diff --git a/Optimizer/yarn.lock b/Optimizer/yarn.lock
index 4ae97a6..b0c59d1 100644
--- a/Optimizer/yarn.lock
+++ b/Optimizer/yarn.lock
@@ -943,8 +943,8 @@ css-tree@1.0.0-alpha19:
     source-map "^0.5.3"
 
 css-what@2.1:
-  version "2.1.0"
-  resolved "https://registry.yarnpkg.com/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"
 
 csso@3.1.1:
   version "3.1.1"