diff --git a/.github/workflows/tests.yml b/.github/workflows/tests.yml
index 76ec88f..b341dcf 100644
--- a/.github/workflows/tests.yml
+++ b/.github/workflows/tests.yml
@@ -29,7 +29,7 @@ jobs:
       - name: Setup Ruby
         uses: ruby/setup-ruby@v1
         with:
-          ruby-version: "3.1.7"
+          ruby-version: "3.3.12"
       - uses: actions/setup-node@v3
         with:
           node-version: 14
@@ -73,7 +73,7 @@ jobs:
       - name: Setup Ruby
         uses: ruby/setup-ruby@v1
         with:
-          ruby-version: "3.1.7"
+          ruby-version: "3.3.12"
       - uses: actions/setup-node@v3
         with:
           node-version: 14
diff --git a/.tool-versions b/.tool-versions
new file mode 100644
index 0000000..6c3b8a7
--- /dev/null
+++ b/.tool-versions
@@ -0,0 +1 @@
+ruby 3.3.12
diff --git a/Gemfile b/Gemfile
index d2b3388..0fca1d6 100644
--- a/Gemfile
+++ b/Gemfile
@@ -5,7 +5,7 @@ end
 source 'https://rubygems.org'
 git_source(:github) { |repo| "https://github.com/#{repo}.git" }
 
-ruby '3.1.7'
+ruby '3.3.12'
 
 if next?
   gem 'rails', '~> 7.2.0'
@@ -41,6 +41,7 @@ gem 'tzinfo-data', platforms: [:mingw, :mswin, :x64_mingw, :jruby]
 
 group :test do
   gem 'test-unit'
+  gem 'minitest', '~> 5.25'
 end
 
 group :development, :test do
diff --git a/Gemfile.lock b/Gemfile.lock
index 09f6753..e3b24db 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -153,7 +153,9 @@ GEM
       racc (~> 1.4)
     nokogiri (1.18.10-x86_64-linux-gnu)
       racc (~> 1.4)
-    pg (1.2.3)
+    pg (1.6.3-arm64-darwin)
+    pg (1.6.3-x86_64-darwin)
+    pg (1.6.3-x86_64-linux)
     power_assert (2.0.1)
     pp (0.6.3)
       prettyprint
@@ -282,6 +284,7 @@ GEM
 
 PLATFORMS
   arm64-darwin-23
+  arm64-darwin-25
   x86_64-darwin-19
   x86_64-linux
 
@@ -290,6 +293,7 @@ DEPENDENCIES
   foundation-rails
   jbuilder (~> 2.7)
   listen (~> 3.2)
+  minitest (~> 5.25)
   pg (>= 0.18, < 2.0)
   puma (~> 4.1)
   rails (~> 7.1.0)
@@ -301,7 +305,7 @@ DEPENDENCIES
   webpacker (~> 5.0)
 
 RUBY VERSION
-   ruby 3.1.7p261
+   ruby 3.3.12p206
 
 BUNDLED WITH
    2.6.9
diff --git a/Gemfile.next.lock b/Gemfile.next.lock
index e733ac3..5c8f369 100644
--- a/Gemfile.next.lock
+++ b/Gemfile.next.lock
@@ -146,7 +146,9 @@ GEM
       racc (~> 1.4)
     nokogiri (1.18.10-x86_64-linux-gnu)
       racc (~> 1.4)
-    pg (1.2.3)
+    pg (1.6.3-arm64-darwin)
+    pg (1.6.3-x86_64-darwin)
+    pg (1.6.3-x86_64-linux)
     power_assert (2.0.1)
     pp (0.6.3)
       prettyprint
@@ -276,6 +278,7 @@ GEM
 
 PLATFORMS
   arm64-darwin-23
+  arm64-darwin-25
   x86_64-darwin-19
   x86_64-linux
 
@@ -284,6 +287,7 @@ DEPENDENCIES
   foundation-rails
   jbuilder (~> 2.7)
   listen (~> 3.2)
+  minitest (~> 5.25)
   pg (>= 0.18, < 2.0)
   puma (~> 4.1)
   rails (~> 7.2.0)
@@ -295,7 +299,7 @@ DEPENDENCIES
   webpacker (~> 5.0)
 
 RUBY VERSION
-   ruby 3.1.7p261
+   ruby 3.3.12p206
 
 BUNDLED WITH
    2.6.9
diff --git a/app.json b/app.json
index cf70e4e..2c41ec5 100644
--- a/app.json
+++ b/app.json
@@ -1,27 +1,28 @@
 {
   "name": "benchmark.fyi",
-  "description": "",
+  "description": "Benchmark results for Ruby and Rails",
+  "stack": "heroku-26",
   "scripts": {
     "postdeploy": "bundle exec rails db:schema:load"
   },
   "env": {
     "LANG": {
-      "required": true
+      "value": "en_US.UTF-8"
     },
     "RACK_ENV": {
-      "required": true
+      "value": "production"
     },
     "RAILS_ENV": {
-      "required": true
+      "value": "production"
     },
     "RAILS_LOG_TO_STDOUT": {
-      "required": true
+      "value": "enabled"
     },
     "RAILS_SERVE_STATIC_FILES": {
-      "required": true
+      "value": "enabled"
     },
     "SECRET_KEY_BASE": {
-      "required": true
+      "generator": "secret"
     }
   },
   "formation": {
@@ -29,7 +30,11 @@
       "quantity": 1
     }
   },
-  "addons": ["heroku-postgresql"],
+  "addons": [
+    {
+      "plan": "heroku-postgresql:essential-0"
+    }
+  ],
   "buildpacks": [
     {
       "url": "heroku/nodejs"
@@ -38,5 +43,18 @@
       "url": "heroku/ruby"
     }
   ],
-  "stack": "heroku-22"
+  "environments": {
+    "review": {
+      "addons": [
+        {
+          "plan": "heroku-postgresql:essential-0"
+        }
+      ],
+      "formation": {
+        "web": {
+          "quantity": 1
+        }
+      }
+    }
+  }
 }