diff --git a/.github/dependabot.yml b/.github/dependabot.yml
new file mode 100644
index 0000000..ae31dd9
--- /dev/null
+++ b/.github/dependabot.yml
@@ -0,0 +1,16 @@
+---
+version: 2
+updates:
+  - package-ecosystem: github-actions
+    directory: /
+    schedule:
+      interval: daily
+      time: "10:00"
+      timezone: Europe/Amsterdam
+  - package-ecosystem: bundler
+    directory: /
+    registries: "*"
+    schedule:
+      interval: daily
+      time: "09:00"
+      timezone: Europe/Amsterdam
diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
new file mode 100644
index 0000000..7fd2262
--- /dev/null
+++ b/.github/workflows/ci.yml
@@ -0,0 +1,15 @@
+name: CI
+on:
+  pull_request:
+    branches:
+      - master
+    # dependabot PRs only have read permission so cannot run this workflow.
+    paths-ignore:
+      - "**/*.md"
+      - ".gitignore"
+      - "README.md"
+      - ".env.example"
+      - "docs/*"
+jobs:
+  validate:
+    uses: ./.github/workflows/validate.yml
diff --git a/.github/workflows/validate.yml b/.github/workflows/validate.yml
new file mode 100644
index 0000000..e5e2df4
--- /dev/null
+++ b/.github/workflows/validate.yml
@@ -0,0 +1,28 @@
+name: Validate
+on:
+  workflow_call:
+
+jobs:
+  validate:
+    name: Validate
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        ruby-version:
+          - '2.6'
+          - '2.7'
+          - '3.0'
+          - '3.2'
+          - '3.3'
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Set up Ruby
+        uses: ruby/setup-ruby@v1
+        with:
+          ruby-version: ${{ matrix.ruby-version }}
+          bundler-cache: true
+
+      - name: Run tests
+        run: |
+          bundle exec rspec
diff --git a/apiculture.gemspec b/apiculture.gemspec
index 3e37ed9..86d3cc8 100644
--- a/apiculture.gemspec
+++ b/apiculture.gemspec
@@ -15,13 +15,7 @@ Gem::Specification.new do |s|
   # Prevent pushing this gem to RubyGems.org.
   # To allow pushes either set the 'allowed_push_host'
   # To allow pushing to a single host or delete this section to allow pushing to any host.
-  if s.respond_to?(:metadata)
-    s.metadata['allowed_push_host'] = 'https://rubygems.org'
-  else
-    raise 'RubyGems 2.0 or newer is required to protect against ' \
-      'public gem pushes.'
-  end
-
+  s.metadata['allowed_push_host'] = 'https://rubygems.org'
   s.files = `git ls-files -z`.split("\x0").reject { |f| f.match(%r{^spec/}) }
   s.extra_rdoc_files = [
     'LICENSE.txt',
diff --git a/gemfiles/Gemfile.rack-1.x b/gemfiles/Gemfile.rack-1.x
deleted file mode 100644
index ed8da16..0000000
--- a/gemfiles/Gemfile.rack-1.x
+++ /dev/null
@@ -1,16 +0,0 @@
-source "http://rubygems.org"
-gem 'rack', "~> 1"
-
-gem 'mustermann', '~> 1'
-gem 'builder', '~> 3'
-gem 'rdiscount', '~> 2'
-gem 'github-markup', '~> 1'
-gem 'mustache', '~> 1'
-
-group :development do
-  gem 'rack-test'
-  gem "rspec", "~> 3"
-  gem "rdoc", "~> 6.0"
-  gem "rake"
-  gem "bundler"
-end
diff --git a/gemfiles/Gemfile.rack-2.x b/gemfiles/Gemfile.rack-2.x
deleted file mode 100644
index b755829..0000000
--- a/gemfiles/Gemfile.rack-2.x
+++ /dev/null
@@ -1,16 +0,0 @@
-source "http://rubygems.org"
-gem 'rack', "~> 2"
-
-gem 'mustermann', '~> 1'
-gem 'builder', '~> 3'
-gem 'rdiscount', '~> 2'
-gem 'github-markup', '~> 1'
-gem 'mustache', '~> 1'
-
-group :development do
-  gem 'rack-test'
-  gem "rspec", "~> 3"
-  gem "rdoc", "~> 6.0"
-  gem "rake"
-  gem "bundler"
-end