diff --git a/server.js b/server.js
index b4f37aa..fc2910d 100644
--- a/server.js
+++ b/server.js
@@ -26,8 +26,7 @@ fastify.post(
   async (request, reply) => {
     try {
       const {
-        ref,
-        repository: { clone_url: repoUrl },
+        repository: { clone_url: repoUrl, default_branch: branch },
       } = request.body;
 
       const { code } = await execAsync("git rev-parse --git-dir")
@@ -44,8 +43,8 @@ fastify.post(
       // we won't be able to reply later, so do it here
       // this doesn't necessarily imply a successful build though
       // TODO: healthcheck
-      reply.status(200).send("Updated successfully");
-      await execAsync(`git reset --hard ${ref}`);
+      reply.status(200).send("fetched successfully");
+      await execAsync(`git reset --hard origin/${branch}`);
       await execAsync("npm run build");
     } catch (error) {
       reply.status(500).send("Update failed");