diff --git a/yarn.lock b/yarn.lock
index da4cc22a..11f61b2d 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -720,8 +720,8 @@ class-utils@^0.3.4:
     static-extend "^0.1.1"
 
 clean-css@4.1.x:
-  version "4.1.6"
-  resolved "https://registry.yarnpkg.com/clean-css/-/clean-css-4.1.6.tgz#5a47beb526994cb4f7bf36188a55ed3b45528f0b"
+  version "4.1.11"
+  resolved "https://registry.yarnpkg.com/clean-css/-/clean-css-4.1.11.tgz#2ecdf145aba38f54740f26cefd0ff3e03e125d6a"
   dependencies:
     source-map "0.5.x"
 
@@ -3563,8 +3563,8 @@ source-map-url@^0.4.0:
   resolved "https://registry.yarnpkg.com/source-map-url/-/source-map-url-0.4.0.tgz#3e935d7ddd73631b97659956d55128e87b5084a3"
 
 source-map@0.5.x, source-map@^0.5.3, source-map@^0.5.6, source-map@~0.5.0, source-map@~0.5.1, source-map@~0.5.3:
-  version "0.5.6"
-  resolved "https://registry.yarnpkg.com/source-map/-/source-map-0.5.6.tgz#75ce38f52bf0733c5a7f0c118d81334a2bb5f412"
+  version "0.5.7"
+  resolved "https://registry.yarnpkg.com/source-map/-/source-map-0.5.7.tgz#8a039d2d1021d22d1ea14c80d8ea468ba2ef3fcc"
 
 source-map@^0.1.41:
   version "0.1.43"