diff --git a/package.json b/package.json
index 3c474a9b52ed0..4135504552dbc 100644
--- a/package.json
+++ b/package.json
@@ -16,7 +16,7 @@
     "url": "https://github.com/gatsbyjs/gatsby/issues"
   },
   "dependencies": {
-    "async": "^1.2.1",
+    "async": "^3.2.2",
     "babel-core": "^6.13.2",
     "babel-loader": "^6.2.5",
     "babel-plugin-add-module-exports": "^0.2.1",
@@ -39,7 +39,7 @@
     "fs-extra": "^0.30.0",
     "glob": "^7.0.5",
     "hapi": "^8.5.1",
-    "hapi-webpack-plugin": "^1.3.0",
+    "hapi-webpack-plugin": "^2.0.0",
     "highlight.js": "^9.6.0",
     "history": "^2.1.2",
     "html-frontmatter": "^1.6.0",
@@ -73,7 +73,7 @@
     "react-hot-loader": "^1.3.0",
     "react-router": "^2.6.1",
     "react-router-scroll": "^0.3.1",
-    "sass-loader": "^3.1.2",
+    "sass-loader": "^6.0.7",
     "slash": "^1.0.0",
     "static-site-generator-webpack-plugin": "^2.1.0",
     "style-loader": "^0.13.0",
@@ -81,7 +81,7 @@
     "toml-loader": "^1.0.0",
     "tracer": "^0.8.3",
     "url-loader": "^0.5.7",
-    "webpack": "^1.13.2",
+    "webpack": "^4.0.0",
     "webpack-configurator": "^0.3.0",
     "webpack-hot-middleware": "^2.12.2",
     "webpack-require": "0.0.16",