Update dependencies configuration

Signed-off-by: Florian Wininger <fw.centrale@gmail.com>

6 files changed, 193 insertions, 115 deletions

diff --git a/.gitignore b/.gitignore
index 5cdbfd8..b02057e 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,4 +1,5 @@
 /Gemfile.lock
+/Gemfile.noed25519.lock
 doc
 rdoc
 ri
diff --git a/.rubocop_todo.yml b/.rubocop_todo.yml
index c07b37b..bd6502d 100644
--- a/.rubocop_todo.yml
+++ b/.rubocop_todo.yml
@@ -1,6 +1,6 @@
 # This configuration was generated by
 # `rubocop --auto-gen-config`
-# on 2019-08-12 17:58:13 +0200 using RuboCop version 0.54.0.
+# on 2019-08-17 17:53:05 +0200 using RuboCop version 0.74.0.
 # 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
@@ -9,8 +9,35 @@
 # Offense count: 78
 # Cop supports --auto-correct.
 # Configuration parameters: EnforcedStyle, IndentationWidth.
-# SupportedStyles: with_first_parameter, with_fixed_indentation
-Layout/AlignParameters:
+# SupportedStyles: with_first_argument, with_fixed_indentation
+Layout/AlignArguments:
+  Enabled: false
+
+# Offense count: 48
+# Cop supports --auto-correct.
+# Configuration parameters: AllowMultipleStyles, EnforcedHashRocketStyle, EnforcedColonStyle, EnforcedLastArgumentHashStyle.
+# SupportedHashRocketStyles: key, separator, table
+# SupportedColonStyles: key, separator, table
+# SupportedLastArgumentHashStyles: always_inspect, always_ignore, ignore_implicit, ignore_explicit
+Layout/AlignHash:
+  Exclude:
+    - 'lib/net/ssh/key_factory.rb'
+    - 'lib/net/ssh/transport/cipher_factory.rb'
+    - 'lib/net/ssh/transport/hmac.rb'
+    - 'lib/net/ssh/transport/kex.rb'
+    - 'test/test_config.rb'
+
+# Offense count: 4
+# Cop supports --auto-correct.
+Layout/ClosingHeredocIndentation:
+  Exclude:
+    - 'test/authentication/test_agent.rb'
+    - 'test/authentication/test_ed25519.rb'
+    - 'test/test_key_factory.rb'
+
+# Offense count: 74
+# Cop supports --auto-correct.
+Layout/EmptyLineAfterGuardClause:
   Enabled: false
 
 # Offense count: 189
@@ -22,14 +49,6 @@ Layout/EmptyLinesAroundModuleBody:
 
 # Offense count: 4
 # Cop supports --auto-correct.
-# Configuration parameters: EnforcedStyle, IndentationWidth.
-# SupportedStyles: special_inside_parentheses, consistent, align_brackets
-Layout/IndentArray:
-  Exclude:
-    - 'lib/net/ssh/transport/openssl.rb'
-
-# Offense count: 4
-# Cop supports --auto-correct.
 # Configuration parameters: IndentationWidth.
 Layout/IndentAssignment:
   Exclude:
@@ -38,10 +57,18 @@ Layout/IndentAssignment:
     - 'test/transport/kex/test_ecdh_sha2_nistp384.rb'
     - 'test/transport/kex/test_ecdh_sha2_nistp521.rb'
 
+# Offense count: 4
+# Cop supports --auto-correct.
+# Configuration parameters: EnforcedStyle, IndentationWidth.
+# SupportedStyles: special_inside_parentheses, consistent, align_brackets
+Layout/IndentFirstArrayElement:
+  Exclude:
+    - 'lib/net/ssh/transport/openssl.rb'
+
 # Offense count: 11
 # Cop supports --auto-correct.
 # Configuration parameters: EnforcedStyle.
-# SupportedStyles: auto_detection, squiggly, active_support, powerpack, unindent
+# SupportedStyles: squiggly, active_support, powerpack, unindent
 Layout/IndentHeredoc:
   Exclude:
     - 'test/authentication/test_agent.rb'
@@ -51,8 +78,33 @@ Layout/IndentHeredoc:
     - 'test/integration/test_agent.rb'
     - 'test/test_key_factory.rb'
 
