diff --git a/.platform.app.yaml b/.platform.app.yaml
index b6ef908b..ea3555e1 100644
--- a/.platform.app.yaml
+++ b/.platform.app.yaml
@@ -5,7 +5,7 @@
 name: app
 
 # The runtime the application uses.
-type: "php:7.4"
+type: 'php:8.1'
 
 runtime:
     extensions: