diff --git a/packages/agentctx/test/version.test.ts b/packages/agentctx/test/version.test.ts
new file mode 100644
index 0000000..5c3dda7
--- /dev/null
+++ b/packages/agentctx/test/version.test.ts
@@ -0,0 +1,13 @@
+import { readFileSync } from "node:fs";
+import { describe, expect, it } from "vitest";
+import { VERSION } from "../src/version.js";
+
+describe("VERSION", () => {
+  it("matches package.json", () => {
+    const packageJson = JSON.parse(
+      readFileSync(new URL("../package.json", import.meta.url), "utf8"),
+    ) as { version: string };
+
+    expect(VERSION).toBe(packageJson.version);
+  });
+});