+# Offense count: 2
+# Cop supports --auto-correct.
+# Configuration parameters: EnforcedStyle.
+# SupportedStyles: normal, indented_internal_methods
+Layout/IndentationConsistency:
+  Exclude:
+    - 'test/transport/kex/test_diffie_hellman_group_exchange_sha256.rb'
+
+# Offense count: 2
+# Cop supports --auto-correct.
+# Configuration parameters: Width, IgnoredPatterns.
+Layout/IndentationWidth:
+  Exclude:
+    - 'test/transport/kex/test_diffie_hellman_group_exchange_sha256.rb'
+
+# Offense count: 4
+# Cop supports --auto-correct.
+Layout/LeadingBlankLines:
+  Exclude:
+    - 'Rakefile'
+    - 'lib/net/ssh/authentication/pub_key_fingerprint.rb'
+    - 'net-ssh.gemspec'
+    - 'support/arcfour_check.rb'
+
 # Offense count: 14
 # Cop supports --auto-correct.
+# Configuration parameters: AllowDoxygenCommentStyle.
 Layout/LeadingCommentSpace:
   Exclude:
     - 'test/integration/test_ed25519_pkeys.rb'
@@ -109,6 +161,15 @@ Layout/SpaceInsideBlockBraces:
     - 'test/authentication/test_key_manager.rb'
     - 'test/start/test_user_nil.rb'
 
+# Offense count: 6
+# Cop supports --auto-correct.
+# Configuration parameters: EnforcedStyle, EnforcedStyleForEmptyBrackets.
+# SupportedStyles: space, no_space
+# SupportedStylesForEmptyBrackets: space, no_space
+Layout/SpaceInsideReferenceBrackets:
+  Exclude:
+    - 'lib/net/ssh/transport/algorithms.rb'
+
 # Offense count: 18
 # Cop supports --auto-correct.
 # Configuration parameters: EnforcedStyle.
@@ -118,6 +179,7 @@ Layout/TrailingBlankLines:
 
 # Offense count: 780
 # Cop supports --auto-correct.
+# Configuration parameters: AllowInHeredoc.
 Layout/TrailingWhitespace:
   Enabled: false
 
@@ -135,6 +197,7 @@ Lint/EmptyWhen:
     - 'lib/net/ssh/config.rb'
 
 # Offense count: 9
+# Configuration parameters: AllowComments.
 Lint/HandleExceptions:
   Exclude:
     - 'lib/net/ssh/authentication/session.rb'
@@ -188,10 +251,17 @@ Lint/ShadowedException:
     - 'lib/net/ssh/authentication/key_manager.rb'
 
 # Offense count: 1
+# Configuration parameters: AllowKeywordBlockArguments.
 Lint/UnderscorePrefixedVariableName:
   Exclude:
     - 'lib/net/ssh/test/local_packet.rb'
 
+# Offense count: 1
+# Cop supports --auto-correct.
+Lint/UnneededRequireStatement:
+  Exclude:
+    - 'lib/net/ssh/ruby_compat.rb'
+
 # Offense count: 60
 # Cop supports --auto-correct.
 # Configuration parameters: IgnoreEmptyBlocks, AllowUnusedKeywordArguments.
@@ -230,12 +300,13 @@ Lint/UselessAssignment:
     - 'test/integration/common.rb'
     - 'test/integration/test_forward.rb'
 
-# Offense count: 227
+# Offense count: 224
 Metrics/AbcSize:
-  Max: 74
+  Max: 69
 
-# Offense count: 16
+# Offense count: 15
 # Configuration parameters: CountComments, ExcludedMethods.
+# ExcludedMethods: refine
 Metrics/BlockLength:
   Max: 63
 
@@ -254,7 +325,7 @@ Metrics/CyclomaticComplexity:
   Max: 30
 
 # Offense count: 208
-# Configuration parameters: CountComments.
+# Configuration parameters: CountComments, ExcludedMethods.
 Metrics/MethodLength:
   Max: 88
 
@@ -314,7 +385,7 @@ Naming/ConstantName:
 
 # Offense count: 11
 # Configuration parameters: Blacklist.
-# Blacklist: END, (?-mix:EO[A-Z]{1})
+# Blacklist: (?-mix:(^|\s)(EO[A-Z]{1}|END)(\s|$))
 Naming/HeredocDelimiterNaming:
   Exclude:
     - 'test/authentication/test_agent.rb'
@@ -325,6 +396,8 @@ Naming/HeredocDelimiterNaming:
     - 'test/test_key_factory.rb'
 
