diff --git a/README.md b/README.md
index cec6074..a5ec56f 100644
--- a/README.md
+++ b/README.md
@@ -12,14 +12,14 @@ file. Like so:
 <script type="importmap">
   {
     "imports": {
-      "@applura/client": "https://cdn.applura.com/dist/js/client/v2.js"
+      "@applura/client": "https://cdn.applura.com/dist/js/client/v4.js"
     }
   }
 </script>
 <link
   rel="preload"
   as="script"
-  href="https://cdn.applura.com/dist/js/client/v2.js"
+  href="https://cdn.applura.com/dist/js/client/v4.js"
   crossorigin
 />
 ```
diff --git a/package.json b/package.json
index 7652573..209da26 100644
--- a/package.json
+++ b/package.json
@@ -5,7 +5,7 @@
   "description": "A JavaScript client for Applura APIs",
   "main": "index.js",
   "scripts": {
-    "build": "npx rollup index.js --config=rollup.config.cjs --file dist/v2.js",
+    "build": "npx rollup index.js --config=rollup.config.cjs --file dist/v4.js",
     "check": "npm run fmt -- --check && npm run lint && npm test",
     "test": "deno test --allow-net",
     "lint": "deno lint --rules-exclude=no-window",
diff --git a/rollup.config.cjs b/rollup.config.cjs
index 9b80258..39697b9 100644
--- a/rollup.config.cjs
+++ b/rollup.config.cjs
@@ -2,7 +2,7 @@ const { nodeResolve } = require("@rollup/plugin-node-resolve");
 
 module.exports = {
   output: {
-    file: "dist/v2.js",
+    file: "dist/v4.js",
   },
   plugins: [nodeResolve()],
 };
diff --git a/src/client_test.js b/src/client_test.js
index 3680659..69441e1 100644
--- a/src/client_test.js
+++ b/src/client_test.js
@@ -135,7 +135,7 @@ Deno.test("Client", async (t) => {
       assertEquals(resource, undefined);
       assertEquals(
         problem.type,
-        "https://docs.applura.com/client/v2/errors#UnexpectedContentTypeError",
+        "https://docs.applura.com/client/v4/errors#UnexpectedContentTypeError",
       );
       // Get a good response.
       server.respondWith(
@@ -166,7 +166,7 @@ Deno.test("Client", async (t) => {
       assertEquals(resource.id, "200 resource");
       assertEquals(
         problem.type,
-        "https://docs.applura.com/client/v2/errors#UnexpectedContentTypeError",
+        "https://docs.applura.com/client/v4/errors#UnexpectedContentTypeError",
       );
       client.stop();
     });
diff --git a/src/errors.js b/src/errors.js
index 5ece9f3..9c0a28a 100644
--- a/src/errors.js
+++ b/src/errors.js
@@ -6,7 +6,7 @@ export class LibraryError extends Error {
   }
   get detail() {
     return {
-      type: `https://docs.applura.com/client/v2/errors#${this.name}`,
+      type: `https://docs.applura.com/client/v4/errors#${this.name}`,
       title: this.name,
       detail: this.message,
     };