diff --git a/CHANGELOG.md b/CHANGELOG.md
index bcf08a5..f3a0b9c 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,8 @@
+## 0.1.1
+
+- Use [MessagePack](https://github.com/msgpack/msgpack-ruby) for semaphore serialization.
+
+
 ## 0.1.0
 
-- First release
+- First release.
diff --git a/lib/suo/version.rb b/lib/suo/version.rb
index 4e804ef..d00ad7a 100644
--- a/lib/suo/version.rb
+++ b/lib/suo/version.rb
@@ -1,3 +1,3 @@
 module Suo
-  VERSION = "0.1.0"
+  VERSION = "0.1.1"
 end