 # Offense count: 4
+# Configuration parameters: EnforcedStyleForLeadingUnderscores.
+# SupportedStylesForLeadingUnderscores: disallowed, required, optional
 Naming/MemoizedInstanceVariableName:
   Exclude:
     - 'lib/net/ssh/transport/openssl.rb'
@@ -343,9 +416,18 @@ Naming/MethodName:
     - 'test/test_config.rb'
     - 'test/test_key_factory.rb'
 
+# Offense count: 4
+# Cop supports --auto-correct.
+# Configuration parameters: PreferredName.
+Naming/RescuedExceptionsVariableName:
+  Exclude:
+    - 'lib/net/ssh/connection/session.rb'
+    - 'lib/net/ssh/service/forward.rb'
+    - 'lib/net/ssh/verifiers/accept_new.rb'
+
 # Offense count: 23
 # Configuration parameters: MinNameLength, AllowNamesEndingInNumbers, AllowedNames, ForbiddenNames.
-# AllowedNames: io, id, to
+# AllowedNames: io, id, to, by, on, in, at, ip, db
 Naming/UncommunicativeMethodParamName:
   Exclude:
     - 'lib/net/ssh/authentication/certificate.rb'
@@ -361,25 +443,14 @@ Naming/UncommunicativeMethodParamName:
     - 'lib/net/ssh/transport/identity_cipher.rb'
     - 'test/connection/test_session.rb'
 
-# Offense count: 3
-# Cop supports --auto-correct.
-Performance/RangeInclude:
-  Exclude:
-    - 'lib/net/ssh/transport/algorithms.rb'
-
-# Offense count: 3
-# Cop supports --auto-correct.
-Performance/RedundantBlockCall:
-  Exclude:
-    - 'lib/net/ssh/connection/session.rb'
-    - 'test/connection/test_channel.rb'
-
-# Offense count: 6
-# Cop supports --auto-correct.
-Performance/RedundantMatch:
+# Offense count: 8
+# Configuration parameters: EnforcedStyle.
+# SupportedStyles: inline, group
+Style/AccessModifierDeclarations:
   Exclude:
-    - 'lib/net/ssh/key_factory.rb'
-    - 'lib/net/ssh/transport/server_version.rb'
+    - 'lib/net/ssh/authentication/pageant.rb'
+    - 'lib/net/ssh/transport/openssl.rb'
+    - 'test/test_key_factory.rb'
 
 # Offense count: 2
 # Cop supports --auto-correct.
@@ -420,8 +491,8 @@ Style/AsciiComments:
 
 # Offense count: 11
 # Cop supports --auto-correct.
-# Configuration parameters: EnforcedStyle, ProceduralMethods, FunctionalMethods, IgnoredMethods.
-# SupportedStyles: line_count_based, semantic, braces_for_chaining
+# Configuration parameters: EnforcedStyle, ProceduralMethods, FunctionalMethods, IgnoredMethods, AllowBracesOnProceduralOneLiners.
+# SupportedStyles: line_count_based, semantic, braces_for_chaining, always_braces
 # ProceduralMethods: benchmark, bm, bmbm, create, each_with_object, measure, new, realtime, tap, with_object
 # FunctionalMethods: let, let!, subject, watch
 # IgnoredMethods: lambda, proc, it
@@ -573,12 +644,20 @@ Style/FormatStringToken:
   Exclude:
     - 'lib/net/ssh/loggable.rb'
 
+# Offense count: 161
+# Cop supports --auto-correct.
+# Configuration parameters: EnforcedStyle.
+# SupportedStyles: always, never
+Style/FrozenStringLiteralComment:
+  Enabled: false
+
 # Offense count: 35
 # Configuration parameters: MinBodyLength.
 Style/GuardClause:
   Enabled: false
 
 # Offense count: 1
+# Configuration parameters: AllowIfModifier.
 Style/IfInsideElse:
   Exclude:
     - 'lib/net/ssh/connection/session.rb'
@@ -614,6 +693,7 @@ Style/LineEndConcatenation:
 
 # Offense count: 12
 # Cop supports --auto-correct.
+# Configuration parameters: IgnoredMethods.
 Style/MethodCallWithoutArgsParentheses:
   Exclude:
     - 'test/authentication/test_key_manager.rb'
@@ -631,7 +711,12 @@ Style/MethodDefParentheses:
     - 'test/integration/common.rb'
 
