diff --git a/.platform.app.yaml b/.platform.app.yaml
index f2b9d449c27f3a430f7c10feb26e11d982842b46..a6def6c062c09959a5c99d0704bbea57e0b464c2 100644
--- a/.platform.app.yaml
+++ b/.platform.app.yaml
@@ -11,7 +11,7 @@ type: 'python:3.7'
 
 # The build-time dependencies of the app.
 dependencies:
-    python:
+    python3:
        pipenv: '*'
 
 # The relationships of the application with services or other applications.