diff --git a/package-lock.json b/package-lock.json
index c865cf5f4..8bb4ff4db 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -2470,9 +2470,9 @@
       }
     },
     "css-what": {
-      "version": "2.1.0",
-      "resolved": "https://registry.npmjs.org/css-what/-/css-what-2.1.0.tgz",
-      "integrity": "sha1-lGfQMsOM+u+58teVASUwYvh/ob0=",
+      "version": "2.1.3",
+      "resolved": "https://registry.npmjs.org/css-what/-/css-what-2.1.3.tgz",
+      "integrity": "sha512-a+EPoD+uZiNfh+5fxw2nO9QwFa6nJe2Or35fGY6Ipw1R3R4AGz1d1TEZrCegvw2YTmZ0jXirGYlzxxpYSHwpEg==",
       "dev": true
     },
     "cssom": {
diff --git a/yarn.lock b/yarn.lock
index 922058ef1..8914cdf6e 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -1688,8 +1688,8 @@ css-tokenize@^1.0.1:
     readable-stream "^1.0.33"
 
 css-what@2.1:
-  version "2.1.0"
-  resolved "https://registry.npmjs.org/css-what/-/css-what-2.1.0.tgz#9467d032c38cfaefb9f2d79501253062f87fa1bd"
+  version "2.1.3"
+  resolved "https://registry.yarnpkg.com/css-what/-/css-what-2.1.3.tgz#a6d7604573365fe74686c3f311c56513d88285f2"
 
 cssom@0.3.x, "cssom@>= 0.3.2 < 0.4.0":
   version "0.3.2"