diff --git a/docs/changelog.rst b/docs/changelog.rst
index 80fe73870..dfbf16436 100644
--- a/docs/changelog.rst
+++ b/docs/changelog.rst
@@ -18,6 +18,11 @@ To avail of fixes in an unreleased version, please download a ZIP file
 `directly from GitHub <https://github.com/mitogen-hq/mitogen/>`_.
 
 
+In progress (unreleased)
+------------------------
+
+
+
 v0.3.22 (2025-02-04)
 --------------------
 
diff --git a/mitogen/__init__.py b/mitogen/__init__.py
index 61fce8888..125ab0527 100644
--- a/mitogen/__init__.py
+++ b/mitogen/__init__.py
@@ -35,7 +35,7 @@
 
 
 #: Library version as a tuple.
-__version__ = (0, 3, 22)
+__version__ = (0, 3, 23, 'dev')
 
 
 #: This is :data:`False` in slave contexts. Previously it was used to prevent