diff --git a/.devcontainer/Dockerfile b/.devcontainer/Dockerfile
index 3f5ed44a1..a9b020b82 100644
--- a/.devcontainer/Dockerfile
+++ b/.devcontainer/Dockerfile
@@ -1,7 +1,7 @@
 FROM mcr.microsoft.com/devcontainers/ruby:3.4-trixie
 
 # Install Rails
-RUN gem install rails:7.0.8
+RUN gem install rails:8.0.5
 
 # Default value to allow debug server to serve content over GitHub Codespace's port forwarding service
 # The value is a comma-separated list of allowed domains
diff --git a/app.json b/app.json
index d419d8547..55ccbe87b 100644
--- a/app.json
+++ b/app.json
@@ -1,6 +1,6 @@
 {
   "name": "growstuff",
-  "stack": "heroku-18",
+  "stack": "heroku-26",
   "description": "Open data project for small-scale food growers",
   "scripts": {
     "postdeploy": "bundle exec rails db:seed"