diff --git a/src/api/Gemfile b/src/api/Gemfile
index 01491d9e102..1c134129798 100644
--- a/src/api/Gemfile
+++ b/src/api/Gemfile
@@ -60,7 +60,6 @@ gem 'mousetrap-rails'
 # for issue tracker communication
 gem 'xmlrpc'
 # Multiple feature switch
-gem 'feature'
 gem 'flipper'
 gem 'flipper-active_record'
 # for profiling
diff --git a/src/api/Gemfile.lock b/src/api/Gemfile.lock
index 7ab4472c6ac..94fb150e4f9 100644
--- a/src/api/Gemfile.lock
+++ b/src/api/Gemfile.lock
@@ -151,7 +151,6 @@ GEM
       railties (>= 4.2.0)
     faker (1.9.6)
       i18n (>= 0.7)
-    feature (1.4.0)
     ffi (1.11.1)
     flipper (0.16.2)
     flipper-active_record (0.16.2)
@@ -495,7 +494,6 @@ DEPENDENCIES
   experimental-influxdb-rails (>= 1.0.0.beta5)
   factory_bot_rails
   faker
-  feature
   flipper
   flipper-active_record
   flot-rails
diff --git a/src/api/app/controllers/application_controller.rb b/src/api/app/controllers/application_controller.rb
index 2015e3c3d6a..fa3e9758b33 100644
--- a/src/api/app/controllers/application_controller.rb
+++ b/src/api/app/controllers/application_controller.rb
@@ -90,13 +90,6 @@ def self.validate_action(opt)
 
   protected
 
-  # TODO: remove when all the migration from Feature to Flipper is finished.
-  # It'll be replaced by feature_enabled?
-  def feature_active?(feature)
-    return if Feature.active?(feature)
-    render file: Rails.root.join('public/404'), status: :not_found, layout: false
-  end
-
   def validate_params
     params.each do |key, value|
       next if value.nil?
diff --git a/src/api/app/controllers/webui/webui_controller.rb b/src/api/app/controllers/webui/webui_controller.rb
index 6ebfb252c55..1dc9223051e 100644
--- a/src/api/app/controllers/webui/webui_controller.rb
+++ b/src/api/app/controllers/webui/webui_controller.rb
@@ -244,13 +244,6 @@ def require_package
     end
   end
 
-  # TODO: remove when all the migration from Feature to Flipper is finished.
-  # It'll be replaced by feature_enabled?
-  def feature_active?(feature)
-    return if Feature.active?(feature)
-    render file: Rails.root.join('public/404'), status: :not_found, layout: false
-  end
-
   private
 
   def authenticator
diff --git a/src/api/config/initializers/feature.rb b/src/api/config/initializers/feature.rb
deleted file mode 100644
index 94bbf0dc7fd..00000000000
--- a/src/api/config/initializers/feature.rb
+++ /dev/null
@@ -1,3 +0,0 @@
-require_dependency 'feature_switch/obs_repository'
-require_dependency 'feature_switch/feature'
-Feature.set_repository(Feature::Repository::ObsRepository.new("#{Rails.root}/config/feature.yml", Rails.env))
diff --git a/src/api/lib/feature_switch/feature.rb b/src/api/lib/feature_switch/feature.rb
deleted file mode 100644
index ba8a3f7003f..00000000000
--- a/src/api/lib/feature_switch/feature.rb
+++ /dev/null
@@ -1,17 +0,0 @@
-module Feature
-  @perform_initial_refresh_for_user = true
-
-  def self.active?(feature)
-    if User.possibly_nobody.in_beta?
-      # caching the feature.yml file, this is basically taken from Feature.active_features
-      if @auto_refresh || @perform_initial_refresh_for_user || (@next_refresh_after && Time.now > @next_refresh_after)
-        @data = YAML.load_file("#{Rails.root}/config/feature.yml").with_indifferent_access
-        @perform_initial_refresh_for_user = false
-      end
-
-      Repository::ObsRepository::DEFAULTS.merge(@data.dig('beta', 'features') || {}).with_indifferent_access.fetch(feature, false)
-    else
-      active_features.include?(feature)
-    end
-  end
-end
diff --git a/src/api/lib/feature_switch/obs_repository.rb b/src/api/lib/feature_switch/obs_repository.rb
deleted file mode 100644
index 7ea97da4538..00000000000
--- a/src/api/lib/feature_switch/obs_repository.rb
+++ /dev/null
@@ -1,28 +0,0 @@
-module Feature
-  module Repository
-    # ObsRepository for active and inactive features based on YamlRepository having default values for each key in OBS
-    #
-    class ObsRepository < YamlRepository
-      DEFAULTS = {}.freeze
-
-      # Read given file, perform erb evaluation and yaml parsing
-      #
-      # @param file_name [String] the file name fo the yaml config
-      # @return [Hash]
-      #
-      def read_file(file_name)
-        super.with_indifferent_access
-      end
-
-      # Extracts active features from given hash
-      #
-      # @param data [Hash] hash parsed from yaml file
-      # @param selector [String] uses the value for this key as source of feature data
-      #
-      def get_active_features(data, selector)
-        data[@environment]['features'] = DEFAULTS.merge(data[@environment]['features'])
-        super
-      end
-    end
-  end
-end
diff --git a/src/api/spec/rails_helper.rb b/src/api/spec/rails_helper.rb
index 42e9c8a20e5..4058ba75d00 100644
--- a/src/api/spec/rails_helper.rb
+++ b/src/api/spec/rails_helper.rb
@@ -69,9 +69,6 @@
 # helper methods for authentication in models tests
 require 'support/models/models_authentication'
 
-# support feature switch testing
-require 'feature/testing'
-
 # support Delayed Jobs
 require 'support/delayed_job'