diff --git a/vitest.config.mts b/vitest.config.mts
new file mode 100644
index 0000000..8a955aa
--- /dev/null
+++ b/vitest.config.mts
@@ -0,0 +1,8 @@
+import { defineConfig } from 'vitest/config';
+import mainPackage from './package.json' with { type: 'json' };
+
+export default defineConfig({
+  define: {
+    __PKG_VERSION__: JSON.stringify(mainPackage.version),
+  },
+});