diff --git a/db/seeds/development.rb b/db/seeds/development.rb
index ae4e2f00..a1413296 100644
--- a/db/seeds/development.rb
+++ b/db/seeds/development.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 # consumers
 FactoryBot.create(:consumer)
 FactoryBot.create(:consumer, name: 'openSAP')
diff --git a/spec/factories/exercise.rb b/spec/factories/exercise.rb
index 3855a236..20c460cc 100644
--- a/spec/factories/exercise.rb
+++ b/spec/factories/exercise.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'seeds_helper'
 
 def create_seed_file(exercise, path, file_attributes = {})
@@ -53,9 +55,7 @@ FactoryBot.define do
       after(:create) do |exercise, evaluator|
         create_list(:user_exercise_feedback, evaluator.user_feedbacks_count, exercise: exercise)
       end
-
     end
-
   end
 
   factory :even_odd, class: 'Exercise' do
diff --git a/spec/factories/internal_user.rb b/spec/factories/internal_user.rb
index 574e8191..bdde51b0 100644
--- a/spec/factories/internal_user.rb
+++ b/spec/factories/internal_user.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 FactoryBot.define do
   factory :admin, class: 'InternalUser' do
     activated_user