diff --git a/Gemfile b/Gemfile
index 2c530f8eb..c99555433 100644
--- a/Gemfile
+++ b/Gemfile
@@ -140,7 +140,7 @@ group :development, :test do
   gem "rspec-rails", "~> 4.0" # rspec-rails is a testing framework for Rails 3+
   gem "rubocop", "~> 0.93.1", require: false # Automatic Ruby code style checking tool
   gem "rubocop-performance", "~> 1.9", require: false # A collection of RuboCop cops to check for performance optimizations in Ruby code
-  gem "rubocop-rails", "~> 2.8", require: false # Automatic Rails code style checking tool
+  gem "rubocop-rails", "~> 2.9", require: false # Automatic Rails code style checking tool
   gem "rubocop-rspec", "~> 1.44", require: false # Code style checking for RSpec files
   gem "spring", "~> 2.1" # Preloads your application so things like console, rake and tests run faster
   gem "spring-commands-rspec", "~> 1.0" # rspec command for spring
diff --git a/Gemfile.lock b/Gemfile.lock
index 36f76db2f..622f8d2e7 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -639,15 +639,15 @@ GEM
       rubocop-ast (>= 0.6.0)
       ruby-progressbar (~> 1.7)
       unicode-display_width (>= 1.4.0, < 2.0)
-    rubocop-ast (1.2.0)
+    rubocop-ast (1.3.0)
       parser (>= 2.7.1.5)
     rubocop-performance (1.9.1)
       rubocop (>= 0.90.0, < 2.0)
       rubocop-ast (>= 0.4.0)
-    rubocop-rails (2.8.1)
+    rubocop-rails (2.9.1)
       activesupport (>= 4.2.0)
       rack (>= 1.1)
-      rubocop (>= 0.87.0)
+      rubocop (>= 0.90.0, < 2.0)
     rubocop-rspec (1.44.1)
       rubocop (~> 0.87)
       rubocop-ast (>= 0.7.1)
@@ -925,7 +925,7 @@ DEPENDENCIES
   rspec-retry (~> 0.6)
   rubocop (~> 0.93.1)
   rubocop-performance (~> 1.9)
-  rubocop-rails (~> 2.8)
+  rubocop-rails (~> 2.9)
   rubocop-rspec (~> 1.44)
   ruby-prof (~> 1.4)
   rubyzip (~> 2.3)
diff --git a/vendor/cache/rubocop-ast-1.2.0.gem b/vendor/cache/rubocop-ast-1.2.0.gem
deleted file mode 100644
index 3796a2085..000000000
Binary files a/vendor/cache/rubocop-ast-1.2.0.gem and /dev/null differ
diff --git a/vendor/cache/rubocop-ast-1.3.0.gem b/vendor/cache/rubocop-ast-1.3.0.gem
new file mode 100644
index 000000000..4ab76d981
Binary files /dev/null and b/vendor/cache/rubocop-ast-1.3.0.gem differ
diff --git a/vendor/cache/rubocop-rails-2.8.1.gem b/vendor/cache/rubocop-rails-2.8.1.gem
deleted file mode 100644
index 54753b8f1..000000000
Binary files a/vendor/cache/rubocop-rails-2.8.1.gem and /dev/null differ
diff --git a/vendor/cache/rubocop-rails-2.9.1.gem b/vendor/cache/rubocop-rails-2.9.1.gem
new file mode 100644
index 000000000..1f2689cea
Binary files /dev/null and b/vendor/cache/rubocop-rails-2.9.1.gem differ