diff --git a/package.json b/package.json
index be171fb..96393cd 100644
--- a/package.json
+++ b/package.json
@@ -30,6 +30,7 @@
   ],
   "scripts": {
     "dev": "esrun --watch src/__playground.ts",
+    "prebuild": "node src/set-version.js",
     "build": "microbundle",
     "prepare": "microbundle",
     "format": "prettier --write . '**/*.{json,md,js,ts,tsx}'",
diff --git a/src/set-version.js b/src/set-version.js
new file mode 100644
index 0000000..4f6a161
--- /dev/null
+++ b/src/set-version.js
@@ -0,0 +1,6 @@
+import packageJson from "../package.json" assert { type: "json" };
+
+const { version } = packageJson;
+
+process.env.PACKAGE_VERSION = version;
+console.log(`ℹ️  Set User-Agent header version variable to ${version}`);
diff --git a/src/utils/internal/call.ts b/src/utils/internal/call.ts
index 5d2ee5f..6f85f42 100644
--- a/src/utils/internal/call.ts
+++ b/src/utils/internal/call.ts
@@ -1,3 +1,5 @@
+const packageVersion = process.env?.["PACKAGE_VERSION"] ?? "Unknown";
+
 /**
  * Fetch an HTTP resource. This is publicly exposed in the
  * event you would like to access an endpoint that this
@@ -13,7 +15,11 @@ export const call = async <
 }) => {
   const { url } = config;
 
-  const rawResponse = await fetch(url);
+  const headers = new Headers({
+    "User-Agent": `RetroAchievements-api-js/${packageVersion}`
+  });
+
+  const rawResponse = await fetch(url, { headers });
 
   if (!rawResponse.ok) {
     throw new Error(