diff --git a/grpc.gemspec b/grpc.gemspec
index 2b41f134691..d3779a9991e 100644
--- a/grpc.gemspec
+++ b/grpc.gemspec
@@ -33,12 +33,12 @@ Gem::Specification.new do |s|
   s.add_development_dependency 'bundler',            '~> 1.9'
   s.add_development_dependency 'facter',             '~> 2.4'
   s.add_development_dependency 'logging',            '~> 2.0'
-  s.add_development_dependency 'simplecov',          '~> 0.9'
-  s.add_development_dependency 'rake',               '~> 10.4'
+  s.add_development_dependency 'simplecov',          '~> 0.14.1'
+  s.add_development_dependency 'rake',               '~> 12.0'
   s.add_development_dependency 'rake-compiler',      '~> 1.0'
   s.add_development_dependency 'rake-compiler-dock', '~> 0.5.1'
-  s.add_development_dependency 'rspec',              '~> 3.2'
-  s.add_development_dependency 'rubocop',            '~> 0.30.0'
+  s.add_development_dependency 'rspec',              '~> 3.6'
+  s.add_development_dependency 'rubocop',            '~> 0.49.1'
   s.add_development_dependency 'signet',             '~> 0.7.0'
 
   s.extensions = %w(src/ruby/ext/grpc/extconf.rb)
diff --git a/src/ruby/.rubocop_todo.yml b/src/ruby/.rubocop_todo.yml
index 05db4045825..32b84b8de0e 100644
--- a/src/ruby/.rubocop_todo.yml
+++ b/src/ruby/.rubocop_todo.yml
@@ -1,44 +1,569 @@
-# This configuration was generated by `rubocop --auto-gen-config`
-# on 2015-05-22 13:23:34 -0700 using RuboCop version 0.30.1.
+# This configuration was generated by
+# `rubocop --auto-gen-config`
+# on 2017-09-04 17:00:36 +0200 using RuboCop version 0.49.1.
 # 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
 # versions of RuboCop, may require this file to be generated again.
 
