diff --git a/ringcentral_sdk.gemspec b/ringcentral_sdk.gemspec
index 9fac900..40c8bb9 100644
--- a/ringcentral_sdk.gemspec
+++ b/ringcentral_sdk.gemspec
@@ -24,7 +24,7 @@ Gem::Specification.new do |s|
     'lib/ringcentral_sdk/sdk.rb',
     'test/test_setup.rb'
   ]
-  s.required_ruby_version = '>= 1.8.7'
+  # s.required_ruby_version = '>= 1.8.7' # 1.8.7+ is tested
   s.add_dependency 'faraday', '~> 0.9', '>= 0.9'
   s.add_dependency 'faraday_middleware', '~> 0', '>= 0'
   s.add_dependency 'faraday_middleware-oauth2_refresh', '>= 0'