diff --git a/yarn.lock b/yarn.lock
index 44f3a00..ca047de 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -614,8 +614,9 @@ cipher-base@^1.0.0, cipher-base@^1.0.1, cipher-base@^1.0.3:
     safe-buffer "^5.0.1"
 
 clean-css@4.1.x:
-  version "4.1.9"
-  resolved "https://registry.yarnpkg.com/clean-css/-/clean-css-4.1.9.tgz#35cee8ae7687a49b98034f70de00c4edd3826301"
+  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"
 
@@ -1515,7 +1516,7 @@ graceful-fs@^4.1.2:
 
 graceful-fs@~3.0.2:
   version "3.0.11"
-  resolved "http://registry.npmjs.org/graceful-fs/-/graceful-fs-3.0.11.tgz#7613c778a1afea62f25c630a086d7f3acbbdd818"
+  resolved "https://registry.npmjs.org/graceful-fs/-/graceful-fs-3.0.11.tgz#7613c778a1afea62f25c630a086d7f3acbbdd818"
   dependencies:
     natives "^1.1.0"
 
@@ -2086,7 +2087,7 @@ locate-path@^2.0.0:
     p-locate "^2.0.0"
     path-exists "^3.0.0"
 
-lodash.get@4.4.2, lodash.get@^4.4.2:
+lodash.get@4.4.2:
   version "4.4.2"
   resolved "https://registry.yarnpkg.com/lodash.get/-/lodash.get-4.4.2.tgz#2d177f652fa31e939b4438d5341499dfa3825e99"