diff --git a/aruba.gemspec b/aruba.gemspec
index f9edcf4aa..12df7c4a5 100644
--- a/aruba.gemspec
+++ b/aruba.gemspec
@@ -23,7 +23,7 @@ Gem::Specification.new do |spec|
 
   spec.add_runtime_dependency "childprocess", [">= 2.0", "< 5.0"]
   spec.add_runtime_dependency "contracts", "~> 0.16.0"
-  spec.