 # Offense count: 1
-Style/MethodMissing:
+Style/MethodMissingSuper:
+  Exclude:
+    - 'lib/net/ssh/connection/session.rb'
+
+# Offense count: 1
+Style/MissingRespondToMissing:
   Exclude:
     - 'lib/net/ssh/connection/session.rb'
 
@@ -642,14 +727,26 @@ Style/MultilineIfThen:
     - 'lib/net/ssh/buffered_io.rb'
     - 'lib/net/ssh/service/forward.rb'
 
-# Offense count: 3
+# Offense count: 6
+# Cop supports --auto-correct.
+Style/MultilineWhenThen:
+  Exclude:
+    - 'lib/net/ssh/test/packet.rb'
+    - 'lib/net/ssh/transport/packet_stream.rb'
+    - 'lib/net/ssh/transport/session.rb'
+
+# Offense count: 5
 Style/MultipleComparison:
   Exclude:
+    - 'lib/net/ssh/authentication/agent.rb'
     - 'lib/net/ssh/authentication/pageant.rb'
     - 'lib/net/ssh/known_hosts.rb'
+    - 'lib/net/ssh/verifiers/accept_new_or_local_tunnel.rb'
 
-# Offense count: 44
+# Offense count: 45
 # Cop supports --auto-correct.
+# Configuration parameters: EnforcedStyle.
+# SupportedStyles: literals, strict
 Style/MutableConstant:
   Enabled: false
 
@@ -685,6 +782,8 @@ Style/Next:
 
 # Offense count: 2
 # Cop supports --auto-correct.
+# Configuration parameters: EnforcedStyle.
+# SupportedStyles: predicate, comparison
 Style/NilComparison:
   Exclude:
     - 'lib/net/ssh/proxy/command.rb'
@@ -702,20 +801,12 @@ Style/Not:
 Style/NumericLiterals:
   MinDigits: 310
 
-# Offense count: 10
+# Offense count: 29
 # Cop supports --auto-correct.
-# Configuration parameters: AutoCorrect, EnforcedStyle.
+# Configuration parameters: AutoCorrect, EnforcedStyle, IgnoredMethods.
 # SupportedStyles: predicate, comparison
 Style/NumericPredicate:
-  Exclude:
-    - 'spec/**/*'
-    - 'lib/net/ssh/authentication/methods/password.rb'
-    - 'lib/net/ssh/authentication/pageant.rb'
-    - 'lib/net/ssh/buffer.rb'
-    - 'lib/net/ssh/service/forward.rb'
-    - 'lib/net/ssh/test/extensions.rb'
-    - 'lib/net/ssh/transport/key_expander.rb'
-    - 'test/transport/test_packet_stream.rb'
+  Enabled: false
 
 # Offense count: 15
 # Cop supports --auto-correct.
@@ -733,7 +824,7 @@ Style/ParallelAssignment:
 
 # Offense count: 5
 # Cop supports --auto-correct.
-# Configuration parameters: AllowSafeAssignment.
+# Configuration parameters: AllowSafeAssignment, AllowInMultilineConditions.
 Style/ParenthesesAroundCondition:
   Exclude:
     - 'lib/net/ssh/authentication/ed25519.rb'
@@ -818,6 +909,25 @@ Style/RescueModifier:
     - 'lib/net/ssh/service/forward.rb'
     - 'lib/net/ssh/transport/algorithms.rb'
 
+# Offense count: 25
+# Cop supports --auto-correct.
+# Configuration parameters: ConvertCodeThatCanStartToReturnNil, Whitelist.
+# Whitelist: present?, blank?, presence, try, try!
+Style/SafeNavigation:
+  Exclude:
+    - 'lib/net/ssh/authentication/key_manager.rb'
+    - 'lib/net/ssh/authentication/methods/keyboard_interactive.rb'
+    - 'lib/net/ssh/authentication/methods/password.rb'
+    - 'lib/net/ssh/authentication/session.rb'
+    - 'lib/net/ssh/connection/channel.rb'
+    - 'lib/net/ssh/connection/event_loop.rb'
+    - 'lib/net/ssh/connection/session.rb'
+    - 'lib/net/ssh/key_factory.rb'
+    - 'lib/net/ssh/loggable.rb'
+    - 'lib/net/ssh/test/local_packet.rb'
+    - 'lib/net/ssh/transport/algorithms.rb'
+    - 'lib/net/ssh/transport/packet_stream.rb'
+
 # Offense count: 2
 # Cop supports --auto-correct.
 Style/SelfAssignment:
@@ -863,7 +973,7 @@ Style/SpecialGlobalVars:
     - 'test/manual/test_pageant.rb'
     - 'test/test_all.rb'
 
