Relax required ruby version to support Ruby 4

.ci/.exclude.yml

@@ -20,6 +20,8 @@ exclude:
 
   # rails-4.2 exclusions
   # Only test on ruby 2.4
+  - VERSION: ruby:4.0
+    FRAMEWORK: rails-4.2
   - VERSION: ruby:3.4
     FRAMEWORK: rails-4.2
   - VERSION: ruby:3.1
@@ -36,6 +38,7 @@ exclude:
     FRAMEWORK: rails-4.2
   - VERSION: elasticobservability/jruby:9.2-8-jdk
     FRAMEWORK: rails-4.2
+
   # sinatra-1.4 exclusions
   - VERSION: ruby:3.1
     FRAMEWORK: sinatra-1.4
@@ -136,3 +139,31 @@ exclude:
     FRAMEWORK: rails-5.2
   - VERSION: ruby:3.1
     FRAMEWORK: rails-5.1
+
+  # Only test Ruby 4 with Rails >= 7.0
+  - VERSION: ruby:4.0
+    FRAMEWORK: rails-6.1
+  - VERSION: ruby:4.0
+    FRAMEWORK: rails-5.2
+  - VERSION: ruby:4.0
+    FRAMEWORK: rails-5.1
+  - VERSION: ruby:4.0
+    FRAMEWORK: rails-4.2
+
+  # Only test Rails 8.1 with Ruby >= 3.4
+  - VERSION: ruby:3.1
+    FRAMEWORK: rails-8.1
+  - VERSION: ruby:2.7
+    FRAMEWORK: rails-8.1
+  - VERSION: ruby:2.6
+    FRAMEWORK: rails-8.1
+  - VERSION: ruby:2.4
+    FRAMEWORK: rails-8.1
+  - VERSION: jruby:9.2
+    FRAMEWORK: rails-8.1
+  - VERSION: elasticobservability/jruby:9.2-13-jdk
+    FRAMEWORK: rails-8.1
+  - VERSION: elasticobservability/jruby:9.2-11-jdk
+    FRAMEWORK: rails-8.1
+  - VERSION: elasticobservability/jruby:9.2-8-jdk
+    FRAMEWORK: rails-8.1

.ci/.framework.yml

@@ -1,4 +1,5 @@
 FRAMEWORK:
+  - rails-8.1
   - rails-7.2
   - rails-6.1
   - rails-5.2

.ci/.ruby.yml

@@ -1,4 +1,5 @@
 VERSION:
+  - ruby:4.0
   - ruby:3.4
   - ruby:3.1
   - ruby:2.7

docs/reference/supported-technologies.md

@@ -16,7 +16,7 @@ The Elastic APM Ruby Agent has built-in support for many frameworks and librarie
 
 ## Ruby [supported-technologies-ruby]
 
-We follow Ruby’s own maintenance policy and officially support all currently maintained versions per [Ruby Maintenance Branches](https://www.ruby-lang.org/en/downloads/branches/) < 4.0.
+We follow Ruby’s own maintenance policy and officially support all currently maintained versions per [Ruby Maintenance Branches](https://www.ruby-lang.org/en/downloads/branches/) < 5.0.
 
 
 ## Web Frameworks and Libraries [supported-technologies-web]
@@ -28,7 +28,7 @@ We test against all supported minor versions of Rails, Sinatra, and Grape.
 
 ### Ruby on Rails [supported-technologies-rails]
 
-We currently support Rails >= 4.2 <= 7.2. This follows Rails' own [Security policy](https://rubyonrails.org/security/).
+We currently support Rails >= 4.2 <= 8.1. This follows Rails' own [Security policy](https://rubyonrails.org/security/).
 
 See [Getting started with Rails](/reference/getting-started-rails.md).
 
@@ -131,4 +131,3 @@ To instrument a server, add the `ElasticAPM::GRPC::ServerInterceptor`.
 ```ruby
 GRPC::RpcServer.new(interceptors: [ElasticAPM::GRPC::ServerInterceptor.new])
 ```
-

elastic-apm.gemspec

@@ -29,7 +29,7 @@ Gem::Specification.new do |spec|
   spec.homepage = 'https://github.com/elastic/apm-agent-ruby'
   spec.metadata = { 'source_code_uri' => 'https://github.com/elastic/apm-agent-ruby' }
   spec.license  = 'Apache-2.0'
-  spec.required_ruby_version = ">= 2.3.0", "< 4.0"
+  spec.required_ruby_version = ">= 2.3.0", "< 5.0"
 
   spec.files = `git ls-files -z`.split("\x0").reject do |f|
     f.match(%r{^(test|spec|features)/})