diff --git a/yarn.lock b/yarn.lock
index a09e384..7d4b557 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -1107,8 +1107,8 @@ clap@^1.0.9:
     chalk "^1.1.3"
 
 clean-css@4.1.x, clean-css@^4.1.3:
-  version "4.1.7"
-  resolved "https://registry.yarnpkg.com/clean-css/-/clean-css-4.1.7.tgz#b9aea4f85679889cf3eae8b40349ec4ebdfdd032"
+  version "4.1.11"
+  resolved "https://registry.yarnpkg.com/clean-css/-/clean-css-4.1.11.tgz#2ecdf145aba38f54740f26cefd0ff3e03e125d6a"
   dependencies:
     source-map "0.5.x"