Support for Ruby 4.0 and reintroduced Ruby 3.1 CI for now

Author: crmne

.github/workflows/cicd.yml

@@ -35,9 +35,14 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        ruby-version: ['3.2', '3.3', '3.4', '4.0', 'jruby-10.0.2.0']
+        ruby-version: ['3.1', '3.2', '3.3', '3.4', '4.0', 'jruby-10.0.2.0']
         rails-version: ['rails-7.1', 'rails-7.2', 'rails-8.0', 'rails-8.1']
         exclude:
+          # Rails 8 requires Ruby 3.2+
+          - ruby-version: '3.1'
+            rails-version: 'rails-8.0'
+          - ruby-version: '3.1'
+            rails-version: 'rails-8.1'
           # JRuby only supports up to 7.1 right now
           - ruby-version: 'jruby-10.0.2.0'
             rails-version: 'rails-8.1'
@@ -90,6 +95,7 @@ jobs:
         fail_ci_if_error: false
 
     - name: Run the test suite with Faraday v1
+      if: matrix.ruby-version != '4.0'
       run: |
         FARADAY_VERSION=1.10.3 bundle install
         bundle exec appraisal ${{ matrix.rails-version }} bundle install

ruby_llm.gemspec

@@ -42,10 +42,15 @@ Gem::Specification.new do |spec|
   # Runtime dependencies
   spec.add_dependency 'base64'
   spec.add_dependency 'event_stream_parser', '~> 1'
-  spec.add_dependency 'faraday', ENV['FARADAY_VERSION'] || '>= 1.10.0'
+  if Gem::Version.new(Gem.ruby_version) >= Gem::Version.new('4.0')
+    spec.add_dependency 'faraday', '>= 2.0'
+    spec.add_dependency 'faraday-retry', '>= 2.0'
+  else
+    spec.add_dependency 'faraday', ENV['FARADAY_VERSION'] || '>= 1.10.0'
+    spec.add_dependency 'faraday-retry', '>= 1'
+  end
   spec.add_dependency 'faraday-multipart', '>= 1'
   spec.add_dependency 'faraday-net_http', '>= 1'
-  spec.add_dependency 'faraday-retry', '>= 1'
   spec.add_dependency 'marcel', '~> 1.0'
   spec.add_dependency 'ruby_llm-schema', '~> 0.2.1'
   spec.add_dependency 'zeitwerk', '~> 2'