diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 75f0aea..543236c 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -2,6 +2,20 @@
 name: CI
 on: [ push, pull_request ]
 jobs:
+  rubocop:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+
+      - name: Set up Ruby
+        uses: ruby/setup-ruby@v1
+        with:
+          ruby-version: 3.3
+          bundler-cache: true
+
+      - name: Run RuboCop
+        run: bundle exec rubocop
+
   tests:
     runs-on: ubuntu-latest
     strategy:
diff --git a/.gitignore b/.gitignore
index a8c13c5..931b79b 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,5 +1,5 @@
 *.gem
 .bundle
 pkg/*
-*.lock
+gemfiles/*.lock
 coverage
diff --git a/.rubocop.yml b/.rubocop.yml
new file mode 100644
index 0000000..be1e7af
--- /dev/null
+++ b/.rubocop.yml
@@ -0,0 +1,4 @@
+require:
+  - standard
+  - rubocop-rake
+  - rubocop-rspec
diff --git a/Gemfile b/Gemfile
index e45e8a9..87a39f6 100644
--- a/Gemfile
+++ b/Gemfile
@@ -3,3 +3,6 @@ source "http://rubygems.org"
 # Specify your gem's dependencies in datatrans.gemspec
 gemspec
 gem "simplecov", group: :test, require: nil
+gem "standard", group: :development, require: false
+gem "rubocop-rake", group: :development, require: false
+gem "rubocop-rspec", group: :development, require: false
diff --git a/Gemfile.lock b/Gemfile.lock
new file mode 100644
index 0000000..106e3cc
--- /dev/null
+++ b/Gemfile.lock
@@ -0,0 +1,166 @@
+PATH
+  remote: .
+  specs:
+    datatrans (5.1.0)
+      activesupport (>= 5.2)
+      builder
+      httparty
+      i18n
+      multi_xml (>= 0.5.1)
+
+GEM
+  remote: http://rubygems.org/
+  specs:
+    actionpack (6.1.4.6)
+      actionview (= 6.1.4.6)
+      activesupport (= 6.1.4.6)
+      rack (~> 2.0, >= 2.0.9)
+      rack-test (>= 0.6.3)
+      rails-dom-testing (~> 2.0)
+      rails-html-sanitizer (~> 1.0, >= 1.2.0)
+    actionview (6.1.4.6)
+      activesupport (= 6.1.4.6)
+      builder (~> 3.1)
+      erubi (~> 1.4)
+      rails-dom-testing (~> 2.0)
+      rails-html-sanitizer (~> 1.1, >= 1.2.0)
+    activesupport (6.1.4.6)
+      concurrent-ruby (~> 1.0, >= 1.0.2)
+      i18n (>= 1.6, < 2)
+      minitest (>= 5.1)
+      tzinfo (~> 2.0)
+      zeitwerk (~> 2.3)
+    appraisal (2.4.1)
+      bundler
+      rake
+      thor (>= 0.14.0)
+    ast (2.4.2)
+    builder (3.2.4)
+    concurrent-ruby (1.1.9)
+    crass (1.0.6)
+    diff-lcs (1.5.0)
+    docile (1.4.0)
+    erubi (1.10.0)
+    httparty (0.20.0)
+      mime-types (~> 3.0)
+      multi_xml (>= 0.5.2)
+    i18n (1.10.0)
+      concurrent-ruby (~> 1.0)
+    json (2.7.1)
+    language_server-protocol (3.17.0.3)
+    lint_roller (1.1.0)
+    loofah (2.14.0)
+      crass (~> 1.0.2)
+      nokogiri (>= 1.5.9)
+    mime-types (3.4.1)
+      mime-types-data (~> 3.2015)
+    mime-types-data (3.2022.0105)
