diff --git a/.github/workflows/ruby.yml b/.github/workflows/ruby.yml
index 2e07041..f064a21 100644
--- a/.github/workflows/ruby.yml
+++ b/.github/workflows/ruby.yml
@@ -13,7 +13,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        ruby-version: [ 3.1, 3.0, 2.7 ]
+        ruby-version: [ 3, 3.1, "3.0" ]
 
     name: Ruby ${{ matrix.ruby-version }}
 
diff --git a/rspec-uuid.gemspec b/rspec-uuid.gemspec
index 948ed88..2e09c00 100644
--- a/rspec-uuid.gemspec
+++ b/rspec-uuid.gemspec
@@ -12,6 +12,8 @@ Gem::Specification.new do |s|
   s.summary     = package.to_s
   s.version     = package.const_get "VERSION"
 
+  s.required_ruby_version = ">= 3"
+
   s.add_dependency "rspec-expectations", ">= 3"
 
   s.add_development_dependency "activesupport"