diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
new file mode 100644
index 0000000..690dcdb
--- /dev/null
+++ b/.github/workflows/build.yml
@@ -0,0 +1,22 @@
+name: build
+on:
+  pull_request:
+  push:
+      branches:
+        - main
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    strategy:
+      fail-fast: false
+      matrix:
+        ruby-version: [3.2, 3.3]
+    steps:
+      - uses: actions/checkout@v4
+        with:
+          show-progress: 'false'
+      - uses: ruby/setup-ruby@v1
+        with:
+          ruby-version: ${{ matrix.ruby-version }}
+          bundler-cache: true # runs `bundle install` and caches installed gems automatically
+      - run: bundle exec rake
diff --git a/.gitignore b/.gitignore
index 46a6f15..b24c99c 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,11 +1,11 @@
 /.bundle/
 /.yardoc
-/Gemfile.lock
 /_yardoc/
 /coverage/
 /doc/
 /pkg/
 /spec/reports/
+/Gemfile.lock
 /tmp/
 *.bundle
 *.so
@@ -14,4 +14,4 @@
 mkmf.log
 *.gem
 .byebug_history
-/vendor/
\ No newline at end of file
+/vendor/
diff --git a/.ruby-version b/.ruby-version
index 34cde56..86fb650 100644
--- a/.ruby-version
+++ b/.ruby-version
@@ -1 +1 @@
-3.2.6
+3.3.7
diff --git a/confg.gemspec b/confg.gemspec
index dc6796c..18b47ee 100644
--- a/confg.gemspec
+++ b/confg.gemspec
@@ -13,7 +13,12 @@ Gem::Specification.new do |spec|
   spec.summary       = "Sets shared variables for applications"
   spec.homepage      = ""
 
-  spec.files         = `git ls-files`.split($INPUT_RECORD_SEPARATOR)
+
+  # Specify which files should be added to the gem when it is released.
+  # The `git ls-files -z` loads the files in the RubyGem that have been added into git.
+  spec.files = Dir.chdir(File.expand_path(__dir__)) do
+    `git ls-files -z`.split("\x0").reject { |f| f.match(%r{^(test)/}) }
+  end
   spec.executables   = spec.files.grep(%r{^bin/}).map { |f| File.basename(f) }
   spec.test_files    = spec.files.grep(%r{^(test|spec|features)/})
   spec.require_paths = ["lib"]
@@ -22,4 +27,6 @@ Gem::Specification.new do |spec|
   spec.add_development_dependency "byebug"
   spec.add_development_dependency "minitest", "~> 5.0"
   spec.add_development_dependency "rake"
+
+  spec.required_ruby_version = ">= 3.2.0"
 end
diff --git a/lib/confg/version.rb b/lib/confg/version.rb
index 7570153..6eac55b 100644
--- a/lib/confg/version.rb
+++ b/lib/confg/version.rb
@@ -2,6 +2,10 @@
 
 module Confg
 
-  VERSION = "3.0.1"
+  MAJOR       = 3
+  MINOR       = 1
+  PATCH       = 0
+  PRERELEASE  = nil
 
+  VERSION = [MAJOR, MINOR, PATCH, PRERELEASE].compact.join(".")
 end