diff --git a/gns3server/version.py b/gns3server/version.py
index ea19764f..daa9ff7f 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__ = "1.5.4"
-__version_info__ = (1, 5, 4, 0)
+__version__ = "1.5.5dev1"
+__version_info__ = (1, 5, 5, -99)