diff --git a/mongoid-enum.gemspec b/mongoid-enum.gemspec
index 98818ba..603fa2f 100644
--- a/mongoid-enum.gemspec
+++ b/mongoid-enum.gemspec
@@ -18,7 +18,7 @@ Gem::Specification.new do |spec|
   spec.test_files    = spec.files.grep(%r{^(test|spec|features)/})
   spec.require_paths = ["lib"]
 
-  spec.add_runtime_dependency "mongoid", "~> 5.0"
+  spec.add_runtime_dependency "mongoid", "~> 8.0"
   spec.add_development_dependency "bundler", "~> 1.3"
   spec.add_development_dependency "rake"
   spec.add_development_dependency "rspec", "~> 3.1"