diff --git a/gns3server/version.py b/gns3server/version.py
index 09dc36bb..a9044c90 100644
--- a/gns3server/version.py
+++ b/gns3server/version.py
@@ -23,5 +23,5 @@
 # or negative for a release candidate or beta (after the base version
 # number has been incremented)
 
-__version__ = "1.0a4"
+__version__ = "1.0a5.dev1"
 __version_info__ = (1, 0, 0, -99)