diff --git a/src/client/init.ts b/src/client/init.ts
index 32d6c2463c..2c5a45984a 100644
--- a/src/client/init.ts
+++ b/src/client/init.ts
@@ -51,14 +51,6 @@ Vue.mixin({
 
 console.info(`Misskey v${version}`);
 
-// v11互換性のため
-if (localStorage.getItem('kyoppie') === 'yuppie') {
-	const i = localStorage.getItem('i');
-	localStorage.clear();
-	localStorage.setItem('i', i);
-	location.reload(true);
-}
-
 if (localStorage.getItem('theme') == null) {
 	applyTheme(lightTheme);
 }