-# Offense count: 30
-Metrics/AbcSize:
-  Max: 38
+# Offense count: 3
+# Cop supports --auto-correct.
+# Configuration parameters: EnforcedStyle, SupportedStyles, IndentOneStep, IndentationWidth.
+# SupportedStyles: case, end
+Layout/CaseIndentation:
+  Exclude:
+    - 'tools/platform_check.rb'
+
+# Offense count: 1
+# Cop supports --auto-correct.
+Layout/CommentIndentation:
+  Exclude:
+    - 'qps/client.rb'
+
+# Offense count: 1
+# Cop supports --auto-correct.
+Layout/EmptyLineAfterMagicComment:
+  Exclude:
+    - 'tools/grpc-tools.gemspec'
+
+# Offense count: 33
+# Cop supports --auto-correct.
+# Configuration parameters: AllowAdjacentOneLineDefs, NumberOfEmptyLines.
+Layout/EmptyLineBetweenDefs:
+  Exclude:
+    - 'qps/client.rb'
+    - 'qps/histogram.rb'
+    - 'qps/proxy-worker.rb'
+    - 'qps/server.rb'
+    - 'qps/worker.rb'
+
+# Offense count: 1
+# Cop supports --auto-correct.
+Layout/EmptyLines:
+  Exclude:
+    - 'qps/qps-common.rb'
+
+# Offense count: 8
+# Cop supports --auto-correct.
+# Configuration parameters: EnforcedStyle, SupportedStyles.
+# SupportedStyles: empty_lines, empty_lines_except_namespace, empty_lines_special, no_empty_lines
+Layout/EmptyLinesAroundClassBody:
+  Exclude:
+    - 'pb/grpc/testing/duplicate/echo_duplicate_services_pb.rb'
+    - 'pb/grpc/testing/metrics_services_pb.rb'
+    - 'pb/src/proto/grpc/testing/test_services_pb.rb'
+    - 'qps/src/proto/grpc/testing/proxy-service_services_pb.rb'
+    - 'qps/src/proto/grpc/testing/services_services_pb.rb'
+
+# Offense count: 28
+# Cop supports --auto-correct.
+# Configuration parameters: AllowForAlignment, ForceEqualSignAlignment.
+Layout/ExtraSpacing:
+  Enabled: false
+
+# Offense count: 1
+# Cop supports --auto-correct.
+# Configuration parameters: EnforcedStyle, SupportedStyles.
+# SupportedStyles: normal, rails
+Layout/IndentationConsistency:
+  Exclude:
+    - 'pb/grpc/health/checker.rb'
+
+# Offense count: 1
+# Cop supports --auto-correct.
+# Configuration parameters: Width, IgnoredPatterns.
+Layout/IndentationWidth:
+  Exclude:
+    - 'pb/grpc/health/checker.rb'
+
+# Offense count: 1
+# Cop supports --auto-correct.
+# Configuration parameters: EnforcedStyle, SupportedStyles.
+# SupportedStyles: symmetrical, new_line, same_line
+Layout/MultilineHashBraceLayout:
+  Exclude:
+    - 'spec/generic/active_call_spec.rb'
+
+# Offense count: 70
+# Cop supports --auto-correct.
+# Configuration parameters: EnforcedStyle, SupportedStyles.
+# SupportedStyles: symmetrical, new_line, same_line
+Layout/MultilineMethodCallBraceLayout:
+  Enabled: false
+
+# Offense count: 2
+# Cop supports --auto-correct.
+# Configuration parameters: EnforcedStyle, SupportedStyles, IndentationWidth.
+# SupportedStyles: aligned, indented, indented_relative_to_receiver
+Layout/MultilineMethodCallIndentation:
+  Exclude:
+    - 'spec/generic/rpc_desc_spec.rb'
+
+# Offense count: 1
+# Cop supports --auto-correct.
+# Configuration parameters: EnforcedStyle, SupportedStyles.
+# SupportedStyles: symmetrical, new_line, same_line
+Layout/MultilineMethodDefinitionBraceLayout:
+  Exclude:
+    - 'spec/generic/client_stub_spec.rb'
+
+# Offense count: 5
+# Cop supports --auto-correct.
+Layout/SpaceAfterColon:
+  Exclude:
+    - 'lib/grpc/generic/rpc_server.rb'
+
+# Offense count: 7
+# Cop supports --auto-correct.
+Layout/SpaceAfterComma:
+  Exclude:
+    - 'qps/client.rb'
+
+# Offense count: 27
+# Cop supports --auto-correct.
+# Configuration parameters: AllowForAlignment.
+Layout/SpaceAroundOperators:
+  Exclude:
+    - 'qps/client.rb'
+    - 'qps/histogram.rb'
+    - 'qps/proxy-worker.rb'
+    - 'qps/server.rb'
+    - 'spec/generic/active_call_spec.rb'
+    - 'spec/generic/rpc_server_spec.rb'
+
+# Offense count: 1
+# Cop supports --auto-correct.
+# Configuration parameters: EnforcedStyle, SupportedStyles, EnforcedStyleForEmptyBraces, SupportedStylesForEmptyBraces, SpaceBeforeBlockParameters.
+# SupportedStyles: space, no_space
+# SupportedStylesForEmptyBraces: space, no_space
+Layout/SpaceInsideBlockBraces:
+  Exclude:
+    - 'stress/stress_client.rb'
+
+# Offense count: 4
+# Cop supports --auto-correct.
+Layout/SpaceInsideBrackets:
+  Exclude:
+    - 'tools/bin/grpc_tools_ruby_protoc'
+    - 'tools/bin/grpc_tools_ruby_protoc_plugin'
+
+# Offense count: 2
+# Cop supports --auto-correct.
+# Configuration parameters: EnforcedStyle, SupportedStyles, EnforcedStyleForEmptyBraces, SupportedStylesForEmptyBraces.
+# SupportedStyles: space, no_space, compact
+# SupportedStylesForEmptyBraces: space, no_space
+Layout/SpaceInsideHashLiteralBraces:
+  Exclude:
+    - 'qps/server.rb'
+
+# Offense count: 6
+# Cop supports --auto-correct.
+Layout/SpaceInsidePercentLiteralDelimiters:
+  Exclude:
+    - 'spec/generic/client_stub_spec.rb'
+    - 'tools/grpc-tools.gemspec'
 
