diff --git a/package.json b/package.json
index e920284..1b8ea3e 100644
--- a/package.json
+++ b/package.json
@@ -48,7 +48,7 @@
     "redux-promise": "^0.6.0",
     "sass-loader": "^7.1.0",
     "sinon-chrome": "^2.3.2",
-    "style-loader": "^0.21.0",
+    "style-loader": "^0.22.0",
     "web-ext": "github:ueokande/web-ext#patched-2.7.0",
     "webextensions-api-fake": "^0.5.1",
     "webpack": "^4.20.2",