diff --git a/.rubocop_todo.yml b/.rubocop_todo.yml
index d899959e7..31962cf4b 100644
--- a/.rubocop_todo.yml
+++ b/.rubocop_todo.yml
@@ -1,6 +1,6 @@
 # This configuration was generated by
 # `rubocop --auto-gen-config`
-# on 2019-02-27 21:48:38 +0100 using RuboCop version 0.65.0.
+# on 2019-02-28 17:29:46 +0000 using RuboCop version 0.65.0.
 # The point is for the user to remove these configuration records
 # one by one as the offenses are removed from the code base.
 # Note that changes in the inspected code, or installation of new
@@ -572,61 +572,7 @@ Style/StructInheritance:
     - 'lib/faraday/request.rb'
     - 'spec/faraday/rack_builder_spec.rb'
 
-# Offense count: 6
-# Cop supports --auto-correct.
-# Configuration parameters: MinSize.
-# SupportedStyles: percent, brackets
-Style/SymbolArray:
-  EnforcedStyle: brackets
-
-# Offense count: 7
-# Cop supports --auto-correct.
-# Configuration parameters: IgnoredMethods.
-# IgnoredMethods: respond_to, define_method
-Style/SymbolProc:
-  Exclude:
-    - 'lib/faraday/options.rb'
-    - 'lib/faraday/upload_io.rb'
-    - 'lib/faraday/utils/headers.rb'
-    - 'spec/support/helper_methods.rb'
-    - 'test/shared.rb'
-
-# Offense count: 3
-# Cop supports --auto-correct.
-# Configuration parameters: EnforcedStyle, AllowSafeAssignment.
-# SupportedStyles: require_parentheses, require_no_parentheses, require_parentheses_when_complex
-Style/TernaryParentheses:
-  Exclude:
-    - 'lib/faraday/adapter/test.rb'
-    - 'lib/faraday/options.rb'
-    - 'lib/faraday/upload_io.rb'
-
-# Offense count: 1
-# Cop supports --auto-correct.
-# Configuration parameters: ExactNameMatch, AllowPredicates, AllowDSLWriters, IgnoreClassMethods, Whitelist.
-# Whitelist: to_ary, to_a, to_c, to_enum, to_h, to_hash, to_i, to_int, to_io, to_open, to_path, to_proc, to_r, to_regexp, to_str, to_s, to_sym
-Style/TrivialAccessors:
-  Exclude:
-    - 'lib/faraday/utils/headers.rb'
-
-# Offense count: 2
-# Cop supports --auto-correct.
-Style/UnlessElse:
-  Exclude:
-    - 'lib/faraday/adapter/em_http.rb'
-    - 'lib/faraday/adapter/em_http_ssl_patch.rb'
-
-# Offense count: 5
-# Cop supports --auto-correct.
-# Configuration parameters: EnforcedStyle.
-# SupportedStyles: forbid_for_all_comparison_operators, forbid_for_equality_operators_only, require_for_all_comparison_operators, require_for_equality_operators_only
-Style/YodaCondition:
-  Exclude:
-    - 'lib/faraday/adapter/net_http.rb'
-    - 'script/proxy-server'
-    - 'test/helper.rb'
-
-# Offense count: 272
+# Offense count: 271
 # Configuration parameters: AllowHeredoc, AllowURI, URISchemes, IgnoreCopDirectives, IgnoredPatterns.
 # URISchemes: http, https
 Metrics/LineLength:
diff --git a/lib/faraday/adapter/em_http.rb b/lib/faraday/adapter/em_http.rb
index 085fa72a5..ad8d8083e 100644
--- a/lib/faraday/adapter/em_http.rb
+++ b/lib/faraday/adapter/em_http.rb
@@ -107,29 +107,27 @@ def perform_request(env)
             perform_single_request(env)
               .callback { env[:response].finish(env) }
           }
+        elsif EventMachine.reactor_running?
+          # EM is running: instruct upstream that this is an async request
+          env[:parallel_manager] = true
+          perform_single_request(env)
+            .callback { env[:response].finish(env) }
+            .errback {
+              # TODO: no way to communicate the error in async mode
+              raise NotImplementedError
+            }
         else
-          unless EventMachine.reactor_running?
-            error = nil
-            # start EM, block until request is completed
-            EventMachine.run do
-              perform_single_request(env)
-                .callback { EventMachine.stop }
-                .errback { |client|
-                  error = error_message(client)
-                  EventMachine.stop
-                }
-            end
-            raise_error(error) if error
-          else
-            # EM is running: instruct upstream that this is an async request
-            env[:parallel_manager] = true
+          error = nil
+          # start EM, block until request is completed
+          EventMachine.run do
             perform_single_request(env)
-              .callback { env[:response].finish(env) }
-              .errback {
-                # TODO: no way to communicate the error in async mode
-                raise NotImplementedError
+              .callback { EventMachine.stop }
+              .errback { |client|
+                error = error_message(client)
+                EventMachine.stop
               }
           end
+          raise_error(error) if error
         end
       rescue EventMachine::Connectify::CONNECTError => err
         if err.message.include?('Proxy Authentication Required')
diff --git a/lib/faraday/adapter/em_http_ssl_patch.rb b/lib/faraday/adapter/em_http_ssl_patch.rb
index 0339c4642..d1122302b 100644
--- a/lib/faraday/adapter/em_http_ssl_patch.rb
+++ b/lib/faraday/adapter/em_http_ssl_patch.rb
@@ -30,10 +30,10 @@ def ssl_verify_peer(cert_string)
   def ssl_handshake_completed
     return true unless verify_peer?
 
