diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index 830c72a6..b7ec0cf1 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -19,10 +19,8 @@ jobs:
           - ruby: truffleruby
           - ruby: truffleruby+graalvm
           - ruby: jruby
-          - ruby: "2.5"
-            rake_task: "rubocop test"
-          - ruby: "2.6"
           - ruby: "2.7"
+            rake_task: "rubocop test"
           - ruby: "3.0"
           - ruby: "3.1"
             coverage: "yes"
diff --git a/json-schema.gemspec b/json-schema.gemspec
index 1566124d..8fd121f6 100644
--- a/json-schema.gemspec
+++ b/json-schema.gemspec
@@ -20,7 +20,7 @@ Gem::Specification.new do |s|
   s.files = Dir['lib/**/*', 'resources/*.json']
   s.require_path = 'lib'
   s.extra_rdoc_files = ['README.md', 'LICENSE.md']
-  s.required_ruby_version = '>= 2.5'
+  s.required_ruby_version = '>= 2.7'
   s.license = 'MIT'
   s.required_rubygems_version = '>= 2.5'