diff --git a/yarn.lock b/yarn.lock
index ee62e2b..f8178c7 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -1939,9 +1939,9 @@ classnames@^2.2.6:
   integrity sha512-JR/iSQOSt+LQIWwrwEzJ9uk0xfN3mTVYMwt1Ir5mUcSN6pU+V4zQFFaJsclJbPuAUQH+yfWef6tm7l1quW3C8Q==
 
 clean-css@4.1.x:
-  version "4.1.9"
-  resolved "https://registry.yarnpkg.com/clean-css/-/clean-css-4.1.9.tgz#35cee8ae7687a49b98034f70de00c4edd3826301"
-  integrity sha1-Nc7ornaHpJuYA09w3gDE7dOCYwE=
+  version "4.1.11"
+  resolved "https://registry.yarnpkg.com/clean-css/-/clean-css-4.1.11.tgz#2ecdf145aba38f54740f26cefd0ff3e03e125d6a"
+  integrity sha1-Ls3xRaujj1R0DybO/Q/z4D4SXWo=
   dependencies:
     source-map "0.5.x"