diff --git a/Gemfile.lock b/Gemfile.lock
index 6558a1d..c9cfb11 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -6,7 +6,7 @@ PATH
 GEM
   remote: https://rubygems.org/
   specs:
-    ast (2.4.0)
+    ast (2.4.1)
     coderay (1.1.2)
     coveralls (0.8.22)
       json (>= 1.8, < 3)
@@ -16,18 +16,18 @@ GEM
       tins (~> 1.6)
     diff-lcs (1.3)
     docile (1.3.1)
-    jaro_winkler (1.5.1)
     json (2.1.0)
     method_source (0.9.0)
-    parallel (1.12.1)
-    parser (2.5.1.2)
-      ast (~> 2.4.0)
-    powerpack (0.1.2)
+    parallel (1.19.2)
+    parser (2.7.1.4)
+      ast (~> 2.4.1)
     pry (0.11.3)
       coderay (~> 1.1.0)
       method_source (~> 0.9.0)
     rainbow (3.0.0)
     rake (10.5.0)
+    regexp_parser (1.7.1)
+    rexml (3.2.4)
     rspec (3.7.0)
       rspec-core (~> 3.7.0)
       rspec-expectations (~> 3.7.0)
@@ -41,17 +41,20 @@ GEM
       diff-lcs (>= 1.2.0, < 2.0)
       rspec-support (~> 3.7.0)
     rspec-support (3.7.1)
-    rubocop (0.58.1)
-      jaro_winkler (~> 1.5.1)
+    rubocop (0.87.1)
       parallel (~> 1.10)
-      parser (>= 2.5, != 2.5.1.1)
-      powerpack (~> 0.1)
+      parser (>= 2.7.1.1)
       rainbow (>= 2.2.2, < 4.0)
+      regexp_parser (>= 1.7)
+      rexml
+      rubocop-ast (>= 0.1.0, < 1.0)
       ruby-progressbar (~> 1.7)
-      unicode-display_width (~> 1.0, >= 1.0.1)
+      unicode-display_width (>= 1.4.0, < 2.0)
+    rubocop-ast (0.1.0)
+      parser (>= 2.7.0.1)
     rubocop-rspec (1.27.0)
       rubocop (>= 0.56.0)
-    ruby-progressbar (1.9.0)
+    ruby-progressbar (1.10.1)
     simplecov (0.16.1)
       docile (~> 1.1)
       json (>= 1.8, < 3)
@@ -61,7 +64,7 @@ GEM
       tins (~> 1.0)
     thor (0.19.4)
     tins (1.16.3)
-    unicode-display_width (1.4.0)
+    unicode-display_width (1.7.0)
 
 PLATFORMS
   ruby