diff --git a/preview.yml b/preview.yml
index 2e14ed248f615b00718219540c17167d5be5e5e8..72c68940010225e99ca804a6bb47a7136c0adb00 100644
--- a/preview.yml
+++ b/preview.yml
@@ -1,7 +1,7 @@
 autoOpen: true
 apps:
   - port: 5000
-    command: python app.py
+    command: pip install -r requirements.txt  && python app.py
     root: ./
     name: weather
     description: weather api