diff --git a/ruby/ChangeLog b/ruby/ChangeLog
index 19a3de09..99e78d48 100644
--- a/ruby/ChangeLog
+++ b/ruby/ChangeLog
@@ -1,4 +1,8 @@
 
+2011-08-08 version 0.4.6:
+
+  * Fixed compile error problem on Mac OS X Lion
+
 2011-05-09 version 0.4.5:
 
   * Improves compatibility with JRuby
diff --git a/ruby/version.rb b/ruby/version.rb
index 1708ff00..e2e63d96 100644
--- a/ruby/version.rb
+++ b/ruby/version.rb
@@ -1,3 +1,3 @@
 module MessagePack
-	VERSION = "0.4.5"
+	VERSION = "0.4.6"
 end