diff --git a/docker/version.py b/docker/version.py
index 491566cd..8a12c002 100644
--- a/docker/version.py
+++ b/docker/version.py
@@ -1,2 +1,2 @@
-version = "2.1.0"
+version = "2.2.0-dev"
 version_info = tuple([int(d) for d in version.split("-")[0].split(".")])