diff --git a/package.json b/package.json
index 6e605be77..2f436f65f 100755
--- a/package.json
+++ b/package.json
@@ -68,6 +68,7 @@
     "trim": "~1.0.1",
     "browserslist": "^4.16.5",
     "ws": "^7.4.6",
+    "css-what": "^5.0.1",
     "trim-newlines": "^3.0.1"
   },
   "config": {
diff --git a/yarn.lock b/yarn.lock
index a4ab466c7..18d3e1c74 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -7459,12 +7459,7 @@ css-url-regex@^1.1.0:
   resolved "https://registry.yarnpkg.com/css-url-regex/-/css-url-regex-1.1.0.tgz#83834230cc9f74c457de59eebd1543feeb83b7ec"
   integrity sha1-g4NCMMyfdMRX3lnuvRVD/uuDt+w=
 
-css-what@^3.2.1:
-  version "3.4.2"
-  resolved "https://registry.yarnpkg.com/css-what/-/css-what-3.4.2.tgz#ea7026fcb01777edbde52124e21f327e7ae950e4"
-  integrity sha512-ACUm3L0/jiZTqfzRM3Hi9Q8eZqd6IK37mMWPLz9PJxkLWllYeRf+EHUSHYEtFop2Eqytaq1FizFVh7XfBnXCDQ==
-
-css-what@^5.0.0:
+css-what@^3.2.1, css-what@^5.0.0, css-what@^5.0.1:
   version "5.0.1"
   resolved "https://registry.yarnpkg.com/css-what/-/css-what-5.0.1.tgz#3efa820131f4669a8ac2408f9c32e7c7de9f4cad"
   integrity sha512-FYDTSHb/7KXsWICVsxdmiExPjCfRC4qRFBdVwv7Ax9hMnvMmEjP9RfxTEZ3qPZGmADDn2vAKSo9UcN1jKVYscg==