diff --git a/docker/version.py b/docker/version.py
index d7a9a776..88859a6c 100644
--- a/docker/version.py
+++ b/docker/version.py
@@ -1,2 +1,2 @@
-version = "1.2.3"
+version = "1.3.0-dev"
 version_info = tuple([int(d) for d in version.split("-")[0].split(".")])