diff --git a/CHANGELOG.md b/CHANGELOG.md
index d11e243..d545a77 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,7 @@
+## [1.5.1] - 2025-02-16
+
+- Optimize Cartridge::Mbc1 and Bus
+
 ## [1.5.0] - 2025-02-09
 
 - Add EmulatorHeadless and use it for bench
diff --git a/Gemfile.lock b/Gemfile.lock
index 292be9c..aca300f 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -1,7 +1,7 @@
 PATH
   remote: .
   specs:
-    rubyboy (1.5.0)
+    rubyboy (1.5.1)
       ffi (~> 1.16, >= 1.16.3)
 
 GEM
diff --git a/lib/rubyboy/version.rb b/lib/rubyboy/version.rb
index 796188f..1d57659 100644
--- a/lib/rubyboy/version.rb
+++ b/lib/rubyboy/version.rb
@@ -1,5 +1,5 @@
 # frozen_string_literal: true
 
 module Rubyboy
-  VERSION = '1.5.0'
+  VERSION = '1.5.1'
 end