diff --git a/Library/.rubocop.yml b/Library/.rubocop.yml
index 051a57f933..d93d1bd8b4 100644
--- a/Library/.rubocop.yml
+++ b/Library/.rubocop.yml
@@ -123,6 +123,14 @@ Style/Documentation:
 Style/Encoding:
   Enabled: true
 
+# disabled until we get the Metrics/LineLength down to 80.
+Style/IfUnlessModifier:
+  Enabled: false
+
+# messes with existing plist/caveats style
+Style/TrailingBodyOnMethodDefinition:
+  Enabled: false
+
 # use spaces for indentation; detect tabs
 Layout/Tab:
   Enabled: true
@@ -214,7 +222,7 @@ Style/FrozenStringLiteralComment:
   Enabled: false
 
 # generally rescuing StandardError is fine
-Lint/RescueWithoutErrorClass:
+Style/RescueStandardError:
   Enabled: false
 
 # implicitly allow EOS as we use it everywhere
diff --git a/Library/Homebrew/.rubocop.yml b/Library/Homebrew/.rubocop.yml
index 3548677389..e0089e0500 100644
--- a/Library/Homebrew/.rubocop.yml
+++ b/Library/Homebrew/.rubocop.yml
@@ -5,6 +5,7 @@ AllCops:
   Include:
     - '**/.simplecov'
   Exclude:
+    - 'bin/*'
     - '**/Casks/**/*'
     - '**/vendor/**/*'
 
@@ -79,3 +80,7 @@ Style/GuardClause:
 # hash-rockets preferred for formulae, a: 1 preferred elsewhere
 Style/HashSyntax:
   EnforcedStyle: ruby19_no_mixed_keys
+
+# so many of these in formulae but none in here
+Style/TrailingBodyOnMethodDefinition:
+  Enabled: true
diff --git a/Library/Homebrew/cmd/style.rb b/Library/Homebrew/cmd/style.rb
index 27047dfd09..89484d67d9 100644
--- a/Library/Homebrew/cmd/style.rb
+++ b/Library/Homebrew/cmd/style.rb
@@ -70,7 +70,6 @@ module Homebrew
   def check_style_impl(files, output_type, options = {})
     fix = options[:fix]
 
-    Homebrew.install_gem_setup_path! "parser", HOMEBREW_RUBOCOP_PARSER_VERSION, "ruby-parse"
     Homebrew.install_gem_setup_path! "rubocop", HOMEBREW_RUBOCOP_VERSION
     require "rubocop"
     require_relative "../rubocops"
diff --git a/Library/Homebrew/constants.rb b/Library/Homebrew/constants.rb
index 41274922c7..9514320abe 100644
--- a/Library/Homebrew/constants.rb
+++ b/Library/Homebrew/constants.rb
@@ -1,6 +1,5 @@
 # frozen_string_literal: true
 
 # RuboCop version used for `brew style` and `brew cask style`
-HOMEBREW_RUBOCOP_VERSION = "0.51.0"
-HOMEBREW_RUBOCOP_PARSER_VERSION = "2.4.0.0" # for Ruby 2.3.3
-HOMEBREW_RUBOCOP_CASK_VERSION = "~> 0.15.1" # has to be updated when RuboCop version changes
+HOMEBREW_RUBOCOP_VERSION = "0.52.1"
+HOMEBREW_RUBOCOP_CASK_VERSION = "~> 0.16.0" # has to be updated when RuboCop version changes
diff --git a/Library/Homebrew/rubocops/bottle_block_cop.rb b/Library/Homebrew/rubocops/bottle_block_cop.rb
index 77759e427a..3cfde01ad6 100644
--- a/Library/Homebrew/rubocops/bottle_block_cop.rb
+++ b/Library/Homebrew/rubocops/bottle_block_cop.rb
@@ -16,8 +16,6 @@ module RuboCop
           problem "Use rebuild instead of revision in bottle block" if method_called_in_block?(bottle, :revision)
         end
 
-        private
-
         def autocorrect(node)
           lambda do |corrector|
             correction = node.source.sub("revision", "rebuild")
diff --git a/Library/Homebrew/rubocops/checksum_cop.rb b/Library/Homebrew/rubocops/checksum_cop.rb
index 23a7878094..4dd8ad91c8 100644
--- a/Library/Homebrew/rubocops/checksum_cop.rb
+++ b/Library/Homebrew/rubocops/checksum_cop.rb
@@ -50,8 +50,6 @@ module RuboCop
           end
         end
 
-        private
-
         def autocorrect(node)
           lambda do |corrector|
             correction = node.source.downcase
diff --git a/Library/Homebrew/rubocops/class_cop.rb b/Library/Homebrew/rubocops/class_cop.rb
index dad81abfc5..6f1ffc1444 100644
--- a/Library/Homebrew/rubocops/class_cop.rb
+++ b/Library/Homebrew/rubocops/class_cop.rb
@@ -16,8 +16,6 @@ module RuboCop
           problem "#{parent_class} is deprecated, use Formula instead"
         end
 
-        private
-
         def autocorrect(node)
           lambda do |corrector|
             corrector.replace(node.source_range, "Formula")
diff --git a/Library/Homebrew/rubocops/components_order_cop.rb b/Library/Homebrew/rubocops/components_order_cop.rb
index 3bf2ede160..a1a576177b 100644
--- a/Library/Homebrew/rubocops/components_order_cop.rb
+++ b/Library/Homebrew/rubocops/components_order_cop.rb
@@ -62,8 +62,6 @@ module RuboCop
           end
         end
 
