diff --git a/omniauth-saml.gemspec b/omniauth-saml.gemspec
index acb2f9b..92041fb 100644
--- a/omniauth-saml.gemspec
+++ b/omniauth-saml.gemspec
@@ -14,7 +14,7 @@ Gem::Specification.new do |gem|
   gem.required_ruby_version = '>= 2.4'
 
   gem.add_runtime_dependency 'omniauth', '~> 2.0'
-  gem.add_runtime_dependency 'ruby-saml', '~> 1.9'
+  gem.add_runtime_dependency 'ruby-saml', '~> 1.12'
 
   gem.add_development_dependency 'rake', '>= 12.3.3'
   gem.add_development_dependency 'rspec', '~>3.4'