diff --git a/railties/lib/rails/generators/rails/app/templates/.devcontainer/compose.yaml.tt b/railties/lib/rails/generators/rails/app/templates/.devcontainer/compose.yaml.tt
index f365e30d005d8..d2ac57046ae62 100644
--- a/railties/lib/rails/generators/rails/app/templates/.devcontainer/compose.yaml.tt
+++ b/railties/lib/rails/generators/rails/app/templates/.devcontainer/compose.yaml.tt
@@ -1,3 +1,4 @@
+version: "3.8"
 name: "<%= app_name %>"
 
 services: