diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
new file mode 100644
index 0000000..a472663
--- /dev/null
+++ b/.github/workflows/ci.yml
@@ -0,0 +1,26 @@
+name: CI
+on:
+  pull_request:
+    branches:
+      - '**'
+  push:
+    branches:
+      - master
+jobs:
+  build:
+    name: Ruby ${{ matrix.version }} ${{ matrix.gemfile }}
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        ruby: [ '2.7', '3.0', '3.1', '3.2', '3.3' ]
+        gemfile:
+          - Gemfile
+    steps:
+      - uses: actions/checkout@v4
+      - name: Set up Ruby ${{ matrix.version }}
+        uses: ruby/setup-ruby@v1
+        with:
+          ruby-version: ${{ matrix.version }}
+          bundler-cache: true
+      - name: Test
+        run: bundle exec rake test
diff --git a/.gitignore b/.gitignore
index 2ac8271..247384c 100644
--- a/.gitignore
+++ b/.gitignore
@@ -2,4 +2,3 @@ pkg/*
 *.gem
 .bundle
 .DS_Store
-Gemfile.lock
diff --git a/.ruby-version b/.ruby-version
new file mode 100644
index 0000000..a603bb5
--- /dev/null
+++ b/.ruby-version
@@ -0,0 +1 @@
+2.7.5
diff --git a/Gemfile.lock b/Gemfile.lock
new file mode 100644
index 0000000..27e6353
--- /dev/null
+++ b/Gemfile.lock
@@ -0,0 +1,47 @@
+PATH
+  remote: .
+  specs:
+    active_utils (3.4.1)
+      activesupport (>= 4.2)
+      i18n
+
+GEM
+  remote: https://rubygems.org/
+  specs:
+    activesupport (7.1.3.2)
+      base64
+      bigdecimal
+      concurrent-ruby (~> 1.0, >= 1.0.2)
+      connection_pool (>= 2.2.5)
+      drb
+      i18n (>= 1.6, < 2)
+      minitest (>= 5.1)
+      mutex_m
+      tzinfo (~> 2.0)
+    base64 (0.2.0)
+    bigdecimal (3.1.7)
+    concurrent-ruby (1.2.3)
+    connection_pool (2.4.1)
+    drb (2.2.1)
+    i18n (1.14.4)
+      concurrent-ruby (~> 1.0)
+    minitest (5.22.3)
+    mocha (2.1.0)
+      ruby2_keywords (>= 0.0.5)
+    mutex_m (0.2.0)
+    rake (13.2.0)
+    ruby2_keywords (0.0.5)
+    tzinfo (2.0.6)
+      concurrent-ruby (~> 1.0)
+
+PLATFORMS
+  arm64-darwin-21
+
+DEPENDENCIES
+  active_utils!
+  minitest
+  mocha
+  rake
+
+BUNDLED WITH
+   2.4.18
diff --git a/active_utils.gemspec b/active_utils.gemspec
index 185d0c0..cd30355 100644
--- a/active_utils.gemspec
+++ b/active_utils.gemspec
@@ -12,6 +12,8 @@ Gem::Specification.new do |s|
   s.summary     = %q{Common utils used by active_merchant, active_fulfillment, and active_shipping}
   s.license     = 'MIT'
 
+  spec.required_ruby_version = ">= 2.7"
+
   s.rubyforge_project = "active_utils"
 
   s.add_dependency('activesupport', '>= 4.2')