diff --git a/gulp/package.json b/gulp/package.json
index 49118c32..90dc5501 100644
--- a/gulp/package.json
+++ b/gulp/package.json
@@ -42,6 +42,7 @@
         "markdown-loader": "^5.1.0",
         "node-sri": "^1.1.1",
         "phonegap-plugin-mobile-accessibility": "^1.0.5",
+        "postcss": ">=5.0.0",
         "promise-polyfill": "^8.1.0",
         "query-string": "^6.8.1",
         "rusha": "^0.8.13",
diff --git a/gulp/yarn.lock b/gulp/yarn.lock
index 61c19815..c172cbab 100644
--- a/gulp/yarn.lock
+++ b/gulp/yarn.lock
@@ -8577,10 +8577,10 @@ nan@^2.12.1, nan@^2.13.2:
   resolved "https://registry.yarnpkg.com/nan/-/nan-2.14.0.tgz#7818f722027b2459a86f0295d434d1fc2336c52c"
   integrity sha512-INOFj37C7k3AfaNTtX8RhsTw7qRy7eLET14cROi9+5HAVbbHuIWUHEauBv5qT4Av2tWasiTY1Jw6puUNqRJXQg==
 
-nanoid@^3.1.12:
-  version "3.1.12"
-  resolved "https://registry.yarnpkg.com/nanoid/-/nanoid-3.1.12.tgz#6f7736c62e8d39421601e4a0c77623a97ea69654"
-  integrity sha512-1qstj9z5+x491jfiC4Nelk+f8XBad7LN20PmyWINJEMRSf3wcAjAWysw1qaA8z6NSKe2sjq1hRSDpBH5paCb6A==
+nanoid@^3.1.16:
+  version "3.1.16"
+  resolved "https://registry.yarnpkg.com/nanoid/-/nanoid-3.1.16.tgz#b21f0a7d031196faf75314d7c65d36352beeef64"
+  integrity sha512-+AK8MN0WHji40lj8AEuwLOvLSbWYApQpre/aFJZD71r43wVRLrOYS4FmJOPQYon1TqB462RzrrxlfA74XRES8w==
 
 nanomatch@^1.2.9:
   version "1.2.13"
@@ -10362,6 +10362,16 @@ postcss-zindex@^4.0.1:
     postcss "^7.0.0"
     uniqs "^2.0.0"
 
+postcss@>=5.0.0:
+  version "8.1.7"
+  resolved "https://registry.yarnpkg.com/postcss/-/postcss-8.1.7.tgz#ff6a82691bd861f3354fd9b17b2332f88171233f"
+  integrity sha512-llCQW1Pz4MOPwbZLmOddGM9eIJ8Bh7SZ2Oj5sxZva77uVaotYDsYTch1WBTNu7fUY0fpWp0fdt7uW40D4sRiiQ==
+  dependencies:
+    colorette "^1.2.1"
+    line-column "^1.0.2"
+    nanoid "^3.1.16"
+    source-map "^0.6.1"
+
 postcss@^5.0.2:
   version "5.2.18"
   resolved "https://registry.yarnpkg.com/postcss/-/postcss-5.2.18.tgz#badfa1497d46244f6390f58b319830d9107853c5"
@@ -10390,16 +10400,6 @@ postcss@^7.0.0, postcss@^7.0.1, postcss@^7.0.14, postcss@^7.0.17, postcss@^7.0.2
     source-map "^0.6.1"
     supports-color "^6.1.0"
 
-postcss@^8.1.1:
-  version "8.1.1"
-  resolved "https://registry.yarnpkg.com/postcss/-/postcss-8.1.1.tgz#c3a287dd10e4f6c84cb3791052b96a5d859c9389"
-  integrity sha512-9DGLSsjooH3kSNjTZUOt2eIj2ZTW0VI2PZ/3My+8TC7KIbH2OKwUlISfDsf63EP4aiRUt3XkEWMWvyJHvJelEg==
-  dependencies:
-    colorette "^1.2.1"
-    line-column "^1.0.2"
-    nanoid "^3.1.12"
-    source-map "^0.6.1"
-
 prelude-ls@~1.1.2:
   version "1.1.2"
   resolved "https://registry.yarnpkg.com/prelude-ls/-/prelude-ls-1.1.2.tgz#21932a549f5e52ffd9a827f570e04be62a97da54"