-    unless OpenSSL::SSL.verify_certificate_identity(@last_seen_cert, host)
-      raise OpenSSL::SSL::SSLError.new(%(host "#{host}" does not match the server certificate))
-    else
+    if OpenSSL::SSL.verify_certificate_identity(@last_seen_cert, host)
       true
+    else
+      raise OpenSSL::SSL::SSLError.new(%(host "#{host}" does not match the server certificate))
     end
   end
 
diff --git a/lib/faraday/adapter/net_http.rb b/lib/faraday/adapter/net_http.rb
index 84ee0cdd3..5c213b371 100644
--- a/lib/faraday/adapter/net_http.rb
+++ b/lib/faraday/adapter/net_http.rb
@@ -70,7 +70,7 @@ def create_request(env)
         request = Net::HTTPGenericRequest.new \
           env[:method].to_s.upcase,    # request method
           !!env[:body],                # is there request body
-          :head != env[:method],       # is there response body
+          env[:method] != :head,       # is there response body
           env[:url].request_uri,       # request uri path
           env[:request_headers]        # request headers
 
@@ -103,7 +103,7 @@ def perform_request(http, env)
       end
 
       def perform_request_with_wrapped_block(http, env, &block)
-        if (:get == env[:method]) && !env[:body]
+        if (env[:method] == :get) && !env[:body]
           # prefer `get` to `request` because the former handles gzip (ruby 1.9)
           request_via_get_method(http, env, &block)
         else
diff --git a/lib/faraday/adapter/net_http_persistent.rb b/lib/faraday/adapter/net_http_persistent.rb
index 3035d89be..7111659f8 100644
--- a/lib/faraday/adapter/net_http_persistent.rb
+++ b/lib/faraday/adapter/net_http_persistent.rb
@@ -10,7 +10,7 @@ class NetHttpPersistent < NetHttp
 
