diff --git a/.rubocop.yml b/.rubocop.yml
index 59f68245..3f9fdc3f 100644
--- a/.rubocop.yml
+++ b/.rubocop.yml
@@ -1,63 +1,232 @@
-inherit_mode:
-  merge:
-    - Exclude
 require:
   - rubocop-rails
+
 AllCops:
   Exclude:
-    - bin/puma
-    - bin/pumactl
-    - bin/setup
-    - bin/rainbows
-    - bin/unicorn
-    - bin/unicorn_rails
-    - bin/update
-    - bin/yarn
-    - vendor/bundle/**/*
-  TargetRubyVersion: 2.6
+  - 'bin/**/*'
+  - 'db/schema.rb'
+  - 'vendor/**/*'
+  - 'vendor/bundle/**/*'
+  DisabledByDefault: false
+  TargetRubyVersion: 2.7
+
+  NewCops: enable
+
+Rails/DynamicFindBy:
+  Enabled: true
+
+Rails/CreateTableWithTimestamps:
+  Enabled: false
+
+Style/BlockDelimiters:
+  Enabled: false
+
+# Checks if uses of quotes match the configured preference.
+Style/StringLiterals:
+  Enabled: false
+
+# Document classes and non-namespace modules.
+Style/Documentation:
+  Enabled: false
+
+# Check for conditionals that can be replaced with guard clauses
+Style/GuardClause:
+  Enabled: false
+
+# Checks the formatting of empty method definitions.
+Style/EmptyMethod:
+  Enabled: false
+
+# Checks for trailing comma in hash literals.
+Style/TrailingCommaInHashLiteral:
+  Enabled: false
+
+# Checks for trailing comma in argument lists.
+Style/TrailingCommaInArguments:
+  Enabled: false
+
+# Checks that `include`, `extend` and `prepend` exists at the top level.
+Style/MixinUsage:
+  Enabled: false
+
+# Use %i or %I for arrays of symbols.
+Style/SymbolArray:
+  Enabled: false
+
+# Don't use begin blocks when they are not needed.
+Style/RedundantBegin:
+  Enabled: false
+
+# Use `%`-literal delimiters consistently
+Style/PercentLiteralDelimiters:
+  Enabled: false
+
+# Only use if/unless modifiers on single line statements.
+Style/MultilineIfModifier:
+  Enabled: false
+
+# Checks for trailing comma in array literals.
+Style/TrailingCommaInArrayLiteral:
+  Enabled: false
+
+# Use `expand_path(__dir__)` instead of `expand_path('..', __FILE__)`.
+Style/ExpandPathArguments:
+  Enabled: false
+
+# Do not assign mutable objects to constants.
+Style/MutableConstant:
+  Enabled: false
+
+# Avoid rescuing without specifying an error class.
+Style/RescueStandardError:
+  Enabled: false
+
+# Align the elements of a hash literal if they span more than one line.
 Layout/HashAlignment:
-  EnforcedHashRocketStyle: [ key, table ]
-  EnforcedColonStyle: [ key, table ]
+  Enabled: false
+
+# Align the parameters of a method definition if they span more than one line.
+Layout/ParameterAlignment:
+  Enabled: false
+
+# Align ends corresponding to defs correctly.
+Layout/EndAlignment:
+  Enabled: false
+
+# Align elses and elsifs correctly.
+Layout/ElseAlignment:
+  Enabled: false
+
+# Add empty line after guard clause.
+Layout/EmptyLineAfterGuardClause:
+  Enabled: false
+
+# Align the arguments of a method call if they span more than one line.
+Layout/ArgumentAlignment:
+  Enabled: false
+
+Layout/CaseIndentation:
+  Enabled: false
+
+Layout/EmptyLinesAroundAttributeAccessor:
+  Enabled: true
+
+Layout/IndentationWidth:
+  Enabled: false
+
+Layout/SpaceAroundMethodCallOperator:
+  Enabled: true
+
+
+# Avoid long blocks with many lines.
+Metrics/BlockLength:
