diff --git a/package-lock.json b/package-lock.json
index dd2fa9b..6e01682 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -8423,9 +8423,9 @@
       "dev": true
     },
     "style-loader": {
-      "version": "0.21.0",
-      "resolved": "https://registry.npmjs.org/style-loader/-/style-loader-0.21.0.tgz",
-      "integrity": "sha512-T+UNsAcl3Yg+BsPKs1vd22Fr8sVT+CJMtzqc6LEw9bbJZb43lm9GoeIfUcDEefBSWC0BhYbcdupV1GtI4DGzxg==",
+      "version": "0.22.1",
+      "resolved": "https://registry.npmjs.org/style-loader/-/style-loader-0.22.1.tgz",
+      "integrity": "sha512-WXUrLeinPIR1Oat3PfCDro7qTniwNTJqGqv1KcQiL3JR5PzrVLTyNsd9wTsPXG/qNCJ7lzR2NY/QDjFsP7nuSQ==",
       "dev": true,
       "requires": {
         "loader-utils": "1.1.0",
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",