diff --git a/CHANGES.rst b/CHANGES.rst
index 588dd2a..f0f44c7 100644
--- a/CHANGES.rst
+++ b/CHANGES.rst
@@ -1,6 +1,12 @@
 Changes
 =======
 
+2.1.1 (unreleased)
+------------------
+
+- Nothing changed yet.
+
+
 2.1.0 (2024-05-31)
 ------------------
 
diff --git a/setup.py b/setup.py
index 3c43b5d..bea513a 100644
--- a/setup.py
+++ b/setup.py
@@ -5,7 +5,7 @@
 
 setup(
     name='gocept.collmex',
-    version='2.1.0',
+    version='2.1.1.dev0',
     author='gocept',
     author_email='mail@gocept.com',
     description='Python-bindings for the Collmex import/export API',