diff --git a/lib/galaxy/version.py b/lib/galaxy/version.py
index acb55c9d4de..bcffb383e01 100644
--- a/lib/galaxy/version.py
+++ b/lib/galaxy/version.py
@@ -1,3 +1,3 @@
-VERSION_MAJOR = "15.03"
-VERSION_MINOR = None
+VERSION_MAJOR = "15.05"
+VERSION_MINOR = "dev"
 VERSION = VERSION_MAJOR + ('.' + VERSION_MINOR if VERSION_MINOR else '')