-# Offense count: 1947
+# Offense count: 1946
 # Cop supports --auto-correct.
 # Configuration parameters: EnforcedStyle, ConsistentQuotesInMultiline.
 # SupportedStyles: single_quotes, double_quotes
@@ -895,6 +1005,12 @@ Style/UnlessElse:
     - 'test/transport/kex/test_ecdh_sha2_nistp521.rb'
     - 'test/transport/test_server_version.rb'
 
+# Offense count: 1
+# Cop supports --auto-correct.
+Style/UnneededCondition:
+  Exclude:
+    - 'lib/net/ssh/proxy/command.rb'
+
 # Offense count: 4
 # Cop supports --auto-correct.
 Style/UnneededInterpolation:
@@ -933,7 +1049,8 @@ Style/ZeroLengthPredicate:
     - 'lib/net/ssh/connection/channel.rb'
 
 # Offense count: 1633
-# Configuration parameters: AllowHeredoc, AllowURI, URISchemes, IgnoreCopDirectives, IgnoredPatterns.
+# Cop supports --auto-correct.
+# Configuration parameters: AutoCorrect, AllowHeredoc, AllowURI, URISchemes, IgnoreCopDirectives, IgnoredPatterns.
 # URISchemes: http, https
 Metrics/LineLength:
   Max: 932
diff --git a/.travis.yml b/.travis.yml
index c82edc9..c18dd23 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -7,12 +7,11 @@ addon:
     gateway.netssh
 
 rvm:
-  - 2.2.10
   - 2.3.7
   - 2.4.5
   - 2.5.3
-  - 2.6.0-rc2
-  - jruby-9.2.5.0
+  - 2.6.2
+  - jruby-9.2.8.0
   - rbx-3.107
   - ruby-head
 env:
@@ -21,33 +20,33 @@ env:
 matrix:
   exclude:
     - rvm: rbx-3.107
-    - rvm: jruby-9.2.5.0
+    - rvm: jruby-9.2.8.0
   include:
     - rvm: rbx-3.107
       env: NET_SSH_RUN_INTEGRATION_TESTS=
-    - rvm: jruby-9.2.5.0
+    - rvm: jruby-9.2.8.0
       env: JRUBY_OPTS='--client -J-XX:+TieredCompilation -J-XX:TieredStopAtLevel=1 -Xcext.enabled=false -J-Xss2m -Xcompile.invokedynamic=false' NET_SSH_RUN_INTEGRATION_TESTS=
   fast_finish: true
   allow_failures:
     - rvm: rbx-3.107
-    - rvm: jruby-9.2.5.0
+    - rvm: jruby-9.2.8.0
     - rvm: ruby-head
 
 install:
   - export JRUBY_OPTS='--client -J-XX:+TieredCompilation -J-XX:TieredStopAtLevel=1 -Xcext.enabled=false -J-Xss2m -Xcompile.invokedynamic=false'
   - sudo pip install ansible urllib3 pyOpenSSL ndg-httpsclient pyasn1
-  - gem install bundler -v "= 1.16"
+  - gem install bundler -v "= 1.17"
   - gem list bundler
-  - bundle _1.16_ install
-  - bundle _1.16_ -v
-  - BUNDLE_GEMFILE=./Gemfile.noed25519 bundle _1.16_ install
+  - bundle _1.17_ install
+  - bundle _1.17_ -v
+  - BUNDLE_GEMFILE=./Gemfile.noed25519 bundle _1.17_ install
   - sudo ansible-galaxy install rvm.ruby
   - sudo chown -R travis:travis /home/travis/.ansible
   - ansible-playbook ./test/integration/playbook.yml -i "localhost," --become -c local -e 'no_rvm=true' -e 'myuser=travis' -e 'mygroup=travis' -e 'homedir=/home/travis'
 
