diff --git a/aws_security_viz.gemspec b/aws_security_viz.gemspec
index f0ca5de..478eaa8 100644
--- a/aws_security_viz.gemspec
+++ b/aws_security_viz.gemspec
@@ -30,7 +30,7 @@ Gem::Specification.new do |s|
   s.add_runtime_dependency 'graphviz', '~> 1.1', '>= 1.1.0'
   s.add_runtime_dependency 'optimist', '>= 3.0', '< 3.3'
   s.add_runtime_dependency 'organic_hash', '~> 1.0', '>= 1.0.2'
-  s.add_runtime_dependency 'rgl', '~> 0.5.3'
+  s.add_runtime_dependency 'rgl', '>= 0.5.3', '< 0.7.0'
   s.add_runtime_dependency 'webrick', '>= 1.8.1', '< 1.10.0'
   s.add_runtime_dependency 'aws-sdk-ec2', '>= 1.65', '< 1.499'