diff --git a/Gemfile b/Gemfile
index 752d2da23..6799774e8 100644
--- a/Gemfile
+++ b/Gemfile
@@ -59,13 +59,13 @@ end
 if ENV['MONGOID_VERSION']
   case ENV['MONGOID_VERSION']
   when /^7/
-    gem 'mongoid', '~> 7'
+    gem 'mongoid', '>= 4', '< 10'
   when /^6/
-    gem 'mongoid', '~> 6'
+    gem 'mongoid', '>= 4', '< 10'
   when /^5/
-    gem 'mongoid', '~> 5'
+    gem 'mongoid', '>= 4', '< 10'
   else
-    gem 'mongoid', '>= 5'
+    gem 'mongoid', '>= 4', '< 10'
   end
 
   gem 'mongoid-locker', '~> 2.0'
diff --git a/devise_token_auth.gemspec b/devise_token_auth.gemspec
index 8715a483c..ec920aedb 100644
--- a/devise_token_auth.gemspec
+++ b/devise_token_auth.gemspec
@@ -30,6 +30,6 @@ Gem::Specification.new do |s|
   s.add_development_dependency 'sqlite3', '~> 2.0'
   s.add_development_dependency 'pg'
   s.add_development_dependency 'mysql2'
-  s.add_development_dependency 'mongoid', '>= 4', '< 8'
+  s.add_development_dependency 'mongoid', '>= 4', '< 10'
   s.add_development_dependency 'mongoid-locker', '~> 2.0'
 end