diff --git a/packages/gatsby-plugin-postcss-sass/package.json b/packages/gatsby-plugin-postcss-sass/package.json
index cb7a2a1eb6c7b..18a09861cda29 100644
--- a/packages/gatsby-plugin-postcss-sass/package.json
+++ b/packages/gatsby-plugin-postcss-sass/package.json
@@ -11,7 +11,7 @@
     "extract-text-webpack-plugin": "^1.0.1",
     "gatsby-1-config-css-modules": "^1.0.10",
     "node-sass": "^4.5.2",
-    "sass-loader": "^4.1.1"
+    "sass-loader": "^9.0.0"
   },
   "devDependencies": {
     "babel-cli": "^6.26.0",