diff --git a/ruby/Gemfile b/ruby/Gemfile
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--- /dev/null
+++ b/ruby/Gemfile
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+source 'https://rubygems.org'
+
+gem 'rubocop'
diff --git a/ruby/Gemfile.lock b/ruby/Gemfile.lock
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+++ b/ruby/Gemfile.lock
@@ -0,0 +1,32 @@
+GEM
+  remote: https://rubygems.org/
+  specs:
+    ast (2.4.1)
+    parallel (1.19.2)
+    parser (2.7.2.0)
+      ast (~> 2.4.1)
+    rainbow (3.0.0)
+    regexp_parser (1.8.2)
+    rexml (3.2.4)
+    rubocop (1.1.0)
+      parallel (~> 1.10)
+      parser (>= 2.7.1.5)
+      rainbow (>= 2.2.2, < 4.0)
+      regexp_parser (>= 1.8)
+      rexml
+      rubocop-ast (>= 1.0.1)
+      ruby-progressbar (~> 1.7)
+      unicode-display_width (>= 1.4.0, < 2.0)
+    rubocop-ast (1.1.0)
+      parser (>= 2.7.1.5)
+    ruby-progressbar (1.10.1)
+    unicode-display_width (1.7.0)
+
+PLATFORMS
+  ruby
+
+DEPENDENCIES
+  rubocop
+
+BUNDLED WITH
+   2.1.4