diff --git a/CHANGELOG.md b/CHANGELOG.md
index 087ebf6af..8b2169380 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -53,6 +53,7 @@
 - Skills: add tmux-first coding-agent skill + `requires.anyBins` gate for multi-CLI setup (thanks @sreekaransrinath).
 
 ### Fixes
+- Gog calendar: format date ranges as RFC 3339 with timezone to satisfy Google Calendar API (thanks @jayhickey).
 - Chat UI: keep the chat scrolled to the latest message after switching sessions.
 - Auto-reply: stream completed reply blocks as soon as they finish (configurable default + break); skip empty tool-only blocks unless verbose.
 - Discord: avoid duplicate sends when block streaming is enabled (race with typing hook).