diff --git a/Lib/fontTools/__init__.py b/Lib/fontTools/__init__.py
index b54138fea..52c85a7fe 100644
--- a/Lib/fontTools/__init__.py
+++ b/Lib/fontTools/__init__.py
@@ -4,6 +4,6 @@ from fontTools.misc.loggingTools import configLogger
 
 log = logging.getLogger(__name__)
 
-version = __version__ = "4.10.1"
+version = __version__ = "4.10.2.dev0"
 
 __all__ = ["version", "log", "configLogger"]
diff --git a/setup.cfg b/setup.cfg
index 6682806aa..5c11928b1 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -1,5 +1,5 @@
 [bumpversion]
-current_version = 4.10.1
+current_version = 4.10.2.dev0
 commit = True
 tag = False
 tag_name = {new_version}
diff --git a/setup.py b/setup.py
index cd3c2b5d3..67dc7b563 100755
--- a/setup.py
+++ b/setup.py
@@ -437,7 +437,7 @@ if ext_modules:
 
 setup_params = dict(
 	name="fonttools",
-	version="4.10.1",
+	version="4.10.2.dev0",
 	description="Tools to manipulate font files",
 	author="Just van Rossum",
 	author_email="just@letterror.com",