diff --git a/tests/setup.ts b/tests/setup.ts
new file mode 100644
index 00000000..abb2ead4
--- /dev/null
+++ b/tests/setup.ts
@@ -0,0 +1,5 @@
+import { vi } from 'vitest'
+import { webcrypto } from 'node:crypto'
+
+// Mock the global crypto object to use Node.js webcrypto
+vi.stubGlobal('crypto', webcrypto)
diff --git a/vitest.config.ts b/vitest.config.ts
index cb2d2d32..c4ce30d0 100644
--- a/vitest.config.ts
+++ b/vitest.config.ts
@@ -5,7 +5,8 @@ export default defineConfig({
   test: {
     globals: true,     // so can use `describe`/`it` without importing them
     environment: 'node', 
-    include: ['tests/**/*.test.{js,ts}'], 
+    include: ['tests/**/*.test.{js,ts}'],
+    setupFiles: ['./tests/setup.ts'],
   },
 
   define: {