+    mini_portile2 (2.8.5)
+    minitest (5.15.0)
+    multi_xml (0.6.0)
+    nokogiri (1.13.3)
+      mini_portile2 (~> 2.8.0)
+      racc (~> 1.4)
+    nokogiri (1.13.3-x86_64-darwin)
+      racc (~> 1.4)
+    nokogiri (1.13.3-x86_64-linux)
+      racc (~> 1.4)
+    parallel (1.24.0)
+    parser (3.3.0.3)
+      ast (~> 2.4.1)
+      racc
+    racc (1.6.0)
+    rack (2.2.3)
+    rack-test (1.1.0)
+      rack (>= 1.0, < 3)
+    rails-dom-testing (2.0.3)
+      activesupport (>= 4.2.0)
+      nokogiri (>= 1.6)
+    rails-html-sanitizer (1.4.2)
+      loofah (~> 2.3)
+    rainbow (3.1.1)
+    rake (13.0.6)
+    regexp_parser (2.9.0)
+    rexml (3.2.6)
+    rspec (3.11.0)
+      rspec-core (~> 3.11.0)
+      rspec-expectations (~> 3.11.0)
+      rspec-mocks (~> 3.11.0)
+    rspec-core (3.11.0)
+      rspec-support (~> 3.11.0)
+    rspec-expectations (3.11.0)
+      diff-lcs (>= 1.2.0, < 2.0)
+      rspec-support (~> 3.11.0)
+    rspec-mocks (3.11.0)
+      diff-lcs (>= 1.2.0, < 2.0)
+      rspec-support (~> 3.11.0)
+    rspec-support (3.11.0)
+    rubocop (1.59.0)
+      json (~> 2.3)
+      language_server-protocol (>= 3.17.0)
+      parallel (~> 1.10)
+      parser (>= 3.2.2.4)
+      rainbow (>= 2.2.2, < 4.0)
+      regexp_parser (>= 1.8, < 3.0)
+      rexml (>= 3.2.5, < 4.0)
+      rubocop-ast (>= 1.30.0, < 2.0)
+      ruby-progressbar (~> 1.7)
+      unicode-display_width (>= 2.4.0, < 3.0)
+    rubocop-ast (1.30.0)
+      parser (>= 3.2.1.0)
+    rubocop-capybara (2.20.0)
+      rubocop (~> 1.41)
+    rubocop-factory_bot (2.25.1)
+      rubocop (~> 1.41)
+    rubocop-performance (1.20.2)
+      rubocop (>= 1.48.1, < 2.0)
+      rubocop-ast (>= 1.30.0, < 2.0)
+    rubocop-rake (0.6.0)
+      rubocop (~> 1.0)
+    rubocop-rspec (2.26.1)
+      rubocop (~> 1.40)
+      rubocop-capybara (~> 2.17)
+      rubocop-factory_bot (~> 2.22)
+    ruby-progressbar (1.13.0)
+    simplecov (0.21.2)
+      docile (~> 1.1)
+      simplecov-html (~> 0.11)
+      simplecov_json_formatter (~> 0.1)
+    simplecov-html (0.12.3)
+    simplecov_json_formatter (0.1.4)
+    standard (1.33.0)
+      language_server-protocol (~> 3.17.0.2)
+      lint_roller (~> 1.0)
+      rubocop (~> 1.59.0)
+      standard-custom (~> 1.0.0)
+      standard-performance (~> 1.3)
+    standard-custom (1.0.2)
+      lint_roller (~> 1.0)
+      rubocop (~> 1.50)
+    standard-performance (1.3.1)
+      lint_roller (~> 1.1)
+      rubocop-performance (~> 1.20.2)
+    thor (1.2.1)
+    tzinfo (2.0.4)
+      concurrent-ruby (~> 1.0)
+    unicode-display_width (2.5.0)
+    zeitwerk (2.5.4)
+
+PLATFORMS
+  ruby
+  x86_64-darwin-22
+  x86_64-linux
+
+DEPENDENCIES
+  actionpack (>= 5.2)
+  appraisal
+  datatrans!
+  rake
+  rspec
+  rubocop-rake
+  rubocop-rspec
+  simplecov
+  standard
+
+BUNDLED WITH
+   2.4.12