diff --git a/CHANGES.md b/CHANGES.md
index 22075fef..4d65d94a 100644
--- a/CHANGES.md
+++ b/CHANGES.md
@@ -1,6 +1,12 @@
 ## Changelog
 
 
+## 2.5.1 (unreleased)
+---------------------
+
+- Nothing changed yet.
+
+
 ## 2.5.0 (2024-09-04)
 -----------------------
 
diff --git a/src/batou/version.txt b/src/batou/version.txt
index 437459cd..0628f7d6 100644
--- a/src/batou/version.txt
+++ b/src/batou/version.txt
@@ -1 +1 @@
-2.5.0
+2.5.1.dev0