+  Enabled: false
+
+# A complexity metric geared towards measuring complexity for a human reader.
+Metrics/PerceivedComplexity:
+  Max: 17
+  Exclude:
+    - app/models/recording.rb
+    - app/models/server.rb
+    - lib/server_sync.rb
+
+# Avoid classes longer than 100 lines of code.
+Metrics/ClassLength:
+  Enabled: false
+
+# Limit lines to 80 characters.
 Layout/LineLength:
-  Max: 128
-Layout/MultilineMethodCallIndentation:
-  EnforcedStyle: indented
-Metrics:
+  Max: 130
+
+# Avoid methods longer than 10 lines of code.
+Metrics/MethodLength:
   Enabled: false
+
+Metrics/ModuleLength:
+  Enabled: false
+
+# A calculated magnitude based on number of assignments,
+# branches, and conditions.
+Metrics/AbcSize:
+  Max: 60
+  Exclude:
+    - app/controllers/bigbluebutton_api_controller.rb
+    - app/models/recording.rb
+    - app/models/server.rb
+    - lib/recording_importer.rb
+    - lib/server_sync.rb
+
+# A complexity metric that is strongly correlated to the number
+# of test cases needed to validate a method.
+Metrics/CyclomaticComplexity:
+  Max: 20
+  Exclude:
+    - app/models/recording.rb
+    - app/models/server.rb
+    - lib/server_sync.rb
+
+# Checks for method parameter names that contain capital letters, end in numbers, or do not meet a minimal length.
+Naming/MethodParameterName:
+  Enabled: false
+
 Naming/AccessorMethodName:
   Exclude:
     - app/controllers/bigbluebutton_api_controller.rb
+
 Naming/PredicateName:
   Exclude:
     - app/controllers/bigbluebutton_api_controller.rb
-Rails:
+
+# Checks for ambiguous block association with method when param passed without parentheses.
+Lint/AmbiguousBlockAssociation:
+  Enabled: false
+
+Lint/ConstantDefinitionInBlock:
+  Enabled: false
+
+Lint/DeprecatedOpenSSLConstant:
   Enabled: true
-Rails/DynamicFindBy:
-  # The models used in this code aren't actually ActiveRecord
+
+Lint/DuplicateBranch:
   Enabled: false
-Style/AsciiComments:
-  AllowedChars: [ © ]
-Style/Documentation:
+
+Lint/EmptyBlock:
   Enabled: false
-Style/DoubleNegation:
+
+Lint/LiteralInInterpolation:
   Enabled: false
-Style/MethodCallWithArgsParentheses:
-  Enabled: true
-  IgnoredMethods:
-    - desc
-    - gem
-    - include
-    - require
-    - require_relative
-    - ruby
-    - raise
-    - source
-    - throw
+
+Lint/RaiseException:
+  Enabled: true
+
+Lint/StructNewOverride:
+  Enabled: true
+
+Style/CombinableLoops:
   Exclude:
-    - "**/*.xml.builder"
-Style/SymbolArray:
-  MinSize: 6
-Style/TrailingCommaInArrayLiteral:
-  EnforcedStyleForMultiline: consistent_comma
-Style/TrailingCommaInHashLiteral:
-  EnforcedStyleForMultiline: consistent_comma
+    - lib/server_sync.rb
+    - test/models/server_test.rb
+
+Style/DoubleNegation:
+  Enabled: false
+
+Style/ExponentialNotation:
+  Enabled: true
+
+Style/HashEachMethods:
+  Enabled: true
+
+Style/HashLikeCase:
+  Enabled: false
+
+Style/HashTransformKeys:
+  Enabled: true
+
+Style/HashTransformValues:
+  Enabled: true
+
+Style/OptionalBooleanParameter:
+  Enabled: false
+
+Style/SlicingWithRange:
+  Enabled: true
diff --git a/Gemfile b/Gemfile
index 48f989d4..1d2493de 100644
--- a/Gemfile
+++ b/Gemfile
@@ -45,11 +45,12 @@ group :development, :test do
 
