engine
+
 ## [6.4.0] - 2025-08-12
 ### Added
 - Experimental streaming support
diff --git a/README.md b/README.md
index bfb9b7d..0ed5dea 100644
--- a/README.md
+++ b/README.md
@@ -28,7 +28,7 @@ You can use this client with [Unleash Enterprise](https://www.getunleash.io/pric
 Add this line to your application's Gemfile:
 
 ```ruby
-gem 'unleash', '~> 6.3.0'
+gem 'unleash', '~> 6.4.1'
 ```
 
 And then execute:
diff --git a/lib/unleash/version.rb b/lib/unleash/version.rb
index 1e475c1..2adcdaa 100644
--- a/lib/unleash/version.rb
+++ b/lib/unleash/version.rb
@@ -1,3 +1,3 @@
 module Unleash
-  VERSION = "6.4.0".freeze
+  VERSION = "6.4.1".freeze
 end
diff --git a/unleash-client.gemspec b/unleash-client.gemspec
index 874650c..b4eef15 100644
--- a/unleash-client.gemspec
+++ b/unleash-client.gemspec
@@ -24,7 +24,7 @@ Gem::Specification.new do |spec|
   spec.required_ruby_version = ">= 2.7"
 
   spec.add_dependency "ld-eventsource", "2.2.4" unless RUBY_ENGINE == 'jruby'
-  spec.add_dependency "yggdrasil-engine", "~> 1.1.0"
+  spec.add_dependency "yggdrasil-engine", "~> 1.1.1"
 
   spec.add_dependency "base64", "~> 0.3.0"
   spec.add_dependency "logger", "~> 1.6"