Bump minimum required Ruby to 3.3

* `grape.gemspec`: `required_ruby_version = '>= 3.3'`.
* `.rubocop.yml`: `TargetRubyVersion: 3.3`.
* CI workflows: drop Ruby 3.2 from the `test` and `edge` matrices
  (and the now-empty `rails_edge` exclude entry).
* README install note and an UPGRADING entry for the contract break.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

Author: ericproulx

.github/workflows/edge.yml

@@ -6,11 +6,8 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        ruby: ['3.2', '3.3', '3.4', '4.0', ruby-head, truffleruby-head, jruby-head]
+        ruby: ['3.3', '3.4', '4.0', ruby-head, truffleruby-head, jruby-head]
         gemfile: [rails_edge, rack_edge]
-        exclude:
-          - ruby: '3.2'
-            gemfile: rails_edge
     runs-on: ubuntu-latest
     continue-on-error: true
     env:

.github/workflows/test.yml

@@ -23,7 +23,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        ruby: ['3.2', '3.3', '3.4', '4.0']
+        ruby: ['3.3', '3.4', '4.0']
         gemfile:
           - Gemfile
           - gemfiles/rack_2_2.gemfile

.rubocop.yml

@@ -1,6 +1,6 @@
 AllCops:
   NewCops: enable
-  TargetRubyVersion: 3.2
+  TargetRubyVersion: 3.3
   SuggestExtensions: false
   Exclude:
     - vendor/**/*

README.md

@@ -28,7 +28,7 @@ The maintainers of Grape are working with Tidelift to deliver commercial support
 
 ## Installation
 
-Ruby 3.2 or newer is required.
+Ruby 3.3 or newer is required.
 
 Grape is available as a gem, to install it run:
 

UPGRADING.md

@@ -3,6 +3,10 @@ Upgrading Grape
 
 ### Upgrading to >= 3.3
 
+#### Minimum required Ruby is now 3.3
+
+Grape no longer supports Ruby 3.2; 3.3 is now the minimum (`required_ruby_version = '>= 3.3'`). Upgrade your runtime to Ruby 3.3 or newer before bumping Grape.
+
 #### `Grape::Exceptions::ValidationErrors.new` keyword renamed `errors:` → `exceptions:`
 
 `Grape::Exceptions::ValidationErrors#initialize` now takes its input array under the `exceptions:` keyword instead of `errors:`. The kwarg accepts a mix of `Grape::Exceptions::Validation` and `Grape::Exceptions::ValidationArrayErrors` instances; `ValidationArrayErrors` wrappers are flattened internally via `flat_map(&:errors)`. The `errors` reader on the constructed instance (the grouped `{params => [Validation, ...]}` Hash) is unchanged.

grape.gemspec

@@ -29,5 +29,5 @@ Gem::Specification.new do |s|
 
   s.files = Dir['lib/**/*', 'CHANGELOG.md', 'CONTRIBUTING.md', 'README.md', 'grape.png', 'UPGRADING.md', 'LICENSE', 'grape.gemspec']
   s.require_paths = ['lib']
-  s.required_ruby_version = '>= 3.2'
+  s.required_ruby_version = '>= 3.3'
 end