diff --git a/lib/galaxy/version.py b/lib/galaxy/version.py
index 9efabad780e..4cc6696b1e8 100644
--- a/lib/galaxy/version.py
+++ b/lib/galaxy/version.py
@@ -1,3 +1,3 @@
 VERSION_MAJOR = "21.05"
-VERSION_MINOR = ""
+VERSION_MINOR = "1.dev0"
 VERSION = VERSION_MAJOR + ('.' + VERSION_MINOR if VERSION_MINOR else '')