diff --git a/src/client.ts b/src/client.ts
index 90275e7..3964024 100644
--- a/src/client.ts
+++ b/src/client.ts
@@ -1,6 +1,7 @@
 import createOpenApiFetchClient from "openapi-fetch";
 import {
     createAuthMiddleware,
+    createDefaultHeadersMiddleware,
     createVersionPrefixMiddleware,
     defaultTokenCache,
     extractAccountId,
@@ -20,10 +21,11 @@ export const createClient = (options: ClientOptions) => {
     const accountId = extractAccountId(config.audience);
 
     const authMiddleware = createAuthMiddleware(config, core);
+    const headersMiddleware = createDefaultHeadersMiddleware();
     const versionPrefixMiddleware = createVersionPrefixMiddleware();
 
-    core.use(versionPrefixMiddleware, authMiddleware);
-    checkout.use(versionPrefixMiddleware, authMiddleware);
+    core.use(versionPrefixMiddleware, authMiddleware, headersMiddleware);
+    checkout.use(versionPrefixMiddleware, authMiddleware, headersMiddleware);
 
     return { checkout, core, accountId };
 };
diff --git a/src/middleware.ts b/src/middleware.ts
index 6e66747..c1a9821 100644
--- a/src/middleware.ts
+++ b/src/middleware.ts
@@ -1,4 +1,5 @@
 import type { Client, Middleware } from "openapi-fetch";
+import { version } from "../package.json";
 import type { CorePaths } from "./types";
 import type { ClientOptions, TokenCache } from "./types";
 
@@ -102,6 +103,17 @@ export const createAuthMiddleware = (
     };
 };
 
+export const createDefaultHeadersMiddleware = (): Middleware => ({
+    onRequest({ request }) {
+        if (!request.headers.get("User-Agent")) {
+            request.headers.set(
+                "User-Agent",
+                `Dintero.Node.SDK/${version} (+https://github.com/Dintero/Dintero.Node.SDK)`,
+            );
+        }
+    },
+});
+
 export const createVersionPrefixMiddleware = (): Middleware => ({
     async onRequest({ request, schemaPath }) {
         if (schemaPath.startsWith("/v")) {
diff --git a/test/client.test.ts b/test/client.test.ts
index 34b6135..d75e0bc 100644
--- a/test/client.test.ts
+++ b/test/client.test.ts
@@ -1,4 +1,3 @@
-import { afterEach, beforeAll, describe, expect, test } from "@jest/globals";
 import { http, HttpResponse } from "msw";
 import { setupServer } from "msw/node";
 import { createClient } from "../src/client";
diff --git a/tsconfig.json b/tsconfig.json
index a9be69c..38cc260 100644
--- a/tsconfig.json
+++ b/tsconfig.json
@@ -9,6 +9,7 @@
         "strict": true,
         "baseUrl": "./",
         "types": ["jest", "node"],
+        "resolveJsonModule": true,
         "noUnusedLocals": true,
         "skipLibCheck": true,
         "noUncheckedIndexedAccess": true,