diff --git a/package.postcss7.json b/package.postcss7.json
index b6eb6d996b91..b1796bb1e995 100644
--- a/package.postcss7.json
+++ b/package.postcss7.json
@@ -3,11 +3,12 @@
     "cssnano": "^4"
   },
   "dependencies": {
-    "@fullhuman/postcss-purgecss": "^3.1.3",
+    "@fullhuman/postcss-purgecss": "3.0.0",
     "autoprefixer": "^9",
     "postcss": "^7",
     "postcss-functions": "^3",
     "postcss-js": "^2",
-    "postcss-nested": "^4"
+    "postcss-nested": "^4",
+    "purgecss": "3.0.0"
   }
 }