diff --git a/Gemfile.lock b/Gemfile.lock
index 1b18981f..b69ff9b9 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -200,7 +200,7 @@ GEM
       activesupport (>= 5.0.0)
     js-routes (2.2.8)
       railties (>= 4)
-    json (2.6.3)
+    json (2.7.0)
     json_schemer (2.1.1)
       hana (~> 1.3)
       regexp_parser (~> 2.0)
@@ -409,7 +409,7 @@ GEM
       rspec-mocks (~> 3.12)
       rspec-support (~> 3.12)
     rspec-support (3.12.1)
-    rubocop (1.57.2)
+    rubocop (1.58.0)
       json (~> 2.3)
       language_server-protocol (>= 3.17.0)
       parallel (~> 1.10)
@@ -417,7 +417,7 @@ GEM
       rainbow (>= 2.2.2, < 4.0)
       regexp_parser (>= 1.8, < 3.0)
       rexml (>= 3.2.5, < 4.0)
-      rubocop-ast (>= 1.28.1, < 2.0)
+      rubocop-ast (>= 1.30.0, < 2.0)
       ruby-progressbar (~> 1.7)
       unicode-display_width (>= 2.4.0, < 3.0)
     rubocop-ast (1.30.0)
diff --git a/app/controllers/concerns/lti.rb b/app/controllers/concerns/lti.rb
index 47bffb6f..f9d1af77 100644
--- a/app/controllers/concerns/lti.rb
+++ b/app/controllers/concerns/lti.rb
@@ -229,7 +229,7 @@ module Lti
        hide_test_results
        disable_hints
        disable_download].each do |option|
-      value = params["custom_embed_options_#{option}".to_sym] == 'true'
+      value = params[:"custom_embed_options_#{option}"] == 'true'
       # Optimize storage and save only those that are true, the session cookie is limited to 4KB
       @embed_options[option] = value if value.present?
     end
diff --git a/app/controllers/tips_controller.rb b/app/controllers/tips_controller.rb
index aae4f2bd..ad39a5ac 100644
--- a/app/controllers/tips_controller.rb
+++ b/app/controllers/tips_controller.rb
@@ -28,7 +28,7 @@ class TipsController < ApplicationController
 
     params[:tip]
       .permit(:title, :description, :example, :file_type_id)
-      .each {|_key, value| value.strip! unless value.is_a?(Array) }
+      .each_value {|value| value.strip! unless value.is_a?(Array) }
       .merge(user: current_user)
   end
   private :tip_params
diff --git a/app/models/application_record.rb b/app/models/application_record.rb
index ae82f5a8..2870c0e8 100644
--- a/app/models/application_record.rb
+++ b/app/models/application_record.rb
@@ -12,7 +12,7 @@ class ApplicationRecord < ActiveRecord::Base
     # and except the `log` of TestrunMessages or the `output` of Testruns
     attribute_names.without('content', 'log', 'output').each do |name|
       if send(name.to_sym).respond_to?(:strip)
-        send("#{name}=".to_sym, send(name).strip)
+        send(:"#{name}=", send(name).strip)
       end
     end
   end
@@ -21,7 +21,7 @@ class ApplicationRecord < ActiveRecord::Base
     # remove null bytes from string attributes
     attribute_names.each do |name|
       if send(name.to_sym).respond_to?(:tr)
-        send("#{name}=".to_sym, send(name).tr("\0", ''))
+        send(:"#{name}=", send(name).tr("\0", ''))
       end
     end
   end
diff --git a/app/models/submission.rb b/app/models/submission.rb
index a2288e0b..75565104 100644
--- a/app/models/submission.rb
+++ b/app/models/submission.rb
@@ -213,7 +213,7 @@ class Submission < ApplicationRecord
   private
 
   def build_files_hash(files, attribute)
-    files&.map(&attribute.to_proc)&.zip(files)&.to_h || {}
+    files&.map(&attribute.to_proc)&.zip(files).to_h
   end
 
   def prepared_runner
@@ -269,7 +269,7 @@ class Submission < ApplicationRecord
   def score_file(output, file, requesting_user)
     assessor = Assessor.new(execution_environment:)
     assessment = assessor.assess(output)
-    passed = ((assessment[:passed] == assessment[:count]) and (assessment[:score]).positive?)
+    passed = (assessment[:passed] == assessment[:count]) and (assessment[:score]).positive?
     testrun_output = passed ? nil : "status: #{output[:status]}\n stdout: #{output[:stdout]}\n stderr: #{output[:stderr]}"
     if testrun_output.present?
       execution_environment.error_templates.each do |template|
diff --git a/spec/lib/runner/strategy/poseidon/connection_spec.rb b/spec/lib/runner/strategy/poseidon/connection_spec.rb
index 17fb8aab..7b5ca562 100644
--- a/spec/lib/runner/strategy/poseidon/connection_spec.rb
+++ b/spec/lib/runner/strategy/poseidon/connection_spec.rb
@@ -25,7 +25,7 @@ RSpec.describe Runner::Strategy::Poseidon::Connection do
 
     shared_examples 'calls a message handler' do
       it 'calls the corresponding handler' do
-        handler = "handle_#{message[:type]}".to_sym
+        handler = :"handle_#{message[:type]}"
         expect(connection).to receive(handler)
         process_message
       end