diff --git a/Lib/ufoLib/__init__.py b/Lib/ufoLib/__init__.py
index 1c44f22..54cb87a 100755
--- a/Lib/ufoLib/__init__.py
+++ b/Lib/ufoLib/__init__.py
@@ -56,7 +56,7 @@
 	"convertUFOFormatVersion1ToFormatVersion2",
 ]
 
-__version__ = "2.3.1.dev0"
+__version__ = "2.3.1"
 
 
 class UFOLibError(Exception): pass
diff --git a/setup.cfg b/setup.cfg
index 0ae19d4..e0210f3 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -1,5 +1,5 @@
 [bumpversion]
-current_version = 2.3.1.dev0
+current_version = 2.3.1
 commit = True
 tag = False
 tag_name = v{new_version}
diff --git a/setup.py b/setup.py
index 8017e21..927822d 100755
--- a/setup.py
+++ b/setup.py
@@ -147,7 +147,7 @@ def run(self):
 
 setup_params = dict(
 	name="ufoLib",
-	version="2.3.1.dev0",
+	version="2.3.1",
 	description="A low-level UFO reader and writer.",
 	author="Just van Rossum, Tal Leming, Erik van Blokland, others",
 	author_email="info@robofab.com",