diff --git a/package-lock.json b/package-lock.json
index d4e55888..716a233f 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -5,9 +5,9 @@
   "requires": true,
   "dependencies": {
     "@typescript/vfs": {
-      "version": "1.2.0",
-      "resolved": "https://registry.npmjs.org/@typescript/vfs/-/vfs-1.2.0.tgz",
-      "integrity": "sha512-3YhBC+iyngEHjEedSAWk9rbJHoBwa2cd4h/tzb2TXmZc2CUclTl3x5AQRKNoRqm7t+X9PGTc2q2/Dpray/O4mA==",
+      "version": "1.3.0",
+      "resolved": "https://registry.npmjs.org/@typescript/vfs/-/vfs-1.3.0.tgz",
+      "integrity": "sha512-Bd1LdvQpm0uU2eclcCfO8H8oAGAfEJiKn0acKy/xeZV4sARwXx9MHBMuDX0XDPLmI2JpIm+mFV9Ers65xnoaQg==",
       "dev": true,
       "requires": {
         "debug": "^4.1.1"
@@ -47,9 +47,9 @@
       "dev": true
     },
     "monaco-plugin-helpers": {
-      "version": "1.0.2",
-      "resolved": "https://registry.npmjs.org/monaco-plugin-helpers/-/monaco-plugin-helpers-1.0.2.tgz",
-      "integrity": "sha512-7kUx8dtd5qVNVgUARBRhnM8oftPglYwlINfigC4yGUiuzqtIN22u1tly8umiOCIPR0eFiBLjt6aN23oZh2QJgg==",
+      "version": "1.0.3",
+      "resolved": "https://registry.npmjs.org/monaco-plugin-helpers/-/monaco-plugin-helpers-1.0.3.tgz",
+      "integrity": "sha512-6AYI3ONAy8ki74qG2JqtFrLdiJHQlgeO5l4Rwr0OMyIpGXhc94y5rZuFxOtgGkxgSrZfHSwOt/MulUNZ/mOQOw==",
       "dev": true,
       "requires": {
         "typescript": "^2.7.2"
@@ -82,9 +82,9 @@
       "dev": true
     },
     "source-map-support": {
-      "version": "0.5.16",
-      "resolved": "https://registry.npmjs.org/source-map-support/-/source-map-support-0.5.16.tgz",
-      "integrity": "sha512-efyLRJDr68D9hBBNIPWFjhpFzURh+KJykQwvMyW5UiZzYwoF6l4YMMDIJJEyFWxWCqfyxLzz6tSfUFR+kXXsVQ==",
+      "version": "0.5.19",
+      "resolved": "https://registry.npmjs.org/source-map-support/-/source-map-support-0.5.19.tgz",
+      "integrity": "sha512-Wonm7zOCIJzBGQdB+thsPar0kYuCIzYvxZwlBa87yi/Mdjv7Tip2cyVbLj5o0cFPN4EVkuTwb3GDDyUx2DGnGw==",
       "dev": true,
       "requires": {
         "buffer-from": "^1.0.0",
@@ -92,9 +92,9 @@
       }
     },
     "terser": {
-      "version": "4.6.3",
-      "resolved": "https://registry.npmjs.org/terser/-/terser-4.6.3.tgz",
-      "integrity": "sha512-Lw+ieAXmY69d09IIc/yqeBqXpEQIpDGZqT34ui1QWXIUpR2RjbqEkT8X7Lgex19hslSqcWM5iMN2kM11eMsESQ==",
+      "version": "5.3.0",
+      "resolved": "https://registry.npmjs.org/terser/-/terser-5.3.0.tgz",
+      "integrity": "sha512-XTT3D3AwxC54KywJijmY2mxZ8nJiEjBHVYzq8l9OaYuRFWeQNBwvipuzzYEP4e+/AVcd1hqG/CqgsdIRyT45Fg==",
       "dev": true,
       "requires": {
         "commander": "^2.20.0",
@@ -103,9 +103,9 @@
       }
     },
     "typescript": {
-      "version": "3.8.3",
-      "resolved": "https://registry.npmjs.org/typescript/-/typescript-3.8.3.tgz",
-      "integrity": "sha512-MYlEfn5VrLNsgudQTVJeNaQFUAI7DkhnOjdpAp4T+ku1TfQClewlbSuTVHiA+8skNBgaf02TL/kLOvig4y3G8w==",
+      "version": "3.9.7",
+      "resolved": "https://registry.npmjs.org/typescript/-/typescript-3.9.7.tgz",
+      "integrity": "sha512-BLbiRkiBzAwsjut4x/dsibSTB6yWpwT5qWmC2OfuCg3GgVQCSgMs4vEctYPhsaGtd0AeuuHMkjZ2h2WG8MSzRw==",
       "dev": true
     }
   }
diff --git a/package.json b/package.json
index d2eb1993..b28b507b 100644
--- a/package.json
+++ b/package.json
@@ -20,12 +20,12 @@
     "url": "https://github.com/Microsoft/monaco-typescript/issues"
   },
   "devDependencies": {
-    "@typescript/vfs": "^1.2.0",
+    "@typescript/vfs": "^1.3.0",
     "monaco-editor-core": "^0.20.0",
     "monaco-languages": "^1.10.0",
-    "monaco-plugin-helpers": "^1.0.2",
+    "monaco-plugin-helpers": "^1.0.3",
     "requirejs": "^2.3.6",
-    "terser": "^4.6.3",
+    "terser": "^5.3.0",
     "typescript": "^3.8.2"
   }
 }
diff --git a/scripts/bundle.js b/scripts/bundle.js
index 524c6253..58eb20af 100644
--- a/scripts/bundle.js
+++ b/scripts/bundle.js
@@ -39,13 +39,13 @@ function bundleOne(moduleId, exclude) {
 			'vs/language/typescript': REPO_ROOT + '/release/dev'
 		},
 		optimize: 'none'
-	}, function(buildResponse) {
+	}, async function(buildResponse) {
 		const filePath = path.join(REPO_ROOT, 'release/min/' + moduleId + '.js');
 		const fileContents = fs.readFileSync(filePath).toString();
 		console.log();
 		console.log(`Minifying ${filePath}...`);
-		const result = terser.minify(fileContents);
-		console.log(`Done.`);
+		const result = await terser.minify(fileContents);
+		console.log(`Done minifying ${filePath}.`);
 		fs.writeFileSync(filePath, BUNDLED_FILE_HEADER + result.code);
 	})
 }
diff --git a/src/tsWorker.ts b/src/tsWorker.ts
index c785d75d..aba62fbc 100644
--- a/src/tsWorker.ts
+++ b/src/tsWorker.ts
@@ -259,7 +259,7 @@ export interface ICreateData {
 
 /** The shape of the factory */
 export interface CustomTSWebWorkerFactory {
-	(TSWorkerClass: typeof TypeScriptWorker, ts: typeof import("typescript"), libs: Record<string, string>): typeof TypeScriptWorker
+	(TSWorkerClass: typeof TypeScriptWorker, tsc: typeof ts, libs: Record<string, string>): typeof TypeScriptWorker
 }
 
 export function create(ctx: IWorkerContext, createData: ICreateData): TypeScriptWorker {