diff --git a/Gemfile b/Gemfile
index 42caf79..0130850 100644
--- a/Gemfile
+++ b/Gemfile
@@ -8,6 +8,6 @@ gemspec
 gem 'pry', '~> 0.13.0'
 gem 'rake', '~> 13.0'
 gem 'rspec', '~> 3.0'
-gem 'rubocop', '~> 0.90.0'
+gem 'rubocop', '~> 0.91.0'
 
 gem 'faker', '~> 2.11'
diff --git a/Gemfile.lock b/Gemfile.lock
index 60934fd..23b66eb 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -40,16 +40,16 @@ GEM
       diff-lcs (>= 1.2.0, < 2.0)
       rspec-support (~> 3.9.0)
     rspec-support (3.9.2)
-    rubocop (0.90.0)
+    rubocop (0.91.0)
       parallel (~> 1.10)
       parser (>= 2.7.1.1)
       rainbow (>= 2.2.2, < 4.0)
       regexp_parser (>= 1.7)
       rexml
-      rubocop-ast (>= 0.3.0, < 1.0)
+      rubocop-ast (>= 0.4.0, < 1.0)
       ruby-progressbar (~> 1.7)
       unicode-display_width (>= 1.4.0, < 2.0)
-    rubocop-ast (0.3.0)
+    rubocop-ast (0.4.0)
       parser (>= 2.7.1.4)
     ruby-progressbar (1.10.1)
     unicode-display_width (1.7.0)
@@ -62,7 +62,7 @@ DEPENDENCIES
   pry (~> 0.13.0)
   rake (~> 13.0)
   rspec (~> 3.0)
-  rubocop (~> 0.90.0)
+  rubocop (~> 0.91.0)
   wag!
 
 BUNDLED WITH