diff --git a/src/server.ts b/src/server.ts
index 2d1fd49..1412dc2 100644
--- a/src/server.ts
+++ b/src/server.ts
@@ -120,6 +120,7 @@ type RequestContext = {
       secure: SECURE_COOKIE,
       maxAge: 30 * 24 * 60 * 60 * 1000,
       httpOnly: true,
+      sameSite: 'lax',
     },
   })