 # Offense count: 3
-# Configuration parameters: CountComments.
-Metrics/ClassLength:
-  Max: 200
+# Cop supports --auto-correct.
+Layout/Tab:
+  Exclude:
+    - 'pb/grpc/health/checker.rb'
+    - 'qps/client.rb'
+
+# Offense count: 1
+# Cop supports --auto-correct.
+Layout/TrailingWhitespace:
+  Exclude:
+    - 'qps/worker.rb'
+
+# Offense count: 1
+Lint/IneffectiveAccessModifier:
+  Exclude:
+    - 'lib/grpc/generic/active_call.rb'
+
+# Offense count: 4
+# Cop supports --auto-correct.
+Lint/PercentStringArray:
+  Exclude:
+    - 'spec/client_server_spec.rb'
+    - 'spec/generic/active_call_spec.rb'
+    - 'spec/generic/client_stub_spec.rb'
+
+# Offense count: 4
+Lint/ScriptPermission:
+  Exclude:
+    - 'qps/client.rb'
+    - 'qps/histogram.rb'
+    - 'qps/qps-common.rb'
+    - 'qps/server.rb'
+
+# Offense count: 2
+# Cop supports --auto-correct.
+# Configuration parameters: IgnoreEmptyBlocks, AllowUnusedKeywordArguments.
+Lint/UnusedBlockArgument:
+  Exclude:
+    - 'qps/client.rb'
+
+# Offense count: 2
+# Cop supports --auto-correct.
+# Configuration parameters: AllowUnusedKeywordArguments, IgnoreEmptyMethods.
+Lint/UnusedMethodArgument:
+  Exclude:
+    - 'qps/client.rb'
+
+# Offense count: 1
+# Configuration parameters: ContextCreatingMethods, MethodCreatingMethods.
+Lint/UselessAccessModifier:
+  Exclude:
+    - 'lib/grpc/logconfig.rb'
+
+# Offense count: 1
+Lint/UselessAssignment:
+  Exclude:
+    - 'qps/client.rb'
 
-# Offense count: 35
+# Offense count: 4
+Lint/Void:
+  Exclude:
+    - 'stress/metrics_server.rb'
+    - 'stress/stress_client.rb'
+
+# Offense count: 53
+Metrics/AbcSize:
+  Max: 57
+
+# Offense count: 81
+# Configuration parameters: CountComments, ExcludedMethods.
+Metrics/BlockLength:
+  Max: 715
+
+# Offense count: 82
+# Configuration parameters: AllowHeredoc, AllowURI, URISchemes, IgnoreCopDirectives, IgnoredPatterns.
+# URISchemes: http, https
+Metrics/LineLength:
+  Max: 141
+
+# Offense count: 82
 # Configuration parameters: CountComments.
 Metrics/MethodLength:
-  Max: 36
+  Max: 54
 
