diff --git a/.rubocop.yml b/.rubocop.yml
index 20f2c28d6..5867dc178 100644
--- a/.rubocop.yml
+++ b/.rubocop.yml
@@ -7,15 +7,15 @@ AllCops:
 
 ##################### Style ####################################
 
-Style/AccessModifierIndentation:
+Layout/AccessModifierIndentation:
   EnforcedStyle: indent
 
-Style/AlignHash:
+Layout/AlignHash:
   EnforcedHashRocketStyle: key
   EnforcedColonStyle: key
   EnforcedLastArgumentHashStyle: ignore_implicit
 
-Style/AlignParameters:
+Layout/AlignParameters:
   EnforcedStyle: with_first_parameter
 
 Style/AndOr:
@@ -30,7 +30,7 @@ Style/BlockDelimiters:
 Style/BracesAroundHashParameters:
   EnforcedStyle: no_braces
 
-Style/CaseIndentation:
+Layout/CaseIndentation:
   EnforcedStyle: case
 
 Style/ClassAndModuleChildren:
@@ -53,36 +53,33 @@ Style/CommandLiteral:
 Style/DocumentationMethod:
   RequireForNonPublicMethods: false
 
-Style/DotPosition:
+Layout/DotPosition:
   EnforcedStyle: leading
 
 Style/EmptyElse:
   EnforcedStyle: both
 
-Style/EmptyLineBetweenDefs:
+Layout/EmptyLineBetweenDefs:
   AllowAdjacentOneLineDefs: false
 
-Style/EmptyLinesAroundBlockBody:
+Layout/EmptyLinesAroundBlockBody:
   EnforcedStyle: no_empty_lines
 
-Style/EmptyLinesAroundClassBody:
+Layout/EmptyLinesAroundClassBody:
   EnforcedStyle: no_empty_lines
 
-Style/EmptyLinesAroundModuleBody:
+Layout/EmptyLinesAroundModuleBody:
   EnforcedStyle: no_empty_lines
 
-Style/Encoding:
-  EnforcedStyle: always
-
-Style/ExtraSpacing:
+Layout/ExtraSpacing:
   AllowForAlignment: true
   ForceEqualSignAlignment: false
 
-Style/FileName:
+Naming/FileName:
   Enabled: false
   Exclude: []
 
-Style/FirstParameterIndentation:
+Layout/FirstParameterIndentation:
   EnforcedStyle: special_for_inner_method_call_in_parentheses
 
 Style/For:
@@ -105,16 +102,16 @@ Style/IfUnlessModifier:
   Enabled: true
   MaxLineLength: 80
 
-Style/IndentationConsistency:
+Layout/IndentationConsistency:
   EnforcedStyle: normal
 
-Style/IndentationWidth:
+Layout/IndentationWidth:
   Width: 2
 
-Style/IndentArray:
+Layout/IndentArray:
   EnforcedStyle: special_inside_parentheses
 
-Style/IndentHash:
+Layout/IndentHash:
   EnforcedStyle: special_inside_parentheses
 
 Style/Next:
@@ -126,16 +123,16 @@ Style/NonNilCheck:
 Style/MethodDefParentheses:
   EnforcedStyle: require_parentheses
 
-Style/MethodName:
+Naming/MethodName:
   EnforcedStyle: snake_case
 
 Style/ModuleFunction:
   EnforcedStyle: module_function
 
-Style/MultilineArrayBraceLayout:
+Layout/MultilineArrayBraceLayout:
   EnforcedStyle: symmetrical
 
-Style/MultilineAssignmentLayout:
+Layout/MultilineAssignmentLayout:
   SupportedTypes:
     - block
     - case
@@ -145,19 +142,19 @@ Style/MultilineAssignmentLayout:
     - module
   EnforcedStyle: new_line
 
-Style/MultilineHashBraceLayout:
+Layout/MultilineHashBraceLayout:
   EnforcedStyle: symmetrical
 
-Style/MultilineMethodCallBraceLayout:
+Layout/MultilineMethodCallBraceLayout:
   EnforcedStyle: symmetrical
 
-Style/MultilineMethodCallIndentation:
+Layout/MultilineMethodCallIndentation:
   EnforcedStyle: aligned
 
-Style/MultilineMethodDefinitionBraceLayout:
+Layout/MultilineMethodDefinitionBraceLayout:
   EnforcedStyle: symmetrical
 
-Style/MultilineOperationIndentation:
+Layout/MultilineOperationIndentation:
   EnforcedStyle: aligned
 
 Style/NumericLiterals:
@@ -192,7 +189,7 @@ Style/PercentLiteralDelimiters:
 Style/PercentQLiterals:
   EnforcedStyle: lower_case_q
 
-Style/PredicateName:
+Naming/PredicateName:
   Description: Check the names of predicate methods.
   StyleGuide: https://github.com/bbatsov/ruby-style-guide#bool-methods-qmark
   Enabled: true
@@ -234,7 +231,7 @@ Style/SingleLineBlockParams:
 Style/SingleLineMethods:
   Enabled: false
 
