diff --git a/CHANGELOG.md b/CHANGELOG.md
index af5c0da4a3..e0f9d775e7 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -7,6 +7,7 @@
 ### Client
 - Fix: 一部の設定検索結果が存在しないパスになる問題を修正  
   (Cherry-picked from https://activitypub.software/TransFem-org/Sharkey/-/merge_requests/1171)
+- Fix: テーマエディタが動作しない問題を修正
 
 ### Server
 - Enhance: ノートの削除処理の効率化
diff --git a/packages/frontend/src/theme.ts b/packages/frontend/src/theme.ts
index e48eb04103..a2658df374 100644
--- a/packages/frontend/src/theme.ts
+++ b/packages/frontend/src/theme.ts
@@ -137,7 +137,8 @@ export function applyTheme(theme: Theme, persist = true) {
 	}
 
 	if (deepEqual(currentTheme, theme)) return;
-	currentTheme = theme;
+	// リアクティビティ解除
+	currentTheme = deepClone(theme);
 
 	if (window.document.startViewTransition != null && prefer.s.animation) {
 		window.document.documentElement.classList.add('_themeChanging_');