diff --git a/.sandbox/manifest.yaml b/.sandbox/manifest.yaml
index e30d5c6..8b6f1a5 100644
--- a/.sandbox/manifest.yaml
+++ b/.sandbox/manifest.yaml
@@ -1,4 +1,6 @@
 hooks:
+  post-checkout:
+    cmd: npm install
   build:
     cmd: npm run build