diff --git a/Lib/ufoLib/__init__.py b/Lib/ufoLib/__init__.py
index fa25d8254..05edc15d4 100755
--- a/Lib/ufoLib/__init__.py
+++ b/Lib/ufoLib/__init__.py
@@ -55,7 +55,7 @@ __all__ = [
 	"convertUFOFormatVersion1ToFormatVersion2",
 ]
 
-__version__ = "2.2.0"
+__version__ = "2.2.1.dev0"
 
 
 class UFOLibError(Exception): pass
diff --git a/setup.cfg b/setup.cfg
index a3e6aaf95..eaf1b3c82 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -1,5 +1,5 @@
 [bumpversion]
-current_version = 2.2.0
+current_version = 2.2.1.dev0
 commit = True
 tag = False
 tag_name = v{new_version}
diff --git a/setup.py b/setup.py
index 3df75f784..a3d643113 100755
--- a/setup.py
+++ b/setup.py
@@ -147,7 +147,7 @@ http://unifiedfontobject.org
 
 setup_params = dict(
 	name="ufoLib",
-	version="2.2.0",
+	version="2.2.1.dev0",
 	description="A low-level UFO reader and writer.",
 	author="Just van Rossum, Tal Leming, Erik van Blokland, others",
 	author_email="info@robofab.com",