diff --git a/CHANGELOG.rst b/CHANGELOG.rst
index d1f646bb9022577ce60a76cf753c369b8beca06f..3ae079fd2f411240faddd735cfa9336eb38cbb5b 100644
--- a/CHANGELOG.rst
+++ b/CHANGELOG.rst
@@ -6,6 +6,9 @@ All notable changes to this project will be documented in this file.
 The format is based on `Keep a Changelog`_,
 and this project adheres to `Semantic Versioning`_.
 
+Unreleased
+----------
+
 `2.5`_ – 2022-01-02
 -------------------
 
diff --git a/pyproject.toml b/pyproject.toml
index eb152c0821a31473bed821e34be945b1aeea47da..a8a4a7fcc9da6a40bbc0fd6e80d25599caf40fd0 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -1,6 +1,6 @@
 [tool.poetry]
 name = "AlekSIS-Core"
-version = "2.5"
+version = "2.5.1.dev0"
 packages = [
     { include = "aleksis" }
 ]