diff --git a/CHANGELOG.md b/CHANGELOG.md
index 1d7d79c..57dcdf8 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -4,7 +4,7 @@ All notable changes to this project will be documented in this file.
 
 ## Unreleased
 
-## 1.9.1 - 2026-07-18
+## 1.10.0 - 2026-07-18
 
 - Added `runtime.ultraReasoningEffort` to override Ultra's default `max` inference effort with `low`, `medium`, `high`, or `xhigh`.
 - Aligned Ultra's multi-agent mode prompt and inherited child policy with official Codex Multi-Agent V2 behavior.