diff --git a/yarn.lock b/yarn.lock
index e22f378..4733c00 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -1167,8 +1167,8 @@ clap@^1.0.9:
     chalk "^1.1.3"
 
 clean-css@4.1.x:
-  version "4.1.8"
-  resolved "https://registry.yarnpkg.com/clean-css/-/clean-css-4.1.8.tgz#061455b2494a750ac98f46d8d5ebb17c679ea9d1"
+  version "4.1.11"
+  resolved "https://registry.yarnpkg.com/clean-css/-/clean-css-4.1.11.tgz#2ecdf145aba38f54740f26cefd0ff3e03e125d6a"
   dependencies:
     source-map "0.5.x"