diff --git a/cyipopt/version.py b/cyipopt/version.py
index dc7d719..792e99a 100644
--- a/cyipopt/version.py
+++ b/cyipopt/version.py
@@ -9,4 +9,4 @@
 License: EPL 2.0
 """
 
-__version__ = '1.4.0'
+__version__ = '1.5.0.dev0'