diff --git a/ci/links_checker.rb b/ci/links_checker.rb
index 7012840d..a647f467 100644
--- a/ci/links_checker.rb
+++ b/ci/links_checker.rb
@@ -10,6 +10,7 @@ class LinksChecker < ::CI::CIJob
     def process
       check('easy')
       check('medium')
+      check('hard')
     end
 
     private
diff --git a/ci/readme_duplicates_checker.rb b/ci/readme_duplicates_checker.rb
index be64957a..04c1f75b 100644
--- a/ci/readme_duplicates_checker.rb
+++ b/ci/readme_duplicates_checker.rb
@@ -10,6 +10,7 @@ class ReadmeDuplicatesChecker < ::CI::CIJob
     def process
       check('easy')
       check('medium')
+      check('hard')
     end
 
     private
diff --git a/ci/readme_paths_checker.rb b/ci/readme_paths_checker.rb
index a75c4a1f..5680f77a 100644
--- a/ci/readme_paths_checker.rb
+++ b/ci/readme_paths_checker.rb
@@ -10,6 +10,7 @@ class ReadmePathsChecker < ::CI::CIJob
     def process
       check('easy')
       check('medium')
+      check('hard')
     end
 
     private
diff --git a/ci/tests_checker.rb b/ci/tests_checker.rb
index a9141eac..dc8fd8fc 100644
--- a/ci/tests_checker.rb
+++ b/ci/tests_checker.rb
@@ -10,6 +10,7 @@ class TestsChecker < ::CI::CIJob
     def process
       check('easy')
       check('medium')
+      check('hard')
     end
 
     private
diff --git a/leetcode-ruby.gemspec b/leetcode-ruby.gemspec
index 01cc3213..175fd741 100644
--- a/leetcode-ruby.gemspec
+++ b/leetcode-ruby.gemspec
@@ -5,7 +5,7 @@ require 'English'
 ::Gem::Specification.new do |s|
   s.required_ruby_version = '>= 3.0'
   s.name = 'leetcode-ruby'
-  s.version = '7.6.0'
+  s.version = '7.6.0.1'
   s.license = 'MIT'
   s.files = ::Dir['lib/**/*.rb'] + %w[README.md]
   s.executable = 'leetcode-ruby'