diff --git a/packages/i18n/strings/ja.json b/packages/i18n/strings/ja.json
index ecce0600b..11209711e 100644
--- a/packages/i18n/strings/ja.json
+++ b/packages/i18n/strings/ja.json
@@ -433,9 +433,6 @@
           "model": {
             "name": "モデル"
           },
-          "skins": {
-            "unreleased": "Unreleased"
-          },
           "dynamic": {
             "name": "貫通テスト",
             "custom_shell": {