diff --git a/ChangeLog.md b/ChangeLog.md
index edefea9330cfc..3ae469aec7456 100644
--- a/ChangeLog.md
+++ b/ChangeLog.md
@@ -24,6 +24,7 @@ See docs/process.md for more on how version tagging works.
 3.1.73 - 11/28/24
 -----------------
 - libunwind was updated to LLVM 19.1.4. (#22394)
+- mimalloc was updated to 2.1.7. (#21548)
 
 3.1.72 - 11/19/24
 -----------------