diff --git a/package.json b/package.json
index d818866f29c8c..96b4f300b242a 100644
--- a/package.json
+++ b/package.json
@@ -45,7 +45,7 @@
     "@wordpress/data": "2.1.1",
     "@wordpress/date": "2.0.2",
     "@wordpress/deprecated": "2.0.2",
-    "@wordpress/edit-post": "1.0.4",
+    "@wordpress/edit-post": "4.0.0",
     "@wordpress/editor": "4.0.1",
     "@wordpress/element": "2.1.1",
     "@wordpress/hooks": "2.0.2",
@@ -56,7 +56,7 @@
     "@wordpress/rich-text": "1.0.0-beta.1",
     "@wordpress/url": "2.0.2",
     "@wordpress/viewport": "2.0.2",
-    "autoprefixer": "9.2.1",
+    "autoprefixer": "10.0.0",
     "autosize": "4.0.2",
     "babel-loader": "8.0.4",
     "babel-plugin-add-module-exports": "1.0.0",
@@ -83,7 +83,7 @@
     "create-react-class": "15.6.3",
     "creditcards": "3.0.1",
     "cross-env": "5.2.0",
-    "css-loader": "1.0.0",
+    "css-loader": "5.0.0",
     "d3-array": "1.2.4",
     "d3-axis": "1.0.12",
     "d3-scale": "2.1.2",
@@ -152,9 +152,9 @@
     "percentage-regex": "3.0.0",
     "phone": "git+https://github.com/Automattic/node-phone.git#1.0.8",
     "photon": "2.0.1",
-    "postcss-cli": "6.0.1",
-    "postcss-custom-properties": "8.0.8",
-    "postcss-loader": "3.0.0",
+    "postcss-cli": "8.0.0",
+    "postcss-custom-properties": "11.0.0",
+    "postcss-loader": "4.0.0",
     "prismjs": "1.15.0",
     "prop-types": "15.6.2",
     "qrcode.react": "0.8.0",
@@ -175,7 +175,7 @@
     "redux-thunk": "2.3.0",
     "refx": "3.1.1",
     "rememo": "3.0.0",
-    "rtlcss": "2.4.0",
+    "rtlcss": "3.0.0",
     "sass-loader": "7.1.0",
     "social-logos": "2.0.0",
     "socket.io-client": "2.1.1",
@@ -198,7 +198,7 @@
     "webpack-bundle-analyzer": "3.0.3",
     "webpack-cli": "3.1.2",
     "webpack-dev-middleware": "3.4.0",
-    "webpack-rtl-plugin": "1.7.0",
+    "webpack-rtl-plugin": "1.8.0",
     "wpcom": "5.4.2",
     "wpcom-oauth": "0.3.4",
     "wpcom-proxy-request": "5.0.0",