diff --git a/packages/postcss/package.json b/packages/postcss/package.json
index 14bbe241f..f910948f4 100644
--- a/packages/postcss/package.json
+++ b/packages/postcss/package.json
@@ -20,7 +20,7 @@
   "dependencies": {
     "css-loader": "^1.0.0",
     "hops-mixin": "^11.6.0",
-    "mini-css-extract-plugin": "^0.5.0",
+    "mini-css-extract-plugin": "^0.6.0",
     "optimize-css-assets-webpack-plugin": "^5.0.0",
     "pathifist": "^1.0.0",
     "postcss-import": "^12.0.0",
diff --git a/yarn.lock b/yarn.lock
index 707ebd54d..9951ad951 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -8099,12 +8099,13 @@ mimic-fn@^2.0.0:
   resolved "https://registry.yarnpkg.com/mimic-fn/-/mimic-fn-2.1.0.tgz#7ed2c2ccccaf84d3ffcb7a69b57711fc2083401b"
   integrity sha512-OqbOk5oEQeAZ8WXWydlu9HJjz9WVdEIvamMCcXmuqUYjTknH/sqsWvhQ3vgwKFRR1HpjvNBKQ37nbJgYzGqGcg==
 
-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@^0.6.0:
+  version "0.6.0"
+  resolved "https://registry.yarnpkg.com/mini-css-extract-plugin/-/mini-css-extract-plugin-0.6.0.tgz#a3f13372d6fcde912f3ee4cd039665704801e3b9"
+  integrity sha512-79q5P7YGI6rdnVyIAV4NXpBQJFWdkzJxCim3Kog4078fM0piAaFlwocqbejdWtLW1cEzCexPrh6EdyFsPgVdAw==
   dependencies:
     loader-utils "^1.1.0"
+    normalize-url "^2.0.1"
     schema-utils "^1.0.0"
     webpack-sources "^1.1.0"
 
@@ -8494,6 +8495,15 @@ normalize-range@^0.1.2:
   resolved "https://registry.yarnpkg.com/normalize-range/-/normalize-range-0.1.2.tgz#2d10c06bdfd312ea9777695a4d28439456b75942"
   integrity sha1-LRDAa9/TEuqXd2laTShDlFa3WUI=
 
+normalize-url@^2.0.1:
+  version "2.0.1"
+  resolved "https://registry.yarnpkg.com/normalize-url/-/normalize-url-2.0.1.tgz#835a9da1551fa26f70e92329069a23aa6574d7e6"
+  integrity sha512-D6MUW4K/VzoJ4rJ01JFKxDrtY1v9wrgzCX5f2qj/lzH1m/lW6MhUZFKerVsnyjOhOsYzI9Kqqak+10l4LvLpMw==
+  dependencies:
+    prepend-http "^2.0.0"
+    query-string "^5.0.1"
+    sort-keys "^2.0.0"
+
 normalize-url@^3.0.0, normalize-url@^3.3.0:
   version "3.3.0"
   resolved "https://registry.yarnpkg.com/normalize-url/-/normalize-url-3.3.0.tgz#b2e1c4dc4f7c6d57743df733a4f5978d18650559"
@@ -9863,6 +9873,11 @@ prelude-ls@~1.1.2:
   resolved "https://registry.yarnpkg.com/prelude-ls/-/prelude-ls-1.1.2.tgz#21932a549f5e52ffd9a827f570e04be62a97da54"
   integrity sha1-IZMqVJ9eUv/ZqCf1cOBL5iqX2lQ=
 
+prepend-http@^2.0.0:
+  version "2.0.0"
+  resolved "https://registry.yarnpkg.com/prepend-http/-/prepend-http-2.0.0.tgz#e92434bfa5ea8c19f41cdfd401d741a3c819d897"
+  integrity sha1-6SQ0v6XqjBn0HN/UAddBo8gZ2Jc=
+
 preserve@^0.2.0:
   version "0.2.0"
   resolved "https://registry.yarnpkg.com/preserve/-/preserve-0.2.0.tgz#815ed1f6ebc65926f865b310c0713bcb3315ce4b"
@@ -10121,6 +10136,15 @@ qs@6.5.2, qs@~6.5.2:
   resolved "https://registry.yarnpkg.com/qs/-/qs-6.5.2.tgz#cb3ae806e8740444584ef154ce8ee98d403f3e36"
   integrity sha512-N5ZAX4/LxJmF+7wN74pUD6qAh9/wnvdQcjq9TZjevvXzSUo7bfmw91saqMjzGS2xq91/odN2dW/WOl7qQHNDGA==
 
+query-string@^5.0.1:
+  version "5.1.1"
+  resolved "https://registry.yarnpkg.com/query-string/-/query-string-5.1.1.tgz#a78c012b71c17e05f2e3fa2319dd330682efb3cb"
+  integrity sha512-gjWOsm2SoGlgLEdAGt7a6slVOk9mGiXmPFMqrEhLQ68rhQuBnpfs3+EmlvqKyxnCo9/PPlF+9MtY02S1aFg+Jw==
+  dependencies:
+    decode-uri-component "^0.2.0"
+    object-assign "^4.1.0"
+    strict-uri-encode "^1.0.0"
+
 querystring-es3@^0.2.0:
   version "0.2.1"
   resolved "https://registry.yarnpkg.com/querystring-es3/-/querystring-es3-0.2.1.tgz#9ec61f79049875707d69414596fd907a4d711e73"
@@ -11312,6 +11336,11 @@ streamsearch@0.1.2:
   resolved "https://registry.yarnpkg.com/streamsearch/-/streamsearch-0.1.2.tgz#808b9d0e56fc273d809ba57338e929919a1a9f1a"
   integrity sha1-gIudDlb8Jz2Am6VzOOkpkZoanxo=
 
+strict-uri-encode@^1.0.0:
+  version "1.1.0"
+  resolved "https://registry.yarnpkg.com/strict-uri-encode/-/strict-uri-encode-1.1.0.tgz#279b225df1d582b1f54e65addd4352e18faa0713"
+  integrity sha1-J5siXfHVgrH1TmWt3UNS4Y+qBxM=
+
 string-argv@^0.0.2:
   version "0.0.2"
   resolved "https://registry.yarnpkg.com/string-argv/-/string-argv-0.0.2.tgz#dac30408690c21f3c3630a3ff3a05877bdcbd736"