diff --git a/Gemfile.lock b/Gemfile.lock
index 70d8e537..31fd9db9 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -290,17 +290,17 @@ GEM
       actionpack (>= 5.0)
       railties (>= 5.0)
     rexml (3.2.4)
-    rubocop (0.88.0)
+    rubocop (0.89.1)
       parallel (~> 1.10)
       parser (>= 2.7.1.1)
       rainbow (>= 2.2.2, < 4.0)
       regexp_parser (>= 1.7)
       rexml
-      rubocop-ast (>= 0.1.0, < 1.0)
+      rubocop-ast (>= 0.3.0, < 1.0)
       ruby-progressbar (~> 1.7)
       unicode-display_width (>= 1.4.0, < 2.0)
-    rubocop-ast (0.2.0)
-      parser (>= 2.7.0.1)
+    rubocop-ast (0.3.0)
+      parser (>= 2.7.1.4)
     rubocop-rails (2.7.1)
       activesupport (>= 4.2.0)
       rack (>= 1.1)
diff --git a/app/controllers/user_requests_controller.rb b/app/controllers/user_requests_controller.rb
index ee3a44ec..daf1d61d 100644
--- a/app/controllers/user_requests_controller.rb
+++ b/app/controllers/user_requests_controller.rb
@@ -48,12 +48,14 @@ def destroy
   # accept the users request.
   # Reducing the Cyclomatic Complexity on this severely reduces the readability of this function
   # rubocop:disable Metrics/CyclomaticComplexity
+  # rubocop:disable Metrics/PerceivedComplexity
   def captain_of_team_requested
     @user_request = current_user&.team&.user_requests&.find(params[:id])
     @team = @user_request&.team
     raise ActiveRecord::RecordNotFound unless @user_request&.team&.team_captain&.eql?(current_user)
   end
   # rubocop:enable Metrics/CyclomaticComplexity
+  # rubocop:enable Metrics/PerceivedComplexity
 
   # Only allow team captain and the user requesting to delete a user request.
   def check_if_able_to_reject
diff --git a/app/helpers/application_helper.rb b/app/helpers/application_helper.rb
index 498d92ee..c8080132 100644
--- a/app/helpers/application_helper.rb
+++ b/app/helpers/application_helper.rb
@@ -28,6 +28,6 @@ def active_navbar?(page)
   end
 
   def amount_of_errors(alerts)
-    pluralize(alerts.length, I18n.t('challenges.error_singular')) + ':'
+    "#{pluralize(alerts.length, I18n.t('challenges.error_singular'))}:"
   end
 end
diff --git a/app/helpers/teams_helper.rb b/app/helpers/teams_helper.rb
index 6c9bd705..ed767905 100644
--- a/app/helpers/teams_helper.rb
+++ b/app/helpers/teams_helper.rb
@@ -4,7 +4,7 @@ module TeamsHelper
   def display_name(team)
     return team.team_name if team.eligible?
 
-    "#{team.team_name} (" + I18n.t('challenges.team_ineligible_for_prizes') + ')'
+    "#{team.team_name} (#{I18n.t('challenges.team_ineligible_for_prizes')})"
   end
 
   def solved_challenge_table_point_value(solved_challenge, team)
@@ -22,6 +22,6 @@ def eligible?(user_request)
   end
 
   def header_with_points(team)
-    "#{display_name(team)} - " + pluralize(team.score, I18n.t('challenges.point_value_singular'))
+    "#{display_name(team)} - #{pluralize(team.score, I18n.t('challenges.point_value_singular'))}"
   end
 end
diff --git a/app/models/team.rb b/app/models/team.rb
index e006fb7f..e7fed599 100644
--- a/app/models/team.rb
+++ b/app/models/team.rb
@@ -89,14 +89,14 @@ def find_rank
     (1 + (division.ordered_teams.index self))
   end
 
-  # rubocop:disable Metrics/AbcSize
   # Takes a query and the column it is filtering and returns results.
   def self.search_by(query, column_to_filter)
     # condition query, parse into individual keywords
     terms = query.to_s.downcase.split(/\s+/)
     # replace "*" with "%" for wildcard searches,
     # prepend and append '%', remove duplicate '%'s
-    terms = terms.map { |e| ('%' + e.tr('*', '%') + '%').gsub(/%+/, '%') }
+    # string concatenation here works much better than interpolation
+    terms = terms.map { |e| ('%' + e.tr('*', '%') + '%').gsub(/%+/, '%') } # rubocop:disable Style/StringConcatenation
     # configure number of OR conditions for provision
     # of interpolation arguments. Adjust this if you
     # change the number of OR conditions.
@@ -109,7 +109,6 @@ def self.search_by(query, column_to_filter)
       *terms.map { |e| [e] * num_or_conditions }.flatten
     )
   end
-  # rubocop:enable Metrics/AbcSize
 
   def cleanup
     destroy if users.empty?
diff --git a/config/environments/production.rb b/config/environments/production.rb
index a3697c7f..6b519149 100644
--- a/config/environments/production.rb
+++ b/config/environments/production.rb
@@ -83,7 +83,7 @@
   # config.logger = ActiveSupport::TaggedLogging.new(Syslog::Logger.new 'app-name')
 
   if ENV['RAILS_LOG_TO_STDOUT'].present?
-    logger           = ActiveSupport::Logger.new(STDOUT)
+    logger           = ActiveSupport::Logger.new($stdout)
     logger.formatter = config.log_formatter
     config.logger    = ActiveSupport::TaggedLogging.new(logger)
   end