diff --git a/package.json b/package.json
index 86042830f..93af10e9e 100644
--- a/package.json
+++ b/package.json
@@ -47,7 +47,7 @@
     "mkdirp": "^0.5.1",
     "postcss-import": "9.1.0",
     "postcss-loader": "1.3.3",
-    "postcss-simple-vars": "3.1.0",
+    "postcss-simple-vars": "4.0.0",
     "prop-types": "15.5.8",
     "react": "15.5.4",
     "react-dom": "15.5.4",