diff --git a/CHANGELOG.md b/CHANGELOG.md
index 2a3e691..f0ac9eb 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,16 @@
+# v0.5.0 (unreleased)
+
+* Fixed `main_class` to default to being loaded from the last module instead of
+  the first if a module name is not explicitly specified.
+  * This was already the [documented behavior](https://docs.mau.fi/maubot/dev/reference/plugin-metadata.html),
+    and loading from the first module doesn't make sense due to import order.
+* Added simple scheduler utility for running background tasks periodically or
+  after a certain delay.
+* Added testing framework for plugins (thanks to [@abompard] in [#225]).
+
+[#225]: https://github.com/maubot/maubot/issues/225
+[@abompard]: https://github.com/abompard
+
 # v0.4.2 (2023-09-20)
 
 * Updated Pillow to 10.0.1.