   gem 'dotenv-rails'
   gem 'factory_bot_rails'
+
+  gem 'rubocop', '~> 1.10.0', require: false
+  gem 'rubocop-rails', '~> 2.4.0', require: false
 end
 
 group :development do
-  gem 'rubocop', '~> 0.79.0', require: false
-  gem 'rubocop-rails', '~> 2.4.0', require: false
   # Spring speeds up development by keeping your application running in the background. Read more: https://github.com/rails/spring
   gem 'spring'
   gem 'spring-watcher-listen', '~> 2.0.0'
diff --git a/Gemfile.lock b/Gemfile.lock
index 8b80f965..5abaab6d 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -67,7 +67,7 @@ GEM
     addressable (2.8.0)
       public_suffix (>= 2.0.2, < 5.0)
     ast (2.4.2)
-    bootsnap (1.7.5)
+    bootsnap (1.9.1)
       msgpack (~> 1.0)
     builder (3.2.4)
     byebug (11.1.3)
@@ -86,13 +86,12 @@ GEM
     factory_bot_rails (6.2.0)
       factory_bot (~> 6.2.0)
       railties (>= 5.0.0)
-    ffi (1.15.0)
+    ffi (1.15.4)
     globalid (0.5.2)
       activesupport (>= 5.0)
     hashdiff (1.0.1)
     i18n (1.8.10)
       concurrent-ruby (~> 1.0)
-    jaro_winkler (1.5.4)
     jwt (2.2.3)
     listen (3.1.5)
       rb-fsevent (~> 0.9, >= 0.9.4)
@@ -103,9 +102,9 @@ GEM
       nokogiri (>= 1.5.9)
     mail (2.7.1)
       mini_mime (>= 0.1.1)
-    marcel (1.0.1)
+    marcel (1.0.2)
     method_source (1.0.0)
-    mini_mime (1.1.1)
+    mini_mime (1.1.2)
     mini_portile2 (2.6.1)
     minitest (5.14.4)
     minitest-stub_any_instance (1.0.2)
@@ -114,14 +113,14 @@ GEM
     nokogiri (1.12.5)
       mini_portile2 (~> 2.6.1)
       racc (~> 1.4)
-    parallel (1.20.1)
-    parser (3.0.1.1)
+    parallel (1.21.0)
+    parser (3.0.2.0)
       ast (~> 2.4.1)
     pg (1.2.3)
     public_suffix (4.0.6)
-    puma (5.5.1)
+    puma (5.5.2)
       nio4r (~> 2.0)
-    racc (1.5.2)
+    racc (1.6.0)
     rack (2.2.3)
     rack-test (1.1.0)
       rack (>= 1.0, < 3)
@@ -156,17 +155,22 @@ GEM
     rb-fsevent (0.11.0)
     rb-inotify (0.10.1)
       ffi (~> 1.0)
-    redis (4.2.5)
+    redis (4.5.1)
     redis-namespace (1.8.1)
       redis (>= 3.0.4)
+    regexp_parser (2.1.1)
     rexml (3.2.5)
-    rubocop (0.79.0)
-      jaro_winkler (~> 1.5.1)
+    rubocop (1.10.0)
       parallel (~> 1.10)
-      parser (>= 2.7.0.1)
+      parser (>= 3.0.0.0)
       rainbow (>= 2.2.2, < 4.0)
+      regexp_parser (>= 1.8, < 3.0)
+      rexml
+      rubocop-ast (>= 1.2.0, < 2.0)
       ruby-progressbar (~> 1.7)
-      unicode-display_width (>= 1.4.0, < 1.7)
+      unicode-display_width (>= 1.4.0, < 3.0)
+    rubocop-ast (1.12.0)
+      parser (>= 3.0.1.1)
     rubocop-rails (2.4.2)
       rack (>= 1.1)
       rubocop (>= 0.72.0)
@@ -193,14 +197,14 @@ GEM
     tzinfo (1.2.9)
       thread_safe (~> 0.1)
     unicode-display_width (1.6.1)
-    webmock (3.13.0)
-      addressable (>= 2.3.6)
+    webmock (3.14.0)
+      addressable (>= 2.8.0)
       crack (>= 0.3.2)
       hashdiff (>= 0.4.0, < 2.0.0)
     websocket-driver (0.7.5)
       websocket-extensions (>= 0.1.0)
     websocket-extensions (0.1.5)
-    zeitwerk (2.4.2)
+    zeitwerk (2.5.0)
 
 PLATFORMS
   ruby
@@ -220,7 +224,7 @@ DEPENDENCIES
   rails (~> 6.0.4, >= 6.0.4.1)
   redis (~> 4.2)
   redis-namespace (~> 1.8)
-  rubocop (~> 0.79.0)
+  rubocop (~> 1.10.0)
   rubocop-rails (~> 2.4.0)
   spring
   spring-watcher-listen (~> 2.0.0)
diff --git a/app/controllers/bigbluebutton_api_controller.rb b/app/controllers/bigbluebutton_api_controller.rb
index 7f15a2c6..39e722f0 100644
--- a/app/controllers/bigbluebutton_api_controller.rb
+++ b/app/controllers/bigbluebutton_api_controller.rb
@@ -268,11 +268,10 @@ def join
   end
 
   def get_recordings
-    if Rails.configuration.x.get_recordings_api_filtered
-      if params[:recordID].blank? && params[:meetingID].blank?
-        raise BBBError.new('missingParameters', 'param meetingID or recordID must be included.')
-      end
+    if Rails.configuration.x.get_recordings_api_filtered && (params[:recordID].blank? && params[:meetingID].blank?)
+      raise BBBError.new('missingParameters', 'param meetingID or recordID must be included.')
     end
+
     query = Recording.includes(playback_formats: [:thumbnails], metadata: []).references(:metadata)
     query = if params[:state].present?
               states = params[:state].split(',')
@@ -284,7 +283,7 @@ def get_recordings
     if meta_params.present?
       meta_query = '(metadata.key = ? and metadata.value in (?))'
       meta_values = [meta_params[0][0].remove('meta_'), meta_params[0][1].split(',')]
-      meta_params[1..-1].each do |val|
+      meta_params[1..].each do |val|
         meta_query += ' or (metadata.key = ? and metadata.value in (?))'
         meta_values << val[0].remove('meta_')
         meta_values << val[1].split(',')
@@ -361,7 +360,7 @@ def update_recordings
     params.each do |key, value|
       next unless key.start_with?('meta_')
 
-      key = key[5..-1].downcase
+      key = key[5..].downcase
 
       if value.blank?
         remove_metadata << key
@@ -425,7 +424,7 @@ def analytics_callback
 
     meeting_id = params['meeting_id']
     logger.info("Making analytics callback for #{meeting_id}")
-    callback_data = CallbackData.find_by_meeting_id(meeting_id)
+    callback_data = CallbackData.find_by(meeting_id: meeting_id)
     analytics_callback_url = callback_data&.callback_attributes&.dig(:analytics_callback_url)
     return if analytics_callback_url.nil?
 
