diff --git a/docs/changes.rst b/docs/changes.rst
index 3c480257..e2e5c6f2 100644
--- a/docs/changes.rst
+++ b/docs/changes.rst
@@ -1,6 +1,12 @@
 Changelog
 =========
 
+9.1.2 (unreleased)
+------------------
+
+- Nothing changed yet.
+
+
 9.1.1 (2024-02-06)
 ------------------
 
diff --git a/setup.py b/setup.py
index e233d181..a3b5e2dc 100644
--- a/setup.py
+++ b/setup.py
@@ -5,7 +5,7 @@
 import os
 
 
-version = "9.1.1"
+version = "9.1.2.dev0"
 
 setup(
     name="osha.oira",