diff --git a/lib/docker/version.rb b/lib/docker/version.rb
index 10ab65e3c..fc348ac60 100644
--- a/lib/docker/version.rb
+++ b/lib/docker/version.rb
@@ -1,6 +1,6 @@
 module Docker
   # The version of the docker-api gem.
-  VERSION = '1.20.0'
+  VERSION = '1.21.0'
 
   # The version of the compatible Docker remote API.
   API_VERSION = '1.16'