diff --git a/package.json b/package.json
index 36d0616..f3f2ba1 100644
--- a/package.json
+++ b/package.json
@@ -24,7 +24,7 @@
     "cssnano": "^3.10.0",
     "jsdoc-to-markdown": "^3.0.0",
     "nyc": "^10.1.0",
-    "postcss": "^6.0.3",
+    "postcss": "^6.0.17",
     "postcss-cssnext": "^3.0.0",
     "postcss-import": "^9.1.0",
     "postcss-nested": "^2.0.3",