diff --git a/Gemfile.lock b/Gemfile.lock
index 9e9a32c..43994a2 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -2,6 +2,9 @@ GEM
   remote: https://rubygems.org/
   specs:
     addressable (2.3.6)
+    ast (2.0.0)
+    astrolabe (1.3.0)
+      parser (>= 2.2.0.pre.3, < 3.0)
     colorize (0.7.4)
     descendants_tracker (0.0.4)
       thread_safe (~> 0.3, >= 0.3.1)
@@ -29,8 +32,19 @@ GEM
       multi_json (~> 1.3)
       multi_xml (~> 0.5)
       rack (~> 1.2)
+    parser (2.2.0.3)
+      ast (>= 1.1, < 3.0)
+    powerpack (0.1.0)
     rack (1.5.2)
+    rainbow (2.0.0)
     rake (10.4.2)
+    rubocop (0.29.1)
+      astrolabe (~> 1.3)
+      parser (>= 2.2.0.1, < 3.0)
+      powerpack (~> 0.1)
+      rainbow (>= 1.99.1, < 3.0)
+      ruby-progressbar (~> 1.4)
+    ruby-progressbar (1.7.5)
     thread_safe (0.3.4)
 
 PLATFORMS
@@ -40,3 +54,4 @@ DEPENDENCIES
   colorize
   github_api
   rake
+  rubocop