diff --git a/ChangeLog.md b/ChangeLog.md
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+++ b/ChangeLog.md
@@ -1,5 +1,12 @@
 # Complexitty ChangeLog
 
+## Unreleased
+
+**Released: WiP**
+
+- Migrated from `rye` to `uv` for development management.
+  ([#25](https://github.com/davep/complexitty/pull/25))
+
 ## v0.3.0
 
 **Released: 2025-04-25**