diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 69fa599..693d307 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -11,14 +11,13 @@ permissions:
 
 jobs:
   test:
-
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        ruby-version: [ '2.6', '2.7', '3.0', '3.1', '3.4' ]
+        ruby-version: [ '3.0', '3.1', '3.4', '4.0' ]
 
     steps:
-    - uses: actions/checkout@v4
+    - uses: actions/checkout@v6
     - name: Set up Ruby
       uses: ruby/setup-ruby@v1
       with:
diff --git a/mailgun.gemspec b/mailgun.gemspec
index 319e630..93aea6d 100644
--- a/mailgun.gemspec
+++ b/mailgun.gemspec
@@ -25,20 +25,19 @@ Gem::Specification.new do |spec|
   spec.test_files    = spec.files.grep(%r{^(test|spec|features)/})
   spec.require_paths = ["lib"]
 
-  spec.required_ruby_version = '>= 2.6.10'
+  spec.required_ruby_version = '>= 3.0.0'
 
   spec.add_development_dependency 'bundler', '>= 1.16.2'
   spec.add_development_dependency 'rspec', '~> 3.13.0'
-  spec.add_development_dependency 'rspec-its', '~> 1.3.1'
-  spec.add_development_dependency 'rake', '~> 12.3.2'
+  spec.add_development_dependency 'rspec-its', '~> 2.0.0'
+  spec.add_development_dependency 'rake', '~> 13.3.1'
   spec.add_development_dependency 'webmock', '~> 3.7'
-  spec.add_development_dependency 'pry', '~> 0.15.2'
-  spec.add_development_dependency 'vcr', '~> 3.0.3'
+  spec.add_development_dependency 'pry', '~> 0.16.0'
+  spec.add_development_dependency 'vcr', '~> 6.4.0'
   spec.add_development_dependency 'simplecov', '~> 0.16.1'
   spec.add_development_dependency 'rails'
   spec.add_dependency 'mini_mime'
   spec.add_dependency 'faraday', "~> 2.1"
-  spec.add_dependency 'faraday-multipart', '~> 1.1.0'
+  spec.add_dependency 'faraday-multipart', '< 2'
   spec.add_dependency 'zeitwerk'
-
 end
diff --git a/spec/spec_helper.rb b/spec/spec_helper.rb
index 6bf53e3..8b8e9a3 100644
--- a/spec/spec_helper.rb
+++ b/spec/spec_helper.rb
@@ -1,4 +1,5 @@
 require 'simplecov'
+
 SimpleCov.start do
   add_filter "/spec/"
 end