diff --git a/gns3server/version.py b/gns3server/version.py
index 6f26e27d..3b1585c1 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__ = "1.5.1"
-__version_info__ = (1, 5, 1, 0)
+__version__ = "1.5.2dev1"
+__version_info__ = (1, 5, 2, -99)