diff --git a/lib/mysql2/version.rb b/lib/mysql2/version.rb
index 08fb599c3..e669349ee 100644
--- a/lib/mysql2/version.rb
+++ b/lib/mysql2/version.rb
@@ -1,3 +1,3 @@
 module Mysql2
-  VERSION = "0.3.20"
+  VERSION = "0.3.21"
 end