diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index c82f2b6..2f8a618 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -10,7 +10,7 @@ jobs:
   test:
     strategy:
       matrix:
-        ruby: ["2.6", "2.7", "3.0", "3.1", "3.2", "3.3"]
+        ruby: ["2.7", "3.0", "3.1", "3.2", "3.3"]
         gemfile:
           - gemfiles/jekyll_3.9.gemfile
           - gemfiles/jekyll_4.0.gemfile
diff --git a/.rubocop.yml b/.rubocop.yml
index ab07b89..74606ef 100644
--- a/.rubocop.yml
+++ b/.rubocop.yml
@@ -1,5 +1,5 @@
 AllCops:
-  TargetRubyVersion: 2.6
+  TargetRubyVersion: 2.7
   NewCops: enable
   Exclude:
     - "*.gemspec"
diff --git a/jekyll-toc.gemspec b/jekyll-toc.gemspec
index 0540ccb..e7e0c04 100644
--- a/jekyll-toc.gemspec
+++ b/jekyll-toc.gemspec
@@ -26,7 +26,7 @@ Gem::Specification.new do |spec|
     end
   end
 
-  spec.required_ruby_version = '>= 2.6'
+  spec.required_ruby_version = '>= 2.7'
 
   spec.add_dependency 'jekyll', '>= 3.9'
   spec.add_dependency 'nokogiri', '~> 1.12'