 script:
   - ssh -V
-  - bundle _1.16_ exec rake test
-  - BUNDLE_GEMFILE=./Gemfile.noed25519 bundle _1.16_ exec rake test
-  - bundle _1.16_ exec rake test_test
-  - bundle _1.16_ exec rubocop
+  - bundle _1.17_ exec rake test
+  - BUNDLE_GEMFILE=./Gemfile.noed25519 bundle _1.17_ exec rake test
+  - bundle _1.17_ exec rake test_test
+  - bundle _1.17_ exec rubocop
diff --git a/Gemfile.noed25519.lock b/Gemfile.noed25519.lock
deleted file mode 100644
index 3d15a2f..0000000
--- a/Gemfile.noed25519.lock
+++ /dev/null
@@ -1,41 +0,0 @@
-PATH
-  remote: .
-  specs:
-    net-ssh (4.2.0)
-
-GEM
-  remote: https://rubygems.org/
-  specs:
-    ast (2.3.0)
-    metaclass (0.0.4)
-    minitest (5.10.3)
-    mocha (1.3.0)
-      metaclass (~> 0.0.1)
-    parser (2.4.0.2)
-      ast (~> 2.3)
-    powerpack (0.1.1)
-    rainbow (2.2.2)
-      rake
-    rake (12.3.0)
-    rubocop (0.47.1)
-      parser (>= 2.3.3.1, < 3.0)
-      powerpack (~> 0.1)
-      rainbow (>= 1.99.1, < 3.0)
-      ruby-progressbar (~> 1.7)
-      unicode-display_width (~> 1.0, >= 1.0.1)
-    ruby-progressbar (1.9.0)
-    unicode-display_width (1.3.0)
-
-PLATFORMS
-  ruby
-
-DEPENDENCIES
-  bundler (~> 1.11)
-  minitest (~> 5.10)
-  mocha (>= 1.2.1)
-  net-ssh!
-  rake (~> 12.0)
-  rubocop (~> 0.47.0)
-
-BUNDLED WITH
-   1.14.6
diff --git a/appveyor.yml b/appveyor.yml
index 2beadc6..fd18163 100644
--- a/appveyor.yml
+++ b/appveyor.yml
@@ -5,9 +5,11 @@ skip_tags: true
 environment:
   matrix:
     - ruby_version: "jruby-9.1.2.0"
+    - ruby_version: "26-x64"
+    - ruby_version: "25-x64"
+    - ruby_version: "24-x64"
     - ruby_version: "23"
     - ruby_version: "23-x64"
-    - ruby_version: "22-x64"
 
 matrix:
   allow_failures:
@@ -29,7 +31,7 @@ install:
   - if "%ruby_version%" == "jruby-9.1.2.0" ( cinst jruby --version 9.1.2.0 -i --allow-empty-checksums )
   - if "%ruby_version%" == "jruby-9.1.2.0" ( SET "PATH=C:\jruby-9.1.2.0\bin\;%PATH%" )
   - ruby --version
-  - gem install bundler --no-document --user-install -v 1.16
+  - gem install bundler --no-document --user-install -v 1.17
   - SET BUNDLE_GEMFILE=Gemfile.noed25519
   - bundle install --retry=3
   - cinst freesshd
diff --git a/net-ssh.gemspec b/net-ssh.gemspec
index 4bd1354..684c6c0 100644
--- a/net-ssh.gemspec
+++ b/net-ssh.gemspec
@@ -16,7 +16,7 @@ Gem::Specification.new do |spec|
   spec.description   = %q{Net::SSH: a pure-Ruby implementation of the SSH2 client protocol. It allows you to write programs that invoke and interact with processes on remote servers, via SSH2.}
   spec.homepage      = "https://github.com/net-ssh/net-ssh"
   spec.license       = "MIT"
-  spec.required_ruby_version = Gem::Requirement.new(">= 2.2.6")
+  spec.required_ruby_version = Gem::Requirement.new(">= 2.3")
 
   spec.extra_rdoc_files = [
     "LICENSE.txt",
@@ -33,10 +33,10 @@ Gem::Specification.new do |spec|
     spec.add_development_dependency("ed25519", "~> 1.2")
   end
 
-  spec.add_development_dependency "bundler", ">= 1.11"
+  spec.add_development_dependency "bundler", ">= 1.17"
 
   spec.add_development_dependency "minitest", "~> 5.10"
   spec.add_development_dependency "mocha", ">= 1.2.1"
   spec.add_development_dependency "rake", "~> 12.0"
-  spec.add_development_dependency "rubocop", "~> 0.54.0"
+  spec.add_development_dependency "rubocop", "~> 0.74.0"
 end