diff --git a/CHANGES.txt b/CHANGES.txt
index a1407b8..1d46547 100644
--- a/CHANGES.txt
+++ b/CHANGES.txt
@@ -1,6 +1,12 @@
 Changes
 =======
 
+2.1 (unreleased)
+----------------
+
+- Nothing changed yet.
+
+
 2.0 (2023-02-10)
 ----------------
 
diff --git a/setup.py b/setup.py
index 97f8eb6..70fc915 100644
--- a/setup.py
+++ b/setup.py
@@ -18,7 +18,7 @@ def read(*rnames):
 
 setup(
     name='z3c.unconfigure',
-    version='2.0',
+    version='2.1.dev0',
     description=("Disable specific ZCML directives in other package's "
                  "configuration"),
     long_description=long_description,