diff --git a/package.json b/package.json
index 73122fb..5e4b48f 100644
--- a/package.json
+++ b/package.json
@@ -2,6 +2,7 @@
   "name": "portier",
   "version": "0.4.3",
   "description": "Portier client for Node.js",
+  "type": "module",
   "main": "dist/index.js",
   "types": "dist/index.d.ts",
   "repository": {
diff --git a/src/client.ts b/src/client.ts
index 1668662..e01dab7 100644
--- a/src/client.ts
+++ b/src/client.ts
@@ -1,9 +1,9 @@
-import url from "url";
+import url from "node:url";
 import jwa from "jwa";
 import jwkToPem from "jwk-to-pem";
-import querystring from "querystring";
-import AbstractStore from "./store";
-import MemoryStore from "./stores/memory";
+import querystring from "node:querystring";
+import AbstractStore from "./store.js";
+import MemoryStore from "./stores/memory.js";
 
 const rs256 = jwa("RS256");
 
diff --git a/src/index.ts b/src/index.ts
index 3fb1333..be998cb 100644
--- a/src/index.ts
+++ b/src/index.ts
@@ -1,4 +1,4 @@
-export { default as PortierClient } from "./client";
-export { default as AbstractStore } from "./store";
-export { default as MemoryStore } from "./stores/memory";
-export { default as normalize } from "./normalize";
+export { default as PortierClient } from "./client.js";
+export { default as AbstractStore } from "./store.js";
+export { default as MemoryStore } from "./stores/memory.js";
+export { default as normalize } from "./normalize.js";
diff --git a/src/normalize.ts b/src/normalize.ts
index bb10e01..b2e4be4 100644
--- a/src/normalize.ts
+++ b/src/normalize.ts
@@ -1,5 +1,5 @@
-import { isIPv4 } from "net";
-import { domainToASCII } from "url";
+import { isIPv4 } from "node:net";
+import { domainToASCII } from "node:url";
 
 /**
  * Normalize an email address.
diff --git a/src/store.ts b/src/store.ts
index d854d0b..5da4b2a 100644
--- a/src/store.ts
+++ b/src/store.ts
@@ -1,4 +1,4 @@
-import crypto from "crypto";
+import crypto from "node:crypto";
 
 /** Abstract base class for store implementations. */
 export default abstract class AbstractStore {
diff --git a/src/stores/memory.ts b/src/stores/memory.ts
index 7cab9d4..99d66d0 100644
--- a/src/stores/memory.ts
+++ b/src/stores/memory.ts
@@ -1,4 +1,4 @@
-import AbstractStore from "../store";
+import AbstractStore from "../store.js";
 
 /** An in-memory store implementation. */
 export default class MemoryStore extends AbstractStore {
diff --git a/src/stores/redis.ts b/src/stores/redis.ts
index 13b4ce5..4de314a 100644
--- a/src/stores/redis.ts
+++ b/src/stores/redis.ts
@@ -1,4 +1,4 @@
-import AbstractStore from "../store";
+import AbstractStore from "../store.js";
 import type { RedisClientType } from "@redis/client";
 
 /**
diff --git a/test.js b/test.js
index 67a15ab..d8aa593 100644
--- a/test.js
+++ b/test.js
@@ -1,5 +1,5 @@
-const test = require("tape");
-const { normalize } = require(".");
+import test from "tape";
+import { normalize } from "./dist/index.js";
 
 test("normalize", (t) => {
   const valid = [
diff --git a/tsconfig.json b/tsconfig.json
index cecde13..609397a 100644
--- a/tsconfig.json
+++ b/tsconfig.json
@@ -1,16 +1,22 @@
 {
   "compilerOptions": {
-    "target": "ES2017",
-    "module": "commonjs",
-    "lib": ["ES2017"],
+    "lib": ["es2023"],
+    "module": "node16",
+    "target": "es2022",
+
+    "strict": true,
+    "esModuleInterop": true,
+    "skipLibCheck": true,
+    "forceConsistentCasingInFileNames": true,
+    "moduleResolution": "node16",
+
     "declaration": true,
     "rootDir": "src",
     "outDir": "dist",
-    "strict": true,
+
     "noUnusedLocals": true,
     "noUnusedParameters": true,
     "noImplicitReturns": true,
-    "noFallthroughCasesInSwitch": true,
-    "esModuleInterop": true
+    "noFallthroughCasesInSwitch": true
   }
 }