diff --git a/extension-gate/package.json b/extension-gate/package.json
index 15fefbc..c444378 100644
--- a/extension-gate/package.json
+++ b/extension-gate/package.json
@@ -26,7 +26,7 @@
     "test": "echo \"This is only an interface, no tests necessary.\" && exit 0"
   },
   "dependencies": {
-    "@lumino/coreutils": "^1.4.2"
+    "@lumino/coreutils": "^1.4.2 || ^2.0.0"
   },
   "devDependencies": {
     "rimraf": "~3.0.0",
diff --git a/extension-gate/tsconfig.json b/extension-gate/tsconfig.json
index 9ff699a..9897917 100644
--- a/extension-gate/tsconfig.json
+++ b/extension-gate/tsconfig.json
@@ -1,26 +1,23 @@
 {
-  "$schema": "http://json.schemastore.org/tsconfig",
   "compilerOptions": {
-    "strict": true,
-    "outDir": "lib",
-    "rootDir": "src",
     "allowSyntheticDefaultImports": true,
     "composite": true,
     "declaration": true,
     "esModuleInterop": true,
     "incremental": true,
     "jsx": "react",
-    "module": "commonjs",
+    "module": "esnext",
     "moduleResolution": "node",
     "noEmitOnError": true,
     "noImplicitAny": true,
     "noUnusedLocals": true,
     "preserveWatchOutput": true,
     "resolveJsonModule": true,
-    "sourceMap": true,
+    "outDir": "lib",
+    "rootDir": "src",
+    "strict": true,
     "strictNullChecks": true,
-    "target": "es2017",
-    "types": []
+    "target": "ES2018"
   },
   "include": ["src/*"]
 }