diff --git a/modules/tutorial-bookmarking-app/yarn.lock b/modules/tutorial-bookmarking-app/yarn.lock
index 1dc3f5a..94d5972 100644
--- a/modules/tutorial-bookmarking-app/yarn.lock
+++ b/modules/tutorial-bookmarking-app/yarn.lock
@@ -1476,8 +1476,8 @@ css-vendor@^0.3.8:
     is-in-browser "^1.0.2"
 
 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"
 
 cssnano-preset-default@^4.0.0:
   version "4.0.0"