diff --git a/signalwire.gemspec b/signalwire.gemspec
index 5113569..6815f84 100644
--- a/signalwire.gemspec
+++ b/signalwire.gemspec
@@ -36,7 +36,7 @@ Gem::Specification.new do |spec|
   spec.add_development_dependency 'vcr', '~> 5.0'
   spec.add_development_dependency 'webmock', '~> 3.5'
 
-  spec.add_dependency 'twilio-ruby', '~> 5.0'
+  spec.add_dependency 'twilio-ruby', '>= 5', '< 7'
   spec.add_dependency 'faye-websocket', '~> 0.11'
   spec.add_dependency 'concurrent-ruby', '~> 1.1'
   spec.add_dependency 'has-guarded-handlers', '~> 1.6.3'