-        private
-
         # Method to format message for reporting component precedence violations
         def component_problem(c1, c2)
           problem "`#{format_component(c1)}` (line #{line_number(c1)}) should be put before `#{format_component(c2)}` (line #{line_number(c2)})"
@@ -99,7 +97,7 @@ module RuboCop
             line_breaks = (order_idx > 8) ? "\n\n" : "\n"
             corrector.insert_before(node2.source_range, node1.source + line_breaks + indentation)
           end
-          corrector.remove(range_with_surrounding_space(node1.source_range, :left))
+          corrector.remove(range_with_surrounding_space(range: node1.source_range, side: :left))
         end
 
         # Returns precedence index and component's index to properly reorder and group during autocorrect
diff --git a/Library/Homebrew/rubocops/extend/formula_cop.rb b/Library/Homebrew/rubocops/extend/formula_cop.rb
index de369a0aa5..e53c02a449 100644
--- a/Library/Homebrew/rubocops/extend/formula_cop.rb
+++ b/Library/Homebrew/rubocops/extend/formula_cop.rb
@@ -425,7 +425,7 @@ module RuboCop
 
       # Returns the block length of the block node
       def block_size(block)
-        block_length(block)
+        block.loc.end.line - block.loc.begin.line
       end
 
       # Source buffer is required as an argument to report style violations
diff --git a/Library/Homebrew/rubocops/formula_desc_cop.rb b/Library/Homebrew/rubocops/formula_desc_cop.rb
index 8a35e7d249..240a280723 100644
--- a/Library/Homebrew/rubocops/formula_desc_cop.rb
+++ b/Library/Homebrew/rubocops/formula_desc_cop.rb
@@ -88,8 +88,6 @@ module RuboCop
           problem "Description shouldn't end with a full stop"
         end
 
-        private
-
         def autocorrect(node)
           lambda do |corrector|
             correction = node.source
diff --git a/Library/Homebrew/rubocops/urls_cop.rb b/Library/Homebrew/rubocops/urls_cop.rb
index 414f633c97..4ef801689d 100644
--- a/Library/Homebrew/rubocops/urls_cop.rb
+++ b/Library/Homebrew/rubocops/urls_cop.rb
@@ -206,8 +206,6 @@ module RuboCop
           end
         end
 
-        private
-
         def autocorrect(node)
           lambda do |corrector|
             url_string_node = parameters(node).first
diff --git a/Library/Homebrew/test/Gemfile b/Library/Homebrew/test/Gemfile
index 2dcb670aa3..b6d1405ff6 100644
--- a/Library/Homebrew/test/Gemfile
+++ b/Library/Homebrew/test/Gemfile
@@ -3,7 +3,6 @@ source "https://rubygems.org"
 require_relative "../constants"
 
 gem "parallel_tests"
-gem "parser", HOMEBREW_RUBOCOP_PARSER_VERSION
 gem "rspec"
 gem "rspec-its", require: false
 gem "rspec-wait", require: false
diff --git a/Library/Homebrew/test/Gemfile.lock b/Library/Homebrew/test/Gemfile.lock
index 9ddc18e71e..47f51e56bb 100644
--- a/Library/Homebrew/test/Gemfile.lock
+++ b/Library/Homebrew/test/Gemfile.lock
@@ -12,12 +12,10 @@ GEM
     parallel (1.12.0)
     parallel_tests (2.17.0)
       parallel
-    parser (2.4.0.0)
-      ast (~> 2.2)
+    parser (2.4.0.2)
+      ast (~> 2.3)
     powerpack (0.1.1)
-    rainbow (2.2.2)
-      rake
-    rake (12.1.0)
+    rainbow (3.0.0)
     rspec (3.6.0)
       rspec-core (~> 3.6.0)
       rspec-expectations (~> 3.6.0)
@@ -36,11 +34,11 @@ GEM
     rspec-support (3.6.0)
     rspec-wait (0.0.9)
       rspec (>= 3, < 4)
-    rubocop (0.51.0)
+    rubocop (0.52.1)
       parallel (~> 1.10)
-      parser (>= 2.3.3.1, < 3.0)
+      parser (>= 2.4.0.2, < 3.0)
       powerpack (~> 0.1)
-      rainbow (>= 2.2.2, < 3.0)
+      rainbow (>= 2.2.2, < 4.0)
       ruby-progressbar (~> 1.7)
       unicode-display_width (~> 1.0, >= 1.0.1)
     ruby-progressbar (1.9.0)
@@ -58,11 +56,10 @@ PLATFORMS
 DEPENDENCIES
   codecov
   parallel_tests
-  parser (= 2.4.0.0)
   rspec
   rspec-its
   rspec-wait
-  rubocop (= 0.51.0)
+  rubocop (= 0.52.1)
   simplecov
 
 BUNDLED WITH
diff --git a/Library/Homebrew/test/cmd/style_spec.rb b/Library/Homebrew/test/cmd/style_spec.rb
index 5c118f32ec..61faa4af2a 100644
--- a/Library/Homebrew/test/cmd/style_spec.rb
+++ b/Library/Homebrew/test/cmd/style_spec.rb
@@ -28,7 +28,7 @@ describe "brew style" do
       rubocop_result = Homebrew.check_style_json([formula])
 
       expect(rubocop_result.file_offenses(formula.realpath.to_s).map(&:message))
-        .to include("Extra empty line detected at class body beginning.")
+        .to include("Layout/EmptyLinesAroundClassBody: Extra empty line detected at class body beginning.")
     end
   end
 end