diff --git a/app.json b/app.json
index 48ff6c5e..e37afa69 100644
--- a/app.json
+++ b/app.json
@@ -1,6 +1,6 @@
 {
   "name": "thing",
-  "stack": "heroku-22",
+  "stack": "heroku-26",
   "scripts": {
     "postdeploy": "bundle exec rails db:seed"
   },