-# Offense count: 7
+# Offense count: 5
 # Configuration parameters: CountKeywordArgs.
 Metrics/ParameterLists:
-  Max: 8
+  Max: 7
+
+# Offense count: 1
+# Cop supports --auto-correct.
+Performance/RedundantBlockCall:
+  Exclude:
+    - 'spec/generic/client_stub_spec.rb'
+
+# Offense count: 5
+# Cop supports --auto-correct.
+# Configuration parameters: MaxKeyValuePairs.
+Performance/RedundantMerge:
+  Exclude:
+    - 'spec/generic/active_call_spec.rb'
+    - 'spec/generic/client_stub_spec.rb'
+
+# Offense count: 8
+# Cop supports --auto-correct.
+Performance/TimesMap:
+  Exclude:
+    - 'spec/channel_spec.rb'
+    - 'spec/client_server_spec.rb'
+    - 'spec/server_spec.rb'
+
+# Offense count: 7
+Style/AccessorMethodName:
+  Exclude:
+    - 'qps/server.rb'
+    - 'stress/metrics_server.rb'
+    - 'stress/stress_client.rb'
+
+# Offense count: 2
+# Cop supports --auto-correct.
+# Configuration parameters: EnforcedStyle, SupportedStyles.
+# SupportedStyles: prefer_alias, prefer_alias_method
+Style/Alias:
+  Exclude:
+    - 'lib/grpc/generic/rpc_server.rb'
+    - 'lib/grpc/notifier.rb'
+
+# Offense count: 7
+# Cop supports --auto-correct.
+# Configuration parameters: EnforcedStyle, SupportedStyles, ProceduralMethods, FunctionalMethods, IgnoredMethods.
+# SupportedStyles: line_count_based, semantic, braces_for_chaining
+# ProceduralMethods: benchmark, bm, bmbm, create, each_with_object, measure, new, realtime, tap, with_object
+# FunctionalMethods: let, let!, subject, watch
+# IgnoredMethods: lambda, proc, it
+Style/BlockDelimiters:
+  Exclude:
+    - 'qps/client.rb'
+    - 'qps/proxy-worker.rb'
+    - 'qps/server.rb'
+    - 'qps/worker.rb'
+
+# Offense count: 2
+# Cop supports --auto-correct.
+Style/ClassMethods:
+  Exclude:
+    - 'tools/platform_check.rb'
+
+# Offense count: 2
+# Cop supports --auto-correct.
+# Configuration parameters: EnforcedStyle, SupportedStyles, SingleLineConditionsOnly, IncludeTernaryExpressions.
+# SupportedStyles: assign_to_condition, assign_inside_condition
+Style/ConditionalAssignment:
+  Exclude:
+    - 'lib/grpc/generic/rpc_server.rb'
+    - 'lib/grpc/generic/service.rb'
+
+# Offense count: 19
+Style/Documentation:
+  Exclude:
+    - 'spec/**/*'
+    - 'test/**/*'
+    - 'pb/grpc/testing/duplicate/echo_duplicate_services_pb.rb'
+    - 'pb/grpc/testing/metrics_services_pb.rb'
+    - 'pb/src/proto/grpc/testing/test_pb.rb'
+    - 'qps/client.rb'
+    - 'qps/histogram.rb'
+    - 'qps/proxy-worker.rb'
+    - 'qps/server.rb'
+    - 'qps/src/proto/grpc/testing/proxy-service_services_pb.rb'
+    - 'qps/src/proto/grpc/testing/services_pb.rb'
+    - 'qps/src/proto/grpc/testing/services_services_pb.rb'
+    - 'qps/worker.rb'
+    - 'stress/metrics_server.rb'
+    - 'stress/stress_client.rb'
+    - 'tools/platform_check.rb'
 
-# Offense count: 9
+# Offense count: 8
+# Cop supports --auto-correct.
+# Configuration parameters: EnforcedStyle, SupportedStyles.
+# SupportedStyles: compact, expanded
+Style/EmptyMethod:
+  Exclude:
+    - 'bin/noproto_server.rb'
+    - 'lib/grpc/logconfig.rb'
+    - 'spec/generic/rpc_desc_spec.rb'
+
+# Offense count: 2
+# Configuration parameters: ExpectMatchingDefinition, Regex, IgnoreExecutableScripts, AllowedAcronyms.
+# AllowedAcronyms: CLI, DSL, ACL, API, ASCII, CPU, CSS, DNS, EOF, GUID, HTML, HTTP, HTTPS, ID, IP, JSON, LHS, QPS, RAM, RHS, RPC, SLA, SMTP, SQL, SSH, TCP, TLS, TTL, UDP, UI, UID, UUID, URI, URL, UTF8, VM, XML, XMPP, XSRF, XSS
+Style/FileName:
+  Exclude:
+    - 'qps/src/proto/grpc/testing/proxy-service_pb.rb'
+    - 'qps/src/proto/grpc/testing/proxy-service_services_pb.rb'
+
+# Offense count: 12
 # Configuration parameters: AllowedVariables.
 Style/GlobalVars:
-  Enabled: false
+  Exclude:
+    - 'ext/grpc/extconf.rb'
+
+# Offense count: 3
+# Configuration parameters: MinBodyLength.
+Style/GuardClause:
+  Exclude:
+    - 'lib/grpc/generic/bidi_call.rb'
+    - 'lib/grpc/generic/rpc_server.rb'
+    - 'qps/client.rb'
+
+# Offense count: 1
+# Cop supports --auto-correct.
+# Configuration parameters: EnforcedStyle, SupportedStyles, UseHashRocketsWithSymbolValues, PreferHashRocketsForNonAlnumEndingSymbols.
+# SupportedStyles: ruby19, hash_rockets, no_mixed_keys, ruby19_no_mixed_keys
+Style/HashSyntax:
+  Exclude:
+    - 'stress/metrics_server.rb'
+
+# Offense count: 1
+Style/IfInsideElse:
+  Exclude:
+    - 'lib/grpc/generic/rpc_desc.rb'
+
+# Offense count: 4
+# Cop supports --auto-correct.
+# Configuration parameters: MaxLineLength.
+Style/IfUnlessModifier:
+  Exclude:
+    - 'ext/grpc/extconf.rb'
+    - 'qps/histogram.rb'
+    - 'stress/stress_client.rb'
+
+# Offense count: 1
+# Cop supports --auto-correct.
+Style/MethodCallWithoutArgsParentheses:
+  Exclude:
+    - 'qps/client.rb'
+
+# Offense count: 3
+# Cop supports --auto-correct.
+Style/MultilineIfModifier:
+  Exclude:
+    - 'lib/grpc/generic/bidi_call.rb'
+    - 'lib/grpc/generic/client_stub.rb'
+    - 'spec/spec_helper.rb'
+
+# Offense count: 7
+# Cop supports --auto-correct.
+Style/MutableConstant:
+  Exclude:
+    - 'ext/grpc/extconf.rb'
+    - 'lib/grpc/version.rb'
+    - 'spec/compression_options_spec.rb'
+    - 'spec/generic/active_call_spec.rb'
+    - 'tools/version.rb'
 
