diff --git a/app/controllers/exercises_controller.rb b/app/controllers/exercises_controller.rb
index 257d9fe6..2fc49897 100644
--- a/app/controllers/exercises_controller.rb
+++ b/app/controllers/exercises_controller.rb
@@ -185,7 +185,7 @@ class ExercisesController < ApplicationController
 
   def user_from_api_key
     authorization_header = request.headers['Authorization']
-    api_key = authorization_header&.split(' ')&.second
+    api_key = authorization_header&.split&.second
     user_by_codeharbor_token(api_key)
   end
 
diff --git a/app/models/proxy_exercise.rb b/app/models/proxy_exercise.rb
index 8d9c6517..9ba4e7a0 100644
--- a/app/models/proxy_exercise.rb
+++ b/app/models/proxy_exercise.rb
@@ -151,7 +151,7 @@ class ProxyExercise < ApplicationRecord
     Rails.logger.debug { "select most appropiate exercise for user. his highest difficulty was #{highest_difficulty_user_has_accessed}" }
     sorted_exercises = relative_knowledge_improvement.sort_by {|_k, v| v }.reverse
 
-    sorted_exercises.each do |ex, _diff|
+    sorted_exercises.each do |ex, _diff| # rubocop:disable Style/HashEachMethods
       Rails.logger.debug { "review exercise #{ex.id} diff: #{ex.expected_difficulty}" }
       if (ex.expected_difficulty - highest_difficulty_user_has_accessed) <= 1
         Rails.logger.debug { "matched exercise #{ex.id}" }