diff --git a/.bumpversion.cfg b/.bumpversion.cfg
index 3ff1815..32d4e1f 100644
--- a/.bumpversion.cfg
+++ b/.bumpversion.cfg
@@ -1,5 +1,5 @@
 [bumpversion]
-current_version = 0.4.0
+current_version = 0.4.1.dev0
 commit = True
 tag = True
 sign_tags = True
diff --git a/omeroserver/version.py b/omeroserver/version.py
index 03529ff..c5b4c32 100644
--- a/omeroserver/version.py
+++ b/omeroserver/version.py
@@ -1 +1 @@
-omeroserver_version = "0.4.0"
+omeroserver_version = "0.4.1.dev0"