diff --git a/.gitignore b/.gitignore
index 44e060a..297db61 100644
--- a/.gitignore
+++ b/.gitignore
@@ -5,7 +5,6 @@
 /Gemfile.lock
 
 /_misc/
-/coverage/
 /spec/dummy/db/*.sqlite3*
 /spec/dummy/log/
 /spec/dummy/storage/
diff --git a/activeadmin_quill_editor.gemspec b/activeadmin_quill_editor.gemspec
index a2f3a7a..19d200e 100644
--- a/activeadmin_quill_editor.gemspec
+++ b/activeadmin_quill_editor.gemspec
@@ -26,6 +26,5 @@ Gem::Specification.new do |spec|
   spec.add_development_dependency 'rspec_junit_formatter', '~> 0.4.1'
   spec.add_development_dependency 'rspec-rails', '~> 4.0.1'
   spec.add_development_dependency 'selenium-webdriver', '~> 3.142.7'
-  spec.add_development_dependency 'simplecov', '~> 0.19.0'
   spec.add_development_dependency 'sqlite3', '~> 1.4.2'
 end
diff --git a/spec/rails_helper.rb b/spec/rails_helper.rb
index 0493988..9eb6e9d 100644
--- a/spec/rails_helper.rb
+++ b/spec/rails_helper.rb
@@ -13,12 +13,6 @@ require 'capybara/rails'
 
 Dir[File.expand_path('support/**/*.rb', __dir__)].sort.each { |f| require f }
 
-require 'simplecov'
-SimpleCov.start :rails do
-  filters.clear
-  add_filter %r{^/spec/}
-end
-
 # Force deprecations to raise an exception.
 ActiveSupport::Deprecation.behavior = :raise