diff --git a/packages/gatsby/package.json b/packages/gatsby/package.json
index 204f82960ebae..be2b506c315a4 100644
--- a/packages/gatsby/package.json
+++ b/packages/gatsby/package.json
@@ -17,7 +17,7 @@
     "@babel/runtime": "^7.0.0",
     "@babel/traverse": "^7.0.0",
     "@reach/router": "^1.1.1",
-    "autoprefixer": "^8.6.5",
+    "autoprefixer": "^10.0.0",
     "babel-core": "7.0.0-bridge.0",
     "babel-eslint": "^8.2.2",
     "babel-loader": "8.0.0-beta.4",
@@ -36,7 +36,7 @@
     "convert-hrtime": "^2.0.0",
     "copyfiles": "^1.2.0",
     "core-js": "^2.5.0",
-    "css-loader": "^1.0.0",
+    "css-loader": "^5.0.0",
     "debug": "^3.1.0",
     "del": "^3.0.0",
     "detect-port": "^1.2.1",
@@ -90,11 +90,11 @@
     "null-loader": "^0.1.1",
     "opentracing": "^0.14.3",
     "opn": "^5.3.0",
-    "optimize-css-assets-webpack-plugin": "^5.0.1",
+    "optimize-css-assets-webpack-plugin": "^6.0.0",
     "parse-filepath": "^1.0.1",
     "physical-cpu-count": "^2.0.0",
-    "postcss-flexbugs-fixes": "^3.0.0",
-    "postcss-loader": "^2.1.3",
+    "postcss-flexbugs-fixes": "^5.0.0",
+    "postcss-loader": "^4.0.0",
     "raw-loader": "^0.5.1",
     "react-dev-utils": "^4.2.1",
     "react-error-overlay": "^3.0.0",