diff --git a/lib/yao/version.rb b/lib/yao/version.rb
index 7d3900d..da28dd1 100644
--- a/lib/yao/version.rb
+++ b/lib/yao/version.rb
@@ -1,3 +1,3 @@
 module Yao
-  VERSION = "0.20.0"
+  VERSION = "0.21.0"
 end