diff --git a/CHANGELOG.md b/CHANGELOG.md
index a57d1d4..1af6124 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -10,6 +10,8 @@ list yields a list of all related PRs for each release.
 
 # [unreleased]
 
+`tmtccmd` version: v5.0.0a0
+
 ## Added
 
 - Event handling for reboot counter events.
@@ -19,6 +21,7 @@ list yields a list of all related PRs for each release.
 ## Fixed
 
 - Fix for PLOC power switching.
+- Bump `tmtccmd` to v5.0.0a0 for important bugfix in CFDP header.
 
 # [v3.1.1] 2023-04-17