 # Offense count: 1
-# Configuration parameters: EnforcedStyle, MinBodyLength, SupportedStyles.
-Style/Next:
+# Cop supports --auto-correct.
+Style/NegatedWhile:
+  Exclude:
+    - 'qps/client.rb'
+
+# Offense count: 1
+# Cop supports --auto-correct.
+# Configuration parameters: AutoCorrect, EnforcedStyle, SupportedStyles.
+# SupportedStyles: predicate, comparison
+Style/NumericPredicate:
+  Exclude:
+    - 'spec/**/*'
+    - 'ext/grpc/extconf.rb'
+
+# Offense count: 7
+# Cop supports --auto-correct.
+Style/ParallelAssignment:
+  Exclude:
+    - 'bin/math_server.rb'
+    - 'lib/grpc/generic/rpc_server.rb'
+    - 'spec/generic/client_stub_spec.rb'
+    - 'spec/generic/rpc_desc_spec.rb'
+    - 'spec/generic/rpc_server_pool_spec.rb'
+    - 'spec/generic/rpc_server_spec.rb'
+
+# Offense count: 8
+# Cop supports --auto-correct.
+# Configuration parameters: PreferredDelimiters.
+Style/PercentLiteralDelimiters:
+  Exclude:
+    - 'end2end/grpc_class_init_driver.rb'
+    - 'spec/client_server_spec.rb'
+    - 'spec/generic/active_call_spec.rb'
+    - 'spec/generic/client_stub_spec.rb'
+    - 'tools/grpc-tools.gemspec'
+
+# Offense count: 3
+# Cop supports --auto-correct.
+# Configuration parameters: EnforcedStyle, SupportedStyles.
+# SupportedStyles: compact, exploded
+Style/RaiseArgs:
+  Exclude:
+    - 'stress/metrics_server.rb'
+
+# Offense count: 4
+# Cop supports --auto-correct.
+Style/RedundantParentheses:
+  Exclude:
+    - 'lib/grpc/generic/rpc_server.rb'
+    - 'qps/client.rb'
+    - 'qps/proxy-worker.rb'
+    - 'spec/generic/rpc_desc_spec.rb'
+
+# Offense count: 5
+# Cop supports --auto-correct.
+# Configuration parameters: AllowMultipleReturnValues.
+Style/RedundantReturn:
+  Exclude:
+    - 'end2end/grpc_class_init_client.rb'
+
+# Offense count: 77
+# Cop supports --auto-correct.
+# Configuration parameters: EnforcedStyle, SupportedStyles.
+# SupportedStyles: only_raise, only_fail, semantic
+Style/SignalException:
   Enabled: false
 
