diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index f6a2976..396265b 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -8,7 +8,7 @@ jobs:
 
     strategy:
       matrix:
-        ruby: ['3.2', '3.1', '3.0', '2.7']
+        ruby: ['3.2', '3.1', '3.0']
         frozen_string_literal: ['yes', 'no']
 
     env:
diff --git a/rggen-duh.gemspec b/rggen-duh.gemspec
index edbe533..89ad2e2 100644
--- a/rggen-duh.gemspec
+++ b/rggen-duh.gemspec
@@ -25,7 +25,7 @@ Gem::Specification.new do |spec|
     `git ls-files lib LICENSE CODE_OF_CONDUCT.md README.md`.split($RS)
   spec.require_paths = ['lib']
 
-  spec.required_ruby_version = '>= 2.7'
+  spec.required_ruby_version = '>= 3.0'
 
   spec.add_runtime_dependency 'json_refs', '>= 0.1.4'
   spec.add_runtime_dependency 'json_schemer', '>= 2.0.0'