diff --git a/devise-kerberos-authenticatable.gemspec b/devise-kerberos-authenticatable.gemspec
index d58f6ad..c49a7dc 100644
--- a/devise-kerberos-authenticatable.gemspec
+++ b/devise-kerberos-authenticatable.gemspec
@@ -14,5 +14,5 @@ Gem::Specification.new do |s|
   s.homepage        = 'http://www.github.com/atomaka/devise-kerberos-authenticatable'
 
   s.add_dependency  'timfel-krb5-auth', '~> 0.8'
-  s.add_dependency  'devise', '~> 3.1.1'
+  s.add_dependency  'devise', '~> 3.5.1'
 end