diff --git a/devise_token_auth.gemspec b/devise_token_auth.gemspec
index 15482381e..6dd164579 100644
--- a/devise_token_auth.gemspec
+++ b/devise_token_auth.gemspec
@@ -31,5 +31,5 @@ Gem::Specification.new do |s|
   s.add_development_dependency 'pg'
   s.add_development_dependency 'mysql2'
   s.add_development_dependency 'mongoid', '>= 4', '< 8'
-  s.add_development_dependency 'mongoid-locker', '~> 2.0'
+  s.add_development_dependency 'mongoid-locker', '>= 1.0', '< 3.0'
 end