diff --git a/CHANGELOG.md b/CHANGELOG.md
index 3a34ff7..aa7457f 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -14,6 +14,8 @@ list yields a list of all related PRs for each release.
 
 tmtccmd version 4.0.0
 
+Added `python-dateutil` dependency for time prompts.
+
 ## Added
 
 - Basic persistent TM store commanding