diff --git a/setup.py b/setup.py
index eba7cd5db2..e08cdedd3c 100644
--- a/setup.py
+++ b/setup.py
@@ -4,7 +4,7 @@
 import sys
 
 
-version = "9.1.1"
+version = "9.1.2.dev0"
 
 if sys.version_info.major == 2:
     raise ValueError(