@@ -449,7 +448,7 @@ def analytics_callback
   # Has to be to_unsafe_hash since to_h only accepts permitted attributes
   def pass_through_params(excluded_params)
     params.except(*(excluded_params + [:format, :controller, :action, :checksum]))
-      .to_unsafe_hash
+          .to_unsafe_hash
   end
 
   # Success response if there are no meetings on any servers
diff --git a/app/controllers/concerns/bbb_errors.rb b/app/controllers/concerns/bbb_errors.rb
index 3be15b78..6a7676cc 100644
--- a/app/controllers/concerns/bbb_errors.rb
+++ b/app/controllers/concerns/bbb_errors.rb
@@ -2,11 +2,10 @@
 
 module BBBErrors
   class BBBError < StandardError
-    attr_accessor :return_code
-    attr_accessor :message_key
-    attr_accessor :message
+    attr_accessor :return_code, :message_key, :message
 
     def initialize(message_key = '', message = '')
+      super()
       @return_code = 'FAILED'
       @message_key = message_key if message_key.present?
       @message = message if message.present?
diff --git a/app/controllers/health_check_controller.rb b/app/controllers/health_check_controller.rb
index 70f5c3b0..e800fb18 100644
--- a/app/controllers/health_check_controller.rb
+++ b/app/controllers/health_check_controller.rb
@@ -24,9 +24,7 @@ def cache_check
   end
 
   def database_check
-    if defined?(ActiveRecord)
-      raise 'Database not responding' unless ActiveRecord::Migrator.current_version
-    end
+    raise 'Database not responding' if defined?(ActiveRecord) && !ActiveRecord::Migrator.current_version
     raise 'Pending migrations' unless ActiveRecord::Migration.check_pending!.nil?
   end
 end
diff --git a/app/controllers/playback_controller.rb b/app/controllers/playback_controller.rb
index 498ed60e..5bc72b92 100644
--- a/app/controllers/playback_controller.rb
+++ b/app/controllers/playback_controller.rb
@@ -15,16 +15,14 @@ class RecordingNotFoundError < StandardError
 
   def play
     @playback_format = PlaybackFormat
-      .joins(:recording)
-      .find_by!(format: params[:playback_format], recordings: { record_id: params[:record_id] })
+                       .joins(:recording)
+                       .find_by!(format: params[:playback_format], recordings: { record_id: params[:record_id] })
     @recording = @playback_format.recording
 
     if @recording.protected
       # Consume the one-time-use token (return an error if missing/invalid)
       payload = PlaybackFormat.consume_protector_token(params[:token])
-      if payload['record_id'] != @recording.record_id || payload['format'] != @playback_format.format
-        raise RecordingNotFoundError
-      end
+      raise RecordingNotFoundError if payload['record_id'] != @recording.record_id || payload['format'] != @playback_format.format
 
       # Set the cookie that will provide access to resources for this recording & playback format
       create_cookie
@@ -35,8 +33,8 @@ def play
 
   def resource
     @playback_format = PlaybackFormat
-      .joins(:recording)
-      .find_by!(format: params[:playback_format], recordings: { record_id: params[:record_id] })
+                       .joins(:recording)
+                       .find_by!(format: params[:playback_format], recordings: { record_id: params[:record_id] })
     @recording = @playback_format.recording
 
     verify_cookie if @recording.protected
diff --git a/app/handlers/recording_ready_event_handler.rb b/app/handlers/recording_ready_event_handler.rb
index 8899297b..acb973d3 100644
--- a/app/handlers/recording_ready_event_handler.rb
+++ b/app/handlers/recording_ready_event_handler.rb
@@ -3,10 +3,6 @@
 class RecordingReadyEventHandler < EventHandler
   attr_accessor :callback_url
 
-  def initialize(params, *args)
-    super
-  end
-
   def handle
     set_callback_url
     return if callback_url.nil?
diff --git a/app/models/application_redis_record.rb b/app/models/application_redis_record.rb
index 6cf6671a..9b632947 100644
--- a/app/models/application_redis_record.rb
+++ b/app/models/application_redis_record.rb
@@ -122,15 +122,22 @@ def init_with_attributes(attributes, new_record = false)
 
   def self.application_redis_attr(*syms)
     attr_reader(*syms)
+
     syms.each do |sym|
       raise NameError, "invalid attribute name: #{sym}" unless /^[_A-Za-z]\w*$/.match?(sym)
 
-      class_eval(<<-END_OF_RUBY, __FILE__, __LINE__ + 1)
-        def #{sym}=(value)
-          #{sym}_will_change! unless @#{sym} == value
-          @#{sym} = value
-        end
-      END_OF_RUBY
+      class_eval(
+        # def #{sym}=(value)
+        #   #{sym}_will_change! unless @#{sym} == value
+        #   @#{sym} = value
+        # end
+        <<-END_OF_RUBY, __FILE__, __LINE__ + 1
+          def #{sym}=(value)
+            #{sym}_will_change! unless @#{sym} == value
+            @#{sym} = value
+          end
+        END_OF_RUBY
+      )
     end
   end
 
@@ -139,10 +146,8 @@ def self.connection_pool
   end
   delegate :connection_pool, to: 'self.class'
 
-  def self.with_connection
-    RedisStore.with_connection do |redis|
-      yield(redis)
-    end
+  def self.with_connection(&block)
+    RedisStore.with_connection(&block)
   end
   delegate :with_connection, to: 'self.class'
 
diff --git a/app/models/recording.rb b/app/models/recording.rb
index 079daf2c..a3e3c50d 100644
--- a/app/models/recording.rb
+++ b/app/models/recording.rb
@@ -16,7 +16,7 @@ class Recording < ApplicationRecord
   def self.with_recording_id_prefixes(recording_ids)
     return none if recording_ids.empty?
 