       def net_http_connection(env)
         @cached_connection ||=
-          if Net::HTTP::Persistent.instance_method(:initialize).parameters.first == [:key, :name]
+          if Net::HTTP::Persistent.instance_method(:initialize).parameters.first == %i[key name]
             options = { name: 'Faraday' }
             options[:pool_size] = @connection_options[:pool_size] if @connection_options.key?(:pool_size)
             Net::HTTP::Persistent.new(options)
diff --git a/lib/faraday/adapter/test.rb b/lib/faraday/adapter/test.rb
index ae8f0672d..a59893849 100644
--- a/lib/faraday/adapter/test.rb
+++ b/lib/faraday/adapter/test.rb
@@ -202,7 +202,7 @@ def call(env)
           env[:params] = (query = env[:url].query) ?
             params_encoder.decode(query) : {}
           block_arity = stub.block.arity
-          status, headers, body = (block_arity >= 0) ?
+          status, headers, body = block_arity >= 0 ?
             stub.block.call(*[env, meta].take(block_arity)) :
             stub.block.call(env, meta)
           save_response(env, status, body, headers)
diff --git a/lib/faraday/connection.rb b/lib/faraday/connection.rb
index 6ee5741d8..9f6624020 100644
--- a/lib/faraday/connection.rb
+++ b/lib/faraday/connection.rb
@@ -14,7 +14,7 @@ module Faraday
   #
   class Connection
     # A Set of allowed HTTP verbs.
-    METHODS = Set.new [:get, :post, :put, :delete, :head, :patch, :options, :trace, :connect]
+    METHODS = Set.new %i[get post put delete head patch options trace connect]
 
     # @return [Hash] URI query unencoded key/value pairs.
     attr_reader :params
diff --git a/lib/faraday/options.rb b/lib/faraday/options.rb
index 5b87d7907..6240f78c8 100644
--- a/lib/faraday/options.rb
+++ b/lib/faraday/options.rb
@@ -52,7 +52,7 @@ def merge!(other)
       other.each do |key, other_value|
         self_value = send(key)
         sub_options = self.class.options_for(key)
-        new_value = (self_value && sub_options && other_value) ? self_value.merge(other_value) : other_value
+        new_value = self_value && sub_options && other_value ? self_value.merge(other_value) : other_value
         send("#{key}=", new_value) unless new_value.nil?
       end
       self
@@ -188,7 +188,7 @@ def [](key)
     end
 
     def symbolized_key_set
-      @symbolized_key_set ||= Set.new(keys.map { |k| k.to_sym })
+      @symbolized_key_set ||= Set.new(keys.map(&:to_sym))
     end
 
     def self.inherited(subclass)
diff --git a/lib/faraday/request/retry.rb b/lib/faraday/request/retry.rb
index 38b7659c1..a9fcab109 100644
--- a/lib/faraday/request/retry.rb
+++ b/lib/faraday/request/retry.rb
@@ -23,7 +23,7 @@ module Faraday
   # interval that is random between 0.1 and 0.15.
   class Request::Retry < Faraday::Middleware
     DEFAULT_EXCEPTIONS = [Errno::ETIMEDOUT, 'Timeout::Error', Faraday::TimeoutError, Faraday::RetriableResponse].freeze
-    IDEMPOTENT_METHODS = [:delete, :get, :head, :options, :put]
+    IDEMPOTENT_METHODS = %i[delete get head options put]
 
     class Options < Faraday::Options.new(:max, :interval, :max_interval, :interval_randomness,
                                          :backoff_factor, :exceptions, :methods, :retry_if, :retry_block,
diff --git a/lib/faraday/upload_io.rb b/lib/faraday/upload_io.rb
index 5623432a4..932e3738b 100644
--- a/lib/faraday/upload_io.rb
+++ b/lib/faraday/upload_io.rb
@@ -14,7 +14,7 @@ module Faraday
   class CompositeReadIO
     def initialize(*parts)
       @parts = parts.flatten
-      @ios = @parts.map { |part| part.to_io }
+      @ios = @parts.map(&:to_io)
       @index = 0
     end
 
@@ -27,7 +27,7 @@ def length
     #
     # @return [void]
     def rewind
-      @ios.each { |io| io.rewind }
+      @ios.each(&:rewind)
       @index = 0
     end
 
@@ -49,14 +49,14 @@ def read(length = nil, outbuf = nil)
         end
         advance_io
       end
-      (!got_result && length) ? nil : outbuf
+      !got_result && length ? nil : outbuf
     end
 
