diff --git a/package.json b/package.json
index 16b0817..46b5101 100644
--- a/package.json
+++ b/package.json
@@ -4,6 +4,7 @@
     "description": "Integrating mobx with lit-element!",
     "license": "Apache-2.0",
     "repository": "https://github.com/adobe/lit-mobx",
+    "type": "module",
     "main": "lit-mobx.js",
     "module": "lit-mobx.js",
     "keywords": [
diff --git a/web-dev-server.config.js b/web-dev-server.config.js
index 640d760..20f498d 100644
--- a/web-dev-server.config.js
+++ b/web-dev-server.config.js
@@ -1,4 +1,4 @@
-module.exports = {
+export default {
     appIndex: 'demo/index.html',
     open: 'demo/index.html',
     nodeResolve: true,
diff --git a/web-test-runner.config.js b/web-test-runner.config.js
index 9aaa9ff..b538ab5 100644
--- a/web-test-runner.config.js
+++ b/web-test-runner.config.js
@@ -1,6 +1,6 @@
-const { playwrightLauncher } = require('@web/test-runner-playwright');
+import { playwrightLauncher } from '@web/test-runner-playwright';
 
-module.exports = {
+export default {
     files: ['test/**/*.test.js'],
     nodeResolve: true,
     coverage: true,