-    rid_prefixes = recording_ids.map { |rid| sanitize_sql_like(rid, '|') + '%' }
+    rid_prefixes = recording_ids.map { |rid| "#{sanitize_sql_like(rid, '|')}%" }
     query_string = Array.new(recording_ids.length, "record_id LIKE ? ESCAPE '|'").join(' OR ')
 
     where(query_string, *rid_prefixes)
diff --git a/config/application.rb b/config/application.rb
index 7073c993..e27ace5e 100644
--- a/config/application.rb
+++ b/config/application.rb
@@ -65,20 +65,20 @@ class Application < Rails::Application
 
     # Directory to monitor for recordings transferred from BigBlueButton servers
     config.x.recording_spool_dir = File.absolute_path(
-      ENV.fetch('RECORDING_SPOOL_DIR') { '/var/bigbluebutton/spool' }
+      ENV.fetch('RECORDING_SPOOL_DIR', '/var/bigbluebutton/spool')
     )
     # Working directory for temporary files when extracting recordings
     config.x.recording_work_dir = File.absolute_path(
-      ENV.fetch('RECORDING_WORK_DIR') { '/var/bigbluebutton/recording/scalelite' }
+      ENV.fetch('RECORDING_WORK_DIR', '/var/bigbluebutton/recording/scalelite')
     )
     # Published recording directory
     config.x.recording_publish_dir = File.absolute_path(
-      ENV.fetch('RECORDING_PUBLISH_DIR') { '/var/bigbluebutton/published' }
+      ENV.fetch('RECORDING_PUBLISH_DIR', '/var/bigbluebutton/published')
     )
 
     # Unpublished recording directory
     config.x.recording_unpublish_dir = File.absolute_path(
-      ENV.fetch('RECORDING_UNPUBLISH_DIR') { '/var/bigbluebutton/unpublished' }
+      ENV.fetch('RECORDING_UNPUBLISH_DIR', '/var/bigbluebutton/unpublished')
     )
 
     # Minimum user count of a meeting, used for calculating server load. Defaults to 15.
diff --git a/config/environments/development.rb b/config/environments/development.rb
index e5caef9b..f2bfe27e 100644
--- a/config/environments/development.rb
+++ b/config/environments/development.rb
@@ -38,7 +38,7 @@
     config.active_record.verbose_query_logs = true
   end
 
-  Rails.logger = Logger.new(STDOUT)
+  Rails.logger = Logger.new($stdout)
 
   # Raises error for missing translations.
   # config.action_view.raise_on_missing_translations = true
diff --git a/config/environments/production.rb b/config/environments/production.rb
index ee160eda..076b57a7 100644
--- a/config/environments/production.rb
+++ b/config/environments/production.rb
@@ -67,8 +67,8 @@
 
   if 'true'.casecmp?(ENV['RAILS_LOG_TO_STDOUT'])
     # Disable output buffering when STDOUT isn't a tty (e.g. Docker images, systemd services)
-    STDOUT.sync = true
-    logger = ActiveSupport::Logger.new(STDOUT)
+    $stdout.sync = true
+    logger = ActiveSupport::Logger.new($stdout)
     logger.formatter = config.log_formatter
     config.logger = ActiveSupport::TaggedLogging.new(logger)
   end
diff --git a/config/environments/test.rb b/config/environments/test.rb
index d9846a00..50ab61d5 100644
--- a/config/environments/test.rb
+++ b/config/environments/test.rb
@@ -39,5 +39,5 @@
   # config.action_view.raise_on_missing_translations = true
 
   # Ensure a dummy secret is set for testing
-  config.x.loadbalancer_secrets = [ENV.fetch('LOADBALANCER_SECRET') { 'f830c18ee29c8531e0115c3da85db89b' }]
+  config.x.loadbalancer_secrets = [ENV.fetch('LOADBALANCER_SECRET', 'f830c18ee29c8531e0115c3da85db89b')]
 end
diff --git a/config/puma.rb b/config/puma.rb
index 376e1c72..339fc130 100644
--- a/config/puma.rb
+++ b/config/puma.rb
@@ -5,23 +5,23 @@
 # the concurrency of the application would be max `threads` * `workers`.
 # Workers do not work on JRuby or Windows (both of which do not support
 # processes).
-workers(ENV.fetch('WEB_CONCURRENCY') { 0 })
+workers(ENV.fetch('WEB_CONCURRENCY', 0))
 
 # Puma can serve each request in a thread from an internal thread pool.
 # The `threads` method setting takes two numbers: a minimum and maximum.
 # Any libraries that use thread pools should be configured to match
 # the maximum value specified for Puma. Default is set to 5 threads for minimum
 # and maximum; this matches the default thread size of Active Record.
-max_threads_count = ENV.fetch('RAILS_MAX_THREADS') { 5 }
+max_threads_count = ENV.fetch('RAILS_MAX_THREADS', 5)
 min_threads_count = ENV.fetch('RAILS_MIN_THREADS') { max_threads_count }
 threads(min_threads_count, max_threads_count)
 
