diff --git a/manifest-production.yml b/manifest-production.yml
index 39e34b3f..5d029ce2 100644
--- a/manifest-production.yml
+++ b/manifest-production.yml
@@ -4,7 +4,7 @@ applications:
   buildpack: python_buildpack
   memory: 1024M
   path: .
-  stack: cflinuxfs3
+  stack: cflinuxfs4
   timeout: 180
   routes:
   - route: tock.18f.gov