[close #1811] Minimum Ruby version >= 2.5

.rubocop.yml

@@ -1,6 +1,6 @@
 AllCops:
   DisabledByDefault: true
-  TargetRubyVersion: 2.2
+  TargetRubyVersion: 2.5
   DisplayCopNames: true
   StyleGuideCopsOnly: false
   Exclude:

.travis.yml

@@ -8,8 +8,7 @@ before_install:
     r_eng="$(ruby -e 'STDOUT.write RUBY_ENGINE')";
     rv="$(ruby -e 'STDOUT.write RUBY_VERSION')";
     if [ "$r_eng" == "ruby" ]; then
-      if   [ "$rv" \< "2.3" ]; then gem update --system 2.7.9 --no-document
-      elif [ "$rv" \< "2.6" ]; then gem update --system --no-document --conservative
+      if [ "$rv" \< "2.6" ]; then gem update --system --no-document --conservative
       fi
     fi
     if [ "$TRAVIS_OS_NAME" == "osx" ]; then
@@ -25,9 +24,6 @@ script:
   - bundle exec rake
 
 rvm:
-  - 2.2.10
-  - 2.3.8
-  - 2.4.6
   - 2.5.5
   - 2.6.3
   - ruby-head
@@ -37,9 +33,6 @@ matrix:
   include:
     - rvm: ruby-head
       env: RUBYOPT="--jit"
-    - rvm: 2.4.6
-      os: osx
-      osx_image: xcode10.2
     - rvm: 2.5.5
       os: osx
       osx_image: xcode10.2

History.md

@@ -9,6 +9,7 @@
   * Add option to suppress SignalException on SIGTERM (#1690)
   * Allow mutual TLS CA to be set using `ssl_bind` DSL (#1689)
   * Reactor now uses nio4r instead of `select` (#1728)
+  * Minimum Ruby version now >= 2.5 (#1813)
 * x bugfixes
   * Do not accept new requests on shutdown (#1685, #1808)
   * Fix 3 corner cases when request body is chunked (#1508)

puma.gemspec

@@ -17,5 +17,8 @@ Gem::Specification.new do |s|
             %w[History.md LICENSE README.md]
   s.homepage = "http://puma.io"
   s.license = "BSD-3-Clause"
-  s.required_ruby_version = Gem::Requirement.new(">= 2.2")
+
+  # We will guarantee to support the last 2 major releases,
+  # and may choose to support further back as we see fit.
+  s.required_ruby_version = Gem::Requirement.new(">= 2.5")
 end