Bump ruby requirements and matrix

Author: halfbyte

.github/workflows/run_tests.yml

@@ -22,7 +22,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        ruby-version: ['3.1', '3.2', '3.3', '3.4', 'head']
+        ruby-version: ['3.3', '3.4', '4.0', 'head']
 
     steps:
     - uses: ConorMacBride/install-package@v1

CHANGELOG.md

@@ -1,5 +1,12 @@
 # Changelog
 
+## 4.0.0 (Unreleased)
+
+Release 4.0.0 will bump ruby requirements so that it will require the oldest still supported ruby version.
+
+- [CHORE] Bump matrix to include 4.0 and remove unsupported ruby versions
+- [CHORE] Bump requirement to Ruby 3.3 as this is the last currently supported version (3.2 is eol as of 2026-04-01)
+
 ## 3.9.0
 
 - [FEATURE] Add BT-21 (Subject Code) (this has been added in 3.8.1 but I forgot to add this to the changelog) PR by @valii2334

secretariat.gemspec

@@ -24,7 +24,7 @@ Gem::Specification.new do |s|
   s.homepage    = 'https://github.com/halfbyte/ruby-secretariat'
   s.license       = 'Apache-2.0'
 
-  s.required_ruby_version = '>= 2.6.0'
+  s.required_ruby_version = '>= 3.3.0'
 
   s.add_runtime_dependency 'nokogiri', '~> 1.10'
   s.add_runtime_dependency 'bigdecimal', '~> 3.1'