-Style/SpaceBeforeFirstArg:
+Layout/SpaceBeforeFirstArg:
   AllowForAlignment: true
 
 Style/StringLiterals:
@@ -249,28 +246,28 @@ Style/StringMethods:
   PreferredMethods:
     intern: to_sym
 
-Style/SpaceAroundBlockParameters:
+Layout/SpaceAroundBlockParameters:
   EnforcedStyleInsidePipes: no_space
 
-Style/SpaceAroundEqualsInParameterDefault:
+Layout/SpaceAroundEqualsInParameterDefault:
   EnforcedStyle: space
 
-Style/SpaceAroundOperators:
+Layout/SpaceAroundOperators:
   AllowForAlignment: true
 
-Style/SpaceBeforeBlockBraces:
+Layout/SpaceBeforeBlockBraces:
   EnforcedStyle: space
 
-Style/SpaceInsideBlockBraces:
+Layout/SpaceInsideBlockBraces:
   EnforcedStyle: space
   EnforcedStyleForEmptyBraces: no_space
   SpaceBeforeBlockParameters: true
 
-Style/SpaceInsideHashLiteralBraces:
+Layout/SpaceInsideHashLiteralBraces:
   EnforcedStyle: space
   EnforcedStyleForEmptyBraces: no_space
 
-Style/SpaceInsideStringInterpolation:
+Layout/SpaceInsideStringInterpolation:
   EnforcedStyle: no_space
 
 Style/SymbolArray:
@@ -285,7 +282,7 @@ Style/TernaryParentheses:
   EnforcedStyle: require_no_parentheses
   AllowSafeAssignment: true
 
-Style/TrailingBlankLines:
+Layout/TrailingBlankLines:
   EnforcedStyle: final_newline
 
 Style/TrailingCommaInArguments:
@@ -294,10 +291,10 @@ Style/TrailingCommaInArguments:
 Style/TrailingCommaInLiteral:
   EnforcedStyleForMultiline: no_comma
 
-Style/VariableName:
+Naming/VariableName:
   EnforcedStyle: snake_case
 
-Style/VariableNumber:
+Naming/VariableNumber:
   EnforcedStyle: normalcase
 
 Style/WordArray:
@@ -307,7 +304,7 @@ Style/WordArray:
 Style/InlineComment:
   Enabled: false
 
-Style/AccessorMethodName:
+Naming/AccessorMethodName:
   Enabled: true
 
 Style/Alias:
diff --git a/Gemfile b/Gemfile
index a90d4494e..f96752e88 100644
--- a/Gemfile
+++ b/Gemfile
@@ -101,7 +101,7 @@ group :development, :test do
   gem 'better_errors'
   gem 'binding_of_caller'
   gem 'awesome_print'
-  gem 'rubocop', require: false
+  gem 'rubocop', '= 0.51.0', require: false
   gem 'scss_lint', require: false
   gem 'starscope', require: false
   gem 'bullet'
diff --git a/Gemfile.lock b/Gemfile.lock
index 5d0559cc9..40dc2cde4 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -573,7 +573,7 @@ DEPENDENCIES
   rgl
   roo (~> 2.7.1)
   rspec-rails
-  rubocop
+  rubocop (= 0.51.0)
   ruby-graphviz (~> 1.2)
   rubyzip
   sanitize (~> 4.4)
@@ -602,4 +602,4 @@ RUBY VERSION
    ruby 2.4.1p111
 
 BUNDLED WITH
-   1.16.0
+   1.16.1
diff --git a/app/controllers/client_api/configurations_controller.rb b/app/controllers/client_api/configurations_controller.rb
index 30c623ba3..dfa062468 100644
--- a/app/controllers/client_api/configurations_controller.rb
+++ b/app/controllers/client_api/configurations_controller.rb
@@ -17,7 +17,7 @@ module ClientApi
     def list_all_addons
       Rails::Engine.subclasses
                    .select { |c| c.name.start_with?('Scinote') }
-                   .map(&:parent)
+                   .map { |c| c.parent.to_s }
     end
   end
 end
diff --git a/app/javascript/src/components/Navigation/components/AboutScinoteModal.jsx b/app/javascript/src/components/Navigation/components/AboutScinoteModal.jsx
index fe4fb8460..35fd8dc40 100644
--- a/app/javascript/src/components/Navigation/components/AboutScinoteModal.jsx
+++ b/app/javascript/src/components/Navigation/components/AboutScinoteModal.jsx
@@ -30,7 +30,11 @@ export default (props: Props): Node => {
             <strong>
               <FormattedMessage id="general.addon_versions" />
             </strong>
-            {addons.map((addon: string): Node => <p>{addon}</p>)}
+            {
+              addons.map(
+                (addon: string): Node => (<p key={addon}>{addon}</p>)
+              )
+            }
           </span>
         }
       </Modal.Body>