diff --git a/pantheon.upstream.yml b/pantheon.upstream.yml
index 5d2decf4af..5baa953829 100644
--- a/pantheon.upstream.yml
+++ b/pantheon.upstream.yml
@@ -3,7 +3,7 @@
 # Override the defaults specified here in a site-specific `pantheon.yml` file.
 # For more information see: https://pantheon.io/docs/pantheon-upstream-yml
 api_version: 1
-php_version: 7.4
+php_version: 8.1
 drush_version: 8
 
 # See https://pantheon.io/docs/pantheon-yml#specify-a-version-of-mariadb