diff --git a/mongoid-autoinc.gemspec b/mongoid-autoinc.gemspec
index ba16adf..1fdbcdc 100644
--- a/mongoid-autoinc.gemspec
+++ b/mongoid-autoinc.gemspec
@@ -17,7 +17,7 @@ Gem::Specification.new do |s|
   s.test_files   = s.files.grep(%r(^(test|spec|features)/))
   s.require_path = 'lib'
 
-  s.add_dependency 'mongoid', ['>= 6.0', '< 9.0']
+  s.add_dependency 'mongoid', ['>= 6.0', '< 10.0']
 
   s.add_development_dependency 'rake'
   s.add_development_dependency 'foreman'