 # Offense count: 2
-# Configuration parameters: Methods.
-Style/SingleLineBlockParams:
-  Enabled: false
+# Cop supports --auto-correct.
+# Configuration parameters: EnforcedStyle, SupportedStyles.
+# SupportedStyles: use_perl_names, use_english_names
+Style/SpecialGlobalVars:
+  Exclude:
+    - 'ext/grpc/extconf.rb'
+    - 'stress/stress_client.rb'
+
+# Offense count: 189
+# Cop supports --auto-correct.
+# Configuration parameters: EnforcedStyle, SupportedStyles, ConsistentQuotesInMultiline.
+# SupportedStyles: single_quotes, double_quotes
+Style/StringLiterals:
+  Exclude:
+    - 'pb/grpc/testing/metrics_pb.rb'
+    - 'pb/src/proto/grpc/testing/empty_pb.rb'
+    - 'pb/src/proto/grpc/testing/messages_pb.rb'
+    - 'qps/proxy-worker.rb'
+    - 'qps/server.rb'
+    - 'qps/src/proto/grpc/testing/control_pb.rb'
+    - 'qps/src/proto/grpc/testing/messages_pb.rb'
+    - 'qps/src/proto/grpc/testing/payloads_pb.rb'
+    - 'qps/src/proto/grpc/testing/proxy-service_pb.rb'
+    - 'qps/src/proto/grpc/testing/stats_pb.rb'
+    - 'qps/worker.rb'
 
 # Offense count: 1
 Style/StructInheritance:
-  Enabled: false
+  Exclude:
+    - 'lib/grpc/generic/rpc_desc.rb'
+
+# Offense count: 10
+# Cop supports --auto-correct.
+# Configuration parameters: MinSize, SupportedStyles.
+# SupportedStyles: percent, brackets
+Style/SymbolArray:
+  EnforcedStyle: brackets
+
+# Offense count: 2
+# Cop supports --auto-correct.
+# Configuration parameters: IgnoredMethods.
+# IgnoredMethods: respond_to, define_method
+Style/SymbolProc:
+  Exclude:
+    - 'qps/client.rb'
+    - 'stress/stress_client.rb'
+
+# Offense count: 6
+# Cop supports --auto-correct.
+# Configuration parameters: AllowNamedUnderscoreVariables.
+Style/TrailingUnderscoreVariable:
+  Exclude:
+    - 'spec/channel_credentials_spec.rb'
+    - 'spec/server_credentials_spec.rb'
+
+# Offense count: 3
+# 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:
+    - 'qps/histogram.rb'
+
+# Offense count: 3
+# Cop supports --auto-correct.
+Style/UnneededInterpolation:
+  Exclude:
+    - 'pb/grpc/health/checker.rb'
+
+# Offense count: 1
+# Cop supports --auto-correct.
+Style/YodaCondition:
+  Exclude:
+    - 'stress/stress_client.rb'
+
+# Offense count: 2
+# Cop supports --auto-correct.
+Style/ZeroLengthPredicate:
+  Exclude:
+    - 'lib/grpc/generic/rpc_server.rb'
diff --git a/src/ruby/end2end/grpc_class_init_client.rb b/src/ruby/end2end/grpc_class_init_client.rb
index b9e3d6054f6..c35719a71fd 100755
--- a/src/ruby/end2end/grpc_class_init_client.rb
+++ b/src/ruby/end2end/grpc_class_init_client.rb
@@ -41,7 +41,7 @@ def run_gc_stress_test(test_proc)
   GC.enable
   construct_many(test_proc)
 
-  GC.start(full_mark: true, immediate_sweep: true)
+  GC.start
   construct_many(test_proc)
 end
 
diff --git a/templates/grpc.gemspec.template b/templates/grpc.gemspec.template
index 8b5799306a1..e62e5b27215 100644
--- a/templates/grpc.gemspec.template
+++ b/templates/grpc.gemspec.template
@@ -35,12 +35,12 @@
     s.add_development_dependency 'bundler',            '~> 1.9'
     s.add_development_dependency 'facter',             '~> 2.4'
     s.add_development_dependency 'logging',            '~> 2.0'
-    s.add_development_dependency 'simplecov',          '~> 0.9'
-    s.add_development_dependency 'rake',               '~> 10.4'
+    s.add_development_dependency 'simplecov',          '~> 0.14.1'
+    s.add_development_dependency 'rake',               '~> 12.0'
     s.add_development_dependency 'rake-compiler',      '~> 1.0'
     s.add_development_dependency 'rake-compiler-dock', '~> 0.5.1'
-    s.add_development_dependency 'rspec',              '~> 3.2'
-    s.add_development_dependency 'rubocop',            '~> 0.30.0'
+    s.add_development_dependency 'rspec',              '~> 3.6'
+    s.add_development_dependency 'rubocop',            '~> 0.49.1'
     s.add_development_dependency 'signet',             '~> 0.7.0'
 
     s.extensions = %w(src/ruby/ext/grpc/extconf.rb)