diff --git a/package.json b/package.json
index 7d6359e..8063284 100644
--- a/package.json
+++ b/package.json
@@ -16,7 +16,7 @@
   },
   "dependencies": {
     "css-selector-tokenizer": "^0.7.0",
-    "postcss": "^6.0.1"
+    "postcss": "^7.0.0"
   },
   "devDependencies": {
     "chokidar-cli": "^1.0.1",