diff --git a/setup.py b/setup.py
index 821f3ce..6ee3c5c 100644
--- a/setup.py
+++ b/setup.py
@@ -14,7 +14,7 @@
 
 setup(
     name="nameko-grpc",
-    version="1.3.0",
+    version="1.4.0rc1",
     description="Nameko gRPC extensions",
     long_description=readme,
     long_description_content_type="text/markdown",