diff --git a/app.json b/app.json
index 487747e..b2940b1 100644
--- a/app.json
+++ b/app.json
@@ -18,5 +18,5 @@
 			"description": "Public IP Address of your Router with PORT number (Ex: http://122.141.133.122:3000)"
 		}
 	},
-	"stack": "heroku-16"
+	"stack": "heroku-20"
 }