diff --git a/.github/workflows/docs.yml b/.github/workflows/docs.yml
new file mode 100644
index 0000000..62e58f8
--- /dev/null
+++ b/.github/workflows/docs.yml
@@ -0,0 +1,20 @@
+name: Docs
+on:
+  push:
+    branches: master
+  pull_request:
+jobs:
+  tests:
+    runs-on: ubuntu-latest
+    steps:
+    - name: Set up Git repository
+      uses: actions/checkout@main
+
+    - name: Set up Ruby
+      uses: ruby/setup-ruby@v1
+      with:
+        ruby-version: '2.7'
+        bundler-cache: true
+
+    - name: Outdated readme check
+      run: bundle exec rake readme:outdated
diff --git a/.github/workflows/tests.yml b/.github/workflows/tests.yml
new file mode 100644
index 0000000..eac71b2
--- /dev/null
+++ b/.github/workflows/tests.yml
@@ -0,0 +1,27 @@
+name: CI
+on:
+  push:
+    branches: master
+  pull_request:
+jobs:
+  tests:
+    strategy:
+      matrix:
+        platform: ["ubuntu-latest", "macos-latest"]
+        ruby: [2.7, 3.0, 3.1, 3.2]
+    runs-on: ${{ matrix.platform }}
+    steps:
+    - name: Set up Git repository
+      uses: actions/checkout@main
+
+    - name: Set up Ruby
+      uses: ruby/setup-ruby@v1
+      with:
+        ruby-version: ${{ matrix.ruby }}
+        bundler-cache: true
+
+    - name: Run linter
+      run: bundle exec rake lint
+
+    - name: Run tests
+      run: bundle exec rake test
diff --git a/Gemfile.lock b/Gemfile.lock
index 3bbaf35..a23025d 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -68,7 +68,7 @@ GEM
     unicode_utils (1.4.0)
 
 PLATFORMS
-  x86_64-darwin-19
+  ruby
 
 DEPENDENCIES
   atlasq!
diff --git a/Rakefile b/Rakefile
index dc5fbd5..e1202c9 100644
--- a/Rakefile
+++ b/Rakefile
@@ -23,16 +23,18 @@ desc "Shortcut for `rake rubocop:autocorrect`"
 task fix: :"rubocop:autocorrect"
 
 namespace "readme" do
+  desc "Check if the readme needs to be regenerated"
   task :outdated do
     Tempfile.open("readme") do |file|
-      sh "bin/generate_readme > #{ file.path }"
-      sh "diff -q README.md #{ file.path }"
+      sh "bin/generate_readme > #{file.path}"
+      sh "diff -q README.md #{file.path}"
     end
   end
 
+  desc "Regenerate the readme"
   task :generate do
     Tempfile.open("readme") do |file|
-      sh "bin/generate_readme > #{ file.path }"
+      sh "bin/generate_readme > #{file.path}"
       mv file.path, "README.md"
     end
   end
diff --git a/bin/generate_readme b/bin/generate_readme
index 8f927bb..925679b 100755
--- a/bin/generate_readme
+++ b/bin/generate_readme
@@ -22,13 +22,13 @@ puts <<~README
   Query for country info at the command line.
 
   ```console
-  #{ atlasq }
+  #{atlasq}
   ```
 
   ## Documentation
 
   ```console
-  #{ atlasq "--help" }
+  #{atlasq "--help"}
   ```
 
   ## Examples
@@ -36,39 +36,39 @@ puts <<~README
   ### Countries
 
   ```console
-  #{ atlasq "--country", "418" }
+  #{atlasq "--country", "418"}
   ```
 
   ```console
-  #{ atlasq "--country", "AM" }
+  #{atlasq "--country", "AM"}
   ```
 
   ```console
-  #{ atlasq "--country", "honduras" }
+  #{atlasq "--country", "honduras"}
   ```
 
   ### Regions
 
   ```console
-  #{ atlasq "--region", "melanesia" }
+  #{atlasq "--region", "melanesia"}
   ```
 
   ```console
-  #{ atlasq "--region", "antarctica" }
+  #{atlasq "--region", "antarctica"}
   ```
 
   ### Currencies
 
   ```console
-  #{ atlasq "--money", "ANG" }
+  #{atlasq "--money", "ANG"}
   ```
 
   ```console
-  #{ atlasq "--money", "฿" }
+  #{atlasq "--money", "฿"}
   ```
 
   ```console
-  #{ atlasq "--money", "Surinamese Dollar" }
+  #{atlasq "--money", "Surinamese Dollar"}
   ```
 
   ## Development
diff --git a/exe/atlasq b/exe/atlasq
index 6d5573b..2cb11d2 100755
--- a/exe/atlasq
+++ b/exe/atlasq
@@ -5,6 +5,9 @@ debug = true if ARGV.delete("-d")
 debug = true if ARGV.delete("--debug")
 ENV["ATLASQ_DEBUG"] = "1" if debug
 
+# Avoid warnings on Ruby 2.7 related to pattern matching.
+Warning[:experimental] = false
+
 $LOAD_PATH.unshift File.expand_path("../lib", __dir__)
 require "atlasq"
 
diff --git a/test/test_helper.rb b/test/test_helper.rb
index 8211a0d..a5033c6 100644
--- a/test/test_helper.rb
+++ b/test/test_helper.rb
@@ -1,5 +1,6 @@
 # frozen_string_literal: true
 
+# Avoid accidental debug output causing test failures.
 ENV.delete("ATLASQ_DEBUG")
 
 $LOAD_PATH.unshift File.expand_path("../lib", __dir__)