diff --git a/package-lock.json b/package-lock.json
index 77ed8a4..9d50682 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -7007,9 +7007,9 @@
       "integrity": "sha1-yrEPtJCeRByChC6v4a1kbIGARBA="
     },
     "typescript": {
-      "version": "2.3.4",
-      "resolved": "https://registry.npmjs.org/typescript/-/typescript-2.3.4.tgz",
-      "integrity": "sha1-PTgyGCgjHkNPKHUUlZw3qCtin0I=",
+      "version": "2.4.0",
+      "resolved": "https://registry.npmjs.org/typescript/-/typescript-2.4.0.tgz",
+      "integrity": "sha1-rvWo1AS+ujatM5q/B53d3/+6ht0=",
       "dev": true
     },
     "uglify-js": {
diff --git a/package.json b/package.json
index cfc1afa..00d0dc2 100644
--- a/package.json
+++ b/package.json
@@ -80,7 +80,7 @@
     "ts-helpers": "^1.1.2",
     "tslint": "^5.4.3",
     "tslint-loader": "^3.4.3",
-    "typescript": "^2.3.4",
+    "typescript": "^2.4.0",
     "url-loader": "^0.5.8",
     "webpack": "^3.0.0",
     "webpack-dev-server": "^2.5.0",
diff --git a/web/app/shared/scalar.service.ts b/web/app/shared/scalar.service.ts
index abb2cbb..7d57ba1 100644
--- a/web/app/shared/scalar.service.ts
+++ b/web/app/shared/scalar.service.ts
@@ -40,7 +40,7 @@ export class ScalarService {
         this.callAction("close_scalar", {});
     }
 
-    private callAction(action, payload) {
+    private callAction(action, payload): Promise<any> {
         let requestKey = randomString({length: 20});
         return new Promise((resolve, reject) => {
             if (!window.opener) {
diff --git a/webpack.config.js b/webpack.config.js
index 14ae6af..4ac4b0b 100644
--- a/webpack.config.js
+++ b/webpack.config.js
@@ -121,6 +121,7 @@ module.exports = function () {
     config.devServer = {
         contentBase: './web/public',
         historyApiFallback: true,
+        disableHostCheck: true,
         quiet: true,
         stats: 'minimal',
         proxy: {