diff --git a/.yarnrc b/.yarnrc
deleted file mode 100644
index 07e44a9a5b..0000000000
--- a/.yarnrc
+++ /dev/null
@@ -1,3 +0,0 @@
---install.no-lockfile true
---install.check-files true
---add.no-lockfile true
diff --git a/packages/confusing-browser-globals/package.json b/packages/confusing-browser-globals/package.json
index f549c02fc1..df823daaf7 100644
--- a/packages/confusing-browser-globals/package.json
+++ b/packages/confusing-browser-globals/package.json
@@ -16,6 +16,6 @@
     "index.js"
   ],
   "devDependencies": {
-    "jest": "23.5.0"
+    "jest": "23.6.0"
   }
 }
diff --git a/packages/react-dev-utils/package.json b/packages/react-dev-utils/package.json
index 61394095fd..fafcc1a83c 100644
--- a/packages/react-dev-utils/package.json
+++ b/packages/react-dev-utils/package.json
@@ -60,7 +60,7 @@
   },
   "devDependencies": {
     "cross-env": "^5.2.0",
-    "jest": "23.5.0"
+    "jest": "23.6.0"
   },
   "scripts": {
     "test": "cross-env FORCE_COLOR=true jest"
diff --git a/packages/react-error-overlay/package.json b/packages/react-error-overlay/package.json
index abd51987ac..baf48be818 100644
--- a/packages/react-error-overlay/package.json
+++ b/packages/react-error-overlay/package.json
@@ -50,7 +50,7 @@
     "eslint-plugin-react": "7.8.2",
     "flow-bin": "^0.63.1",
     "html-entities": "1.2.1",
-    "jest": "23.5.0",
+    "jest": "23.6.0",
     "jest-fetch-mock": "1.5.0",
     "object-assign": "4.1.1",
     "promise": "8.0.1",
diff --git a/packages/react-scripts/config/webpack.config.prod.js b/packages/react-scripts/config/webpack.config.prod.js
index f36e1de3bc..90fe797a6a 100644
--- a/packages/react-scripts/config/webpack.config.prod.js
+++ b/packages/react-scripts/config/webpack.config.prod.js
@@ -15,6 +15,7 @@ const HtmlWebpackPlugin = require('html-webpack-plugin');
 const TerserPlugin = require('terser-webpack-plugin');
 const MiniCssExtractPlugin = require('mini-css-extract-plugin');
 const OptimizeCSSAssetsPlugin = require('optimize-css-assets-webpack-plugin');
+const safePostCssParser = require('postcss-safe-parser');
 const ManifestPlugin = require('webpack-manifest-plugin');
 const InterpolateHtmlPlugin = require('react-dev-utils/InterpolateHtmlPlugin');
 const SWPrecacheWebpackPlugin = require('sw-precache-webpack-plugin');
@@ -152,7 +153,9 @@ module.exports = {
         cache: true,
         sourceMap: shouldUseSourceMap,
       }),
-      new OptimizeCSSAssetsPlugin({ cssProcessorOptions: { safe: true } }),
+      new OptimizeCSSAssetsPlugin({
+        cssProcessorOptions: { parser: safePostCssParser },
+      }),
     ],
     // Automatically split vendor and commons
     // https://twitter.com/wSokra/status/969633336732905474
diff --git a/packages/react-scripts/package.json b/packages/react-scripts/package.json
index 9e0a4d8c73..fcb6200dc1 100644
--- a/packages/react-scripts/package.json
+++ b/packages/react-scripts/package.json
@@ -23,61 +23,62 @@
   "dependencies": {
     "@babel/core": "7.0.0-beta.46",
     "@babel/runtime": "7.0.0-beta.46",
-    "autoprefixer": "8.5.0",
+    "autoprefixer": "9.1.5",
     "babel-core": "7.0.0-bridge.0",
     "babel-eslint": "8.2.3",
-    "babel-jest": "23.4.2",
+    "babel-jest": "23.6.0",
     "babel-loader": "8.0.0-beta.4",
     "babel-plugin-named-asset-import": "^0.1.0",
     "babel-preset-react-app": "^3.1.1",
-    "bfj": "5.2.0",
+    "bfj": "6.1.1",
     "case-sensitive-paths-webpack-plugin": "2.1.2",
     "chalk": "2.4.1",
     "css-loader": "0.28.11",
-    "dotenv": "5.0.1",
+    "dotenv": "6.0.0",
     "dotenv-expand": "4.2.0",
     "eslint": "4.19.1",
     "eslint-config-react-app": "^2.1.0",
     "eslint-loader": "Timer/eslint-loader#e242479990d520213425a0180e5c749b2e71c1ce",
-    "eslint-plugin-flowtype": "2.46.3",
-    "eslint-plugin-import": "2.11.0",
-    "eslint-plugin-jsx-a11y": "6.0.3",
-    "eslint-plugin-react": "7.8.2",
+    "eslint-plugin-flowtype": "2.50.1",
+    "eslint-plugin-import": "2.14.0",
+    "eslint-plugin-jsx-a11y": "6.1.1",
+    "eslint-plugin-react": "7.11.1",
     "file-loader": "1.1.11",
-    "fs-extra": "5.0.0",
+    "fs-extra": "7.0.0",
     "graphql": "0.13.2",
     "graphql-tag": "2.9.2",
     "html-webpack-plugin": "4.0.0-alpha.2",
     "identity-obj-proxy": "3.0.0",
-    "jest": "23.5.0",
+    "jest": "23.6.0",
     "loader-utils": "1.1.0",
-    "mini-css-extract-plugin": "0.4.0",
+    "mini-css-extract-plugin": "0.4.3",
     "object-assign": "4.1.1",
-    "optimize-css-assets-webpack-plugin": "4.0.1",
-    "postcss-flexbugs-fixes": "3.3.1",
-    "postcss-loader": "2.1.5",
-    "promise": "8.0.1",
+    "optimize-css-assets-webpack-plugin": "5.0.1",
+    "postcss-flexbugs-fixes": "4.1.0",
+    "postcss-loader": "3.0.0",
+    "postcss-safe-parser": "4.0.1",
+    "promise": "8.0.2",
     "raf": "3.4.0",
     "react-dev-utils": "^5.0.0",
-    "resolve": "1.6.0",
-    "sass-loader": "7.0.1",
-    "style-loader": "0.21.0",
+    "resolve": "1.8.1",
+    "sass-loader": "7.1.0",
+    "style-loader": "0.23.0",
     "svgr": "1.9.2",
     "sw-precache-webpack-plugin": "0.11.5",
     "terser-webpack-plugin": "1.1.0",
     "thread-loader": "1.2.0",
-    "url-loader": "1.0.1",
-    "webpack": "4.19.0",
-    "webpack-dev-server": "3.1.7",
-    "webpack-manifest-plugin": "2.0.3",
-    "whatwg-fetch": "2.0.4"
+    "url-loader": "1.1.1",
+    "webpack": "4.19.1",
+    "webpack-dev-server": "3.1.8",
+    "webpack-manifest-plugin": "2.0.4",
+    "whatwg-fetch": "3.0.0"
   },
   "devDependencies": {
     "react": "^16.3.2",
     "react-dom": "^16.3.2"
   },
   "optionalDependencies": {
-    "fsevents": "1.2.0"
+    "fsevents": "1.2.4"
   },
   "browserslist": {
     "development": [