     # Close each of the IOs.
     #
     # @return [void]
     def close
-      @ios.each { |io| io.close }
+      @ios.each(&:close)
     end
 
     def ensure_open_and_readable
diff --git a/lib/faraday/utils/headers.rb b/lib/faraday/utils/headers.rb
index de292c5dd..6ef9b4fa6 100644
--- a/lib/faraday/utils/headers.rb
+++ b/lib/faraday/utils/headers.rb
@@ -42,7 +42,7 @@ def initialize_copy(other)
                   key
                 else
                   key.to_s.split('_') # user_agent: %w(user agent)
-                     .each { |w| w.capitalize! } # => %w(User Agent)
+                     .each(&:capitalize!) # => %w(User Agent)
                      .join('-') # => "User-Agent"
                 end
         keymap_mutex.synchronize { map[key] = value }
@@ -125,9 +125,7 @@ def parse(header_string)
 
       protected
 
-      def names
-        @names
-      end
+      attr_reader :names
 
       private
 
diff --git a/script/proxy-server b/script/proxy-server
index 12165e32c..642737604 100755
--- a/script/proxy-server
+++ b/script/proxy-server
@@ -28,7 +28,7 @@ webrick_opts = {
   ProxyAuthProc: lambda { |req, res|
     if username
       type, credentials = req.header['proxy-authorization'].first.to_s.split(/\s+/, 2)
-      unless 'Basic' == type && match_credentials.call(credentials)
+      unless type == 'Basic' && match_credentials.call(credentials)
         res['proxy-authenticate'] = %{Basic realm="testing"}
         raise WEBrick::HTTPStatus::ProxyAuthenticationRequired
       end
diff --git a/spec/support/helper_methods.rb b/spec/support/helper_methods.rb
index 79ed993b2..28e196409 100644
--- a/spec/support/helper_methods.rb
+++ b/spec/support/helper_methods.rb
@@ -93,7 +93,7 @@ def method_with_body?(method)
 
     def big_string
       kb = 1024
-      (32..126).map { |i| i.chr }.cycle.take(50 * kb).join
+      (32..126).map(&:chr).cycle.take(50 * kb).join
     end
   end
 end
diff --git a/test/helper.rb b/test/helper.rb
index d9c718b2e..417d67888 100644
--- a/test/helper.rb
+++ b/test/helper.rb
@@ -59,11 +59,11 @@ def capture_warnings
     end
 
     def self.jruby?
-      defined? RUBY_ENGINE && ('jruby' == RUBY_ENGINE)
+      defined? RUBY_ENGINE && (RUBY_ENGINE == 'jruby')
     end
 
     def self.rbx?
-      defined? RUBY_ENGINE && ('rbx' == RUBY_ENGINE)
+      defined? RUBY_ENGINE && (RUBY_ENGINE == 'rbx')
     end
 
     def self.ruby_22_plus?
diff --git a/test/live_server.rb b/test/live_server.rb
index be74e2436..a9ed560b3 100644
--- a/test/live_server.rb
+++ b/test/live_server.rb
@@ -9,7 +9,7 @@ class LiveServer < Sinatra::Base
     disable :logging
     disable :protection
 
-    [:get, :post, :put, :patch, :delete, :options].each do |method|
+    %i[get post put patch delete options].each do |method|
       send(method, '/echo') do
         kind = request.request_method.downcase
         out = kind.dup
@@ -21,7 +21,7 @@ class LiveServer < Sinatra::Base
       end
     end
 
-    [:get, :post].each do |method|
+    %i[get post].each do |method|
       send(method, '/stream') do
         content_type :txt
         stream do |out|
@@ -32,7 +32,7 @@ class LiveServer < Sinatra::Base
       end
     end
 
-    [:get, :post].each do |method|
+    %i[get post].each do |method|
       send(method, '/empty_stream') do
         content_type :txt
         stream do |out|
diff --git a/test/shared.rb b/test/shared.rb
index 5d0c26fc4..3462a4162 100644
--- a/test/shared.rb
+++ b/test/shared.rb
@@ -4,7 +4,7 @@ module Faraday
   module Shared
     def self.big_string
       kb = 1024
-      (32..126).map { |i| i.chr }.cycle.take(50 * kb).join
+      (32..126).map(&:chr).cycle.take(50 * kb).join
     end
 
     def big_string