diff --git a/omniauth-slack.gemspec b/omniauth-slack.gemspec
index c081491..610757b 100644
--- a/omniauth-slack.gemspec
+++ b/omniauth-slack.gemspec
@@ -16,7 +16,7 @@ Gem::Specification.new do |spec|
   spec.test_files    = spec.files.grep(%r{^(test|spec|features)/})
   spec.require_paths = ["lib"]
 
-  spec.add_runtime_dependency 'omniauth-oauth2', "~> 1.1.2"
+  spec.add_runtime_dependency 'omniauth-oauth2', "~> 1.2.0"
 
   spec.add_development_dependency "bundler", "~> 1.3"
   spec.add_development_dependency "rake"