diff --git a/CHANGELOG.md b/CHANGELOG.md
index 3c582858..87580ade 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,9 @@
 # Changelog
 
+## [0.5.2] - 2026-XX-XX
+
+In development
+
 ## [0.5.1] - 2026-03-05
 
 - Require tskit >= 1.0