 # Specifies the `port` that Puma will listen on to receive requests; default is 3000.
 # You can either specify `BIND` with a full address (even unix socket) or just `PORT`
-bind(ENV.fetch('BIND') { "tcp://0.0.0.0:#{ENV.fetch('PORT') { 3000 }}" })
+bind(ENV.fetch('BIND') { "tcp://0.0.0.0:#{ENV.fetch('PORT', 3000)}" })
 
 # Specifies the `environment` that Puma will run in.
-environment(ENV.fetch('RAILS_ENV') { 'development' })
+environment(ENV.fetch('RAILS_ENV', 'development'))
 
 # Use the `preload_app!` method when specifying a `workers` number.
 # This directive tells Puma to first boot the application and load code
diff --git a/db/migrate/20181123180008_init.rb b/db/migrate/20181123180008_init.rb
index 0cbd25e9..1e552898 100644
--- a/db/migrate/20181123180008_init.rb
+++ b/db/migrate/20181123180008_init.rb
@@ -1,17 +1,15 @@
 # frozen_string_literal: true
 
-# rubocop:disable Rails/CreateTableWithTimestamps
-
 class Init < ActiveRecord::Migration[6.0]
   def change
-    create_table :metadata, force: :cascade do |t|
+    create_table(:metadata, force: :cascade) do |t|
       t.bigint(:recording_id)
       t.string(:key)
       t.string(:value)
       t.index(%w[recording_id key], name: 'index_metadata_on_recording_id_and_key', unique: true)
     end
 
-    create_table :playback_formats, force: :cascade do |t|
+    create_table(:playback_formats, force: :cascade) do |t|
       t.bigint(:recording_id)
       t.string(:format)
       t.string(:url)
@@ -20,7 +18,7 @@ def change
       t.index(%w[recording_id format], name: 'index_playback_formats_on_recording_id_and_format', unique: true)
     end
 
-    create_table :recordings, force: :cascade do |t|
+    create_table(:recordings, force: :cascade) do |t|
       t.string(:record_id)
       t.string(:meeting_id)
       t.string(:name)
@@ -34,7 +32,7 @@ def change
       t.index(%w[record_id], name: 'index_recordings_on_record_id', unique: true)
     end
 
-    create_table :thumbnails, force: :cascade do |t|
+    create_table(:thumbnails, force: :cascade) do |t|
       t.bigint(:playback_format_id)
       t.integer(:width)
       t.integer(:height)
@@ -45,5 +43,3 @@ def change
     end
   end
 end
-
-# rubocop:enable Rails/CreateTableWithTimestamps
diff --git a/db/migrate/20210425184558_create_callback_data.rb b/db/migrate/20210425184558_create_callback_data.rb
index 5d9d7c99..4f21926b 100644
--- a/db/migrate/20210425184558_create_callback_data.rb
+++ b/db/migrate/20210425184558_create_callback_data.rb
@@ -2,7 +2,7 @@
 
 class CreateCallbackData < ActiveRecord::Migration[6.0]
   def change
-    create_table :callback_data do |t|
+    create_table(:callback_data) do |t|
       t.string(:meeting_id)
       t.integer(:recording_id)
       t.text(:callback_attributes)
diff --git a/lib/redis_store.rb b/lib/redis_store.rb
index ab852557..54340f05 100644
--- a/lib/redis_store.rb
+++ b/lib/redis_store.rb
@@ -31,7 +31,7 @@ def self.before_fork
     end
   end
 
-  def self.with_connection
-    connection_pool.with { |connection| yield(connection) }
+  def self.with_connection(&block)
+    connection_pool.with(&block)
   end
 end
diff --git a/lib/server_sync.rb b/lib/server_sync.rb
index 8f552251..8400f174 100644
--- a/lib/server_sync.rb
+++ b/lib/server_sync.rb
@@ -19,7 +19,7 @@ def self.logger
   # contain a +servers+ hash mapping IDs to server parameters. For details,
   # see +ServerSync.sync+
   def self.sync_file(path, mode = 'cordon', dryrun = false)
-    yaml = YAML.safe_load(path == '-' ? STDIN.read : File.read(path))
+    yaml = YAML.safe_load(path == '-' ? $stdin.read : File.read(path))
     raise(SyncError, 'Invalid YAML document') unless yaml.is_a?(Hash)
 
