diff --git a/package.json b/package.json
index bdab17a2..4255e597 100644
--- a/package.json
+++ b/package.json
@@ -93,7 +93,7 @@
     "karma-webpack": "4.0.2",
     "lodash": "4.17.21",
     "lolex": "1.6.0",
-    "mini-css-extract-plugin": "0.5.0",
+    "mini-css-extract-plugin": "0.12.0",
     "mocha": "3.5.3",
     "nightwatch": "0.9.21",
     "opn": "4.0.2",
diff --git a/yarn.lock b/yarn.lock
index a4e33904..55e9c0db 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -6537,12 +6537,13 @@ min-indent@^1.0.0:
   resolved "https://registry.yarnpkg.com/min-indent/-/min-indent-1.0.1.tgz#a63f681673b30571fbe8bc25686ae746eefa9869"
   integrity sha512-I9jwMn07Sy/IwOj3zVkVik2JTvgpaykDZEigL6Rx6N9LbMywwUSMtxET+7lVoDLLd3O3IXwJwvuuns8UB/HeAg==
 
-mini-css-extract-plugin@0.5.0:
-  version "0.5.0"
-  resolved "https://registry.yarnpkg.com/mini-css-extract-plugin/-/mini-css-extract-plugin-0.5.0.tgz#ac0059b02b9692515a637115b0cc9fed3a35c7b0"
-  integrity sha512-IuaLjruM0vMKhUUT51fQdQzBYTX49dLj8w68ALEAe2A4iYNpIC4eMac67mt3NzycvjOlf07/kYxJDc0RTl1Wqw==
+mini-css-extract-plugin@0.12.0:
+  version "0.12.0"
+  resolved "https://registry.yarnpkg.com/mini-css-extract-plugin/-/mini-css-extract-plugin-0.12.0.tgz#ddeb74fd6304ca9f99c1db74acc7d5b507705454"
+  integrity sha512-z6PQCe9rd1XUwZ8gMaEVwwRyZlrYy8Ba1gRjFP5HcV51HkXX+XlwZ+a1iAYTjSYwgNBXoNR7mhx79mDpOn5fdw==
   dependencies:
     loader-utils "^1.1.0"
+    normalize-url "1.9.1"
     schema-utils "^1.0.0"
     webpack-sources "^1.1.0"
 
@@ -6948,7 +6949,7 @@ normalize-selector@^0.2.0:
   resolved "https://registry.yarnpkg.com/normalize-selector/-/normalize-selector-0.2.0.tgz#d0b145eb691189c63a78d201dc4fdb1293ef0c03"
   integrity sha1-0LFF62kRicY6eNIB3E/bEpPvDAM=
 
-normalize-url@^1.4.0:
+normalize-url@1.9.1, normalize-url@^1.4.0:
   version "1.9.1"
   resolved "https://registry.yarnpkg.com/normalize-url/-/normalize-url-1.9.1.tgz#2cc0d66b31ea23036458436e3620d85954c66c3c"
   dependencies: