diff --git a/CHANGELOG.md b/CHANGELOG.md
index a0466bff4a..a8e335b5f0 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,8 @@
+## 2025.6.3
+
+### Client
+- Fix: キャッシュを削除しないとクライアントが使用できないことがある問題を修正
+
 ## 2025.6.2
 
 ### Client
diff --git a/package.json b/package.json
index d417630114..11f236fec0 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
 	"name": "misskey",
-	"version": "2025.6.2",
+	"version": "2025.6.3",
 	"codename": "nasubi",
 	"repository": {
 		"type": "git",
diff --git a/packages/frontend-shared/js/i18n.ts b/packages/frontend-shared/js/i18n.ts
index db06ad7f42..25581b969a 100644
--- a/packages/frontend-shared/js/i18n.ts
+++ b/packages/frontend-shared/js/i18n.ts
@@ -72,7 +72,7 @@ export class I18n<T extends ILocale> {
 
 					console.error(`Unexpected locale key: ${String(p)}`);
 
-					return p;
+					return new Proxy({} as any, new Handler<TTarget[keyof TTarget] & ILocale>());
 				}
 			}
 
@@ -141,7 +141,7 @@ export class I18n<T extends ILocale> {
 
 					console.error(`Unexpected locale key: ${String(p)}`);
 
-					return p;
+					return new Proxy((() => p) as any, new Handler<TTarget[keyof TTarget] & ILocale>());
 				}
 			}
 
diff --git a/packages/misskey-js/package.json b/packages/misskey-js/package.json
index b5fc6ff6fa..2a617b1489 100644
--- a/packages/misskey-js/package.json
+++ b/packages/misskey-js/package.json
@@ -1,7 +1,7 @@
 {
 	"type": "module",
 	"name": "misskey-js",
-	"version": "2025.6.2",
+	"version": "2025.6.3",
 	"description": "Misskey SDK for JavaScript",
 	"license": "MIT",
 	"main": "./built/index.js",