     servers = yaml['servers']
diff --git a/lib/tasks/meetings.rake b/lib/tasks/meetings.rake
index f2564a0e..155c09a4 100644
--- a/lib/tasks/meetings.rake
+++ b/lib/tasks/meetings.rake
@@ -43,7 +43,7 @@ namespace :meetings do
     $stdout.sync = true
     puts('WARNING: You are trying to clear active meetings.')
     puts('If you still wish to continue please enter `yes`')
-    response = STDIN.gets.chomp.casecmp('yes').zero?
+    response = $stdin.gets.chomp.casecmp('yes').zero?
     if response
       args.with_defaults(meeting_ids: '')
       include ApiHelper
diff --git a/lib/tasks/servers.rake b/lib/tasks/servers.rake
index 7af79323..ca7d593e 100644
--- a/lib/tasks/servers.rake
+++ b/lib/tasks/servers.rake
@@ -97,7 +97,7 @@ namespace :servers do
       puts("WARNING: You are trying to disable a server with active load. You should use the cordon option if
           you do not want to clear all the meetings")
       puts('If you still wish to continue please enter `yes`')
-      response = STDIN.gets.chomp.casecmp('yes').zero?
+      response = $stdin.gets.chomp.casecmp('yes').zero?
       if response
         meetings = Meeting.all.select { |m| m.server_id == server.id }
         meetings.each do |meeting|
@@ -167,8 +167,8 @@ namespace :servers do
     servers = YAML.load_file(args.path)['servers']
     servers.each do |server|
       created = Server.create!(url: server['url'], secret: server['secret'])
-      puts "server: #{created.url}"
-      puts "id: #{created.id}"
+      puts("server: #{created.url}")
+      puts("id: #{created.id}")
     end
   rescue StandardError => e
     puts(e)
diff --git a/test/controllers/bigbluebutton_api_controller_test.rb b/test/controllers/bigbluebutton_api_controller_test.rb
index e2142cb7..2595ae40 100644
--- a/test/controllers/bigbluebutton_api_controller_test.rb
+++ b/test/controllers/bigbluebutton_api_controller_test.rb
@@ -698,7 +698,7 @@ class BigBlueButtonApiControllerTest < ActionDispatch::IntegrationTest
       '<attendeePW>ap</attendeePW><moderatorPW>mp</moderatorPW><messageKey/><message/></response>')
 
     mocked_method = MiniTest::Mock.new
-    return_value = { 'meetingID': 'test-meeting-1', test4: '', test2: '' }
+    return_value = { meetingID: 'test-meeting-1', test4: '', test2: '' }
 
     Rails.configuration.x.stub(:create_exclude_params, []) do
       mocked_method.expect(:pass_through_params, return_value, [Rails.configuration.x.create_exclude_params])
@@ -1679,7 +1679,7 @@ class BigBlueButtonApiControllerTest < ActionDispatch::IntegrationTest
     r1 = create(:recording)
     r2 = create(:recording)
 
-    params = encode_bbb_params('deleteRecordings', { recordID: [r.record_id, r1.record_id, r2.record_id].join(',') } .to_query)
+    params = encode_bbb_params('deleteRecordings', { recordID: [r.record_id, r1.record_id, r2.record_id].join(',') }.to_query)
     get bigbluebutton_api_delete_recordings_url, params: params
     assert_response :success
 
diff --git a/test/fixtures/files/servers.yml b/test/fixtures/files/servers.yml
index 4075f7d5..a6e2e0ff 100644
--- a/test/fixtures/files/servers.yml
+++ b/test/fixtures/files/servers.yml
@@ -1,7 +1,7 @@
 servers:
-  - url: "bbb1.example.com"
+  - url: "https://bbb1.example.com/bigbluebutton/api/"
     secret: "1bdce5cbab581f3f20b199b970e53ae3c9d9df6392f79589bd58be020ed14535"
-  - url: "bbb2.example.com"
+  - url: "https://bbb2.example.com/bigbluebutton/api/"
     secret: "2bdce5cbab581f3f20b199b970e53ae3c9d9df6392f79589bd58be020ed14535"
-  - url: "bbb3.example.com"
+  - url: "https://bbb3.example.com/bigbluebutton/api/"
     secret: "3bdce5cbab581f3f20b199b970e53ae3c9d9df6392f79589bd58be020ed14535"
diff --git a/test/handlers/analytics_callback_event_handler_test.rb b/test/handlers/analytics_callback_event_handler_test.rb
index c1d58b22..3bfaf61f 100644
--- a/test/handlers/analytics_callback_event_handler_test.rb
+++ b/test/handlers/analytics_callback_event_handler_test.rb
@@ -6,14 +6,14 @@ class AnalyticsCallbackEventHandlerTest < ActiveSupport::TestCase
   test 'creates record in CallbackData' do
     params = { 'meta_analytics-callback-url' => 'https://test-1.example.com/' }
     EventHandler.new(params, 'test-123').handle
-    callbackdata = CallbackData.find_by_meeting_id('test-123')
+    callbackdata = CallbackData.find_by(meeting_id: 'test-123')
     assert_equal callbackdata.callback_attributes[:analytics_callback_url], 'https://test-1.example.com/'
   end
 
