find versions of webpack, webpack-cli, and karma-webpack which work together atm

package.json

@@ -64,8 +64,8 @@
     "babel-runtime": "^6.11.6",
     "bluebird": "^3.5.0",
     "browser-request": "^0.3.3",
-    "extract-text-webpack-plugin": "^4.0.0-beta.0",
     "draft-js": "^0.11.0-alpha",
+    "extract-text-webpack-plugin": "^4.0.0-beta.0",
     "favico.js": "^0.3.10",
     "gemini-scrollbar": "matrix-org/gemini-scrollbar#b302279",
     "gfm.css": "^1.1.1",
@@ -85,7 +85,7 @@
     "babel-cli": "^6.5.2",
     "babel-core": "^6.14.0",
     "babel-eslint": "^6.1.0",
-    "babel-loader": "^7.1.4",
+    "babel-loader": "^7.1.5",
     "babel-plugin-add-module-exports": "^0.2.1",
     "babel-plugin-transform-async-to-bluebird": "^1.1.1",
     "babel-plugin-transform-class-properties": "^6.16.0",
@@ -122,7 +122,7 @@
     "karma-sourcemap-loader": "^0.3.7",
     "karma-spec-reporter": "0.0.31",
     "karma-summary-reporter": "^1.3.3",
-    "karma-webpack": "^v4.0.0-beta.0",
+    "karma-webpack": "^3.0.5",
     "matrix-mock-request": "^1.2.0",
     "matrix-react-test-utils": "^0.2.0",
     "minimist": "^1.2.0",
@@ -130,10 +130,10 @@
     "mocha": "^2.4.5",
     "postcss-extend": "^1.0.5",
     "postcss-import": "^11.1.0",
-    "postcss-loader": "^2.1.4",
+    "postcss-loader": "^2.1.6",
     "postcss-mixins": "^6.2.0",
     "postcss-nested": "^3.0.0",
-    "postcss-scss": "^1.0.5",
+    "postcss-scss": "^1.0.6",
     "postcss-simple-vars": "^4.1.0",
     "postcss-strip-inline-comments": "^0.1.5",
     "raw-loader": "^0.5.1",
@@ -141,9 +141,9 @@
     "react-addons-test-utils": "^15.6.0",
     "rimraf": "^2.4.3",
     "source-map-loader": "^0.2.3",
-    "webpack": "^4.6.0",
-    "webpack-cli": "^2.0.15",
-    "webpack-dev-server": "^3.1.3"
+    "webpack": "^4.20.2",
+    "webpack-cli": "^3.1.1",
+    "webpack-dev-server": "^3.1.9"
   },
   "optionalDependencies": {
     "olm": "https://matrix.org/packages/npm/olm/olm-2.2.1.tgz"