   test 'does not create record in CallbackData if meta_analytics-callback-url is nil' do
     params = { 'meta_analytics-callback-url' => nil }
     EventHandler.new(params, 'test-123').handle
-    callbackdata = CallbackData.find_by_meeting_id('test-123')
+    callbackdata = CallbackData.find_by(meeting_id: 'test-123')
     assert_nil callbackdata
   end
 end
diff --git a/test/handlers/recording_ready_event_handler_test.rb b/test/handlers/recording_ready_event_handler_test.rb
index cdcedb01..ad9613bd 100644
--- a/test/handlers/recording_ready_event_handler_test.rb
+++ b/test/handlers/recording_ready_event_handler_test.rb
@@ -6,14 +6,14 @@ class RecordingReadyEventHandlerTest < ActiveSupport::TestCase
   test 'creates record in CallbackData' do
     params = { 'meta_bn-recording-ready-url' => 'https://test-1.example.com/' }
     EventHandler.new(params, 'test-123').handle
-    callbackdata = CallbackData.find_by_meeting_id('test-123')
+    callbackdata = CallbackData.find_by(meeting_id: 'test-123')
     assert_equal callbackdata.callback_attributes[:recording_ready_url], 'https://test-1.example.com/'
   end
 
   test 'does not create record in CallbackData if meta_bn-recording-ready-url is nil' do
     params = { 'meta_bn-recording-ready-url' => nil }
     EventHandler.new(params, 'test-123').handle
-    callbackdata = CallbackData.find_by_meeting_id('test-123')
+    callbackdata = CallbackData.find_by(meeting_id: 'test-123')
     assert_nil callbackdata
   end
 
diff --git a/test/services/recording_ready_notifier_service_test.rb b/test/services/recording_ready_notifier_service_test.rb
index 8cce3693..d60b406f 100644
--- a/test/services/recording_ready_notifier_service_test.rb
+++ b/test/services/recording_ready_notifier_service_test.rb
@@ -11,7 +11,7 @@ class RecordingReadyNotifierServiceTest < ActiveSupport::TestCase
     stub_request(:post, url)
       .to_return(status: 200, body: '', headers: {})
 
-    return_val = JWT.stub(:encode, 'eyJhbGciOiJIUzI1NiJ9.eyJtZWV0aW5nX2lkIjoibWVldGluZzE5In0.Jlw1ND63QJ3j9TT0mgp_5fpmPA82FhMT_-mPU25PEFY') do # rubocop:disable LineLength
+    return_val = JWT.stub(:encode, 'eyJhbGciOiJIUzI1NiJ9.eyJtZWV0aW5nX2lkIjoibWVldGluZzE5In0.Jlw1ND63QJ3j9TT0mgp_5fpmPA82FhMT_-mPU25PEFY') do # rubocop:disable Layout/LineLength
       RecordingReadyNotifierService.execute(recording.id)
     end
 
@@ -26,7 +26,7 @@ class RecordingReadyNotifierServiceTest < ActiveSupport::TestCase
 
     stub_request(:post, url).to_timeout
 
-    return_val = JWT.stub(:encode, 'eyJhbGciOiJIUzI1NiJ9.eyJtZWV0aW5nX2lkIjoibWVldGluZzE5In0.Jlw1ND63QJ3j9TT0mgp_5fpmPA82FhMT_-mPU25PEFY') do # rubocop:disable LineLength
+    return_val = JWT.stub(:encode, 'eyJhbGciOiJIUzI1NiJ9.eyJtZWV0aW5nX2lkIjoibWVldGluZzE5In0.Jlw1ND63QJ3j9TT0mgp_5fpmPA82FhMT_-mPU25PEFY') do # rubocop:disable Layout/LineLength
       RecordingReadyNotifierService.execute(recording.id)
     end
 
diff --git a/test/services/server_sync_test.rb b/test/services/server_sync_test.rb
index 4b098fe3..d1eec496 100644
--- a/test/services/server_sync_test.rb
+++ b/test/services/server_sync_test.rb
@@ -1,9 +1,9 @@
 # frozen_string_literal: true
 
-class ServerSyncTest < ActiveSupport::TestCase
-  require 'rake'
-  require 'test_helper'
+require 'rake'
+require 'test_helper'
 
+class ServerSyncTest < ActiveSupport::TestCase
   test 'Sync all servers from yml file' do
     ServerSync.sync_file('./test/fixtures/files/servers-sync-a.yml')
     assert_equal 3, Server.all.size
diff --git a/test/tasks/Servers/add_all_task_test.rb b/test/tasks/Servers/add_all_task_test.rb
index 802ca79f..e9d3ec1d 100644
--- a/test/tasks/Servers/add_all_task_test.rb
+++ b/test/tasks/Servers/add_all_task_test.rb
@@ -1,13 +1,17 @@
 # frozen_string_literal: true
 
+require 'rake'
+require 'test_helper'
+
 class AddAllTaskTest < ActiveSupport::TestCase
-  require 'rake'
-  require 'test_helper'
+  Rails.application.load_tasks
 
   test 'adds all servers from yml file' do
-    server_count = Server.all.size
-    STDOUT.stub(:puts, '.') do
-      Rake::Task['servers:addAll'].invoke('./test/fixtures/files/servers.yml')
+    $stdout.stub(:puts, '.') do
+      server_count = Server.all.size
+      Rails.configuration.x.stub(:server_id_is_hostname, true) do
+        Rake::Task['servers:addAll'].invoke('./test/fixtures/files/servers.yml')
+      end
       assert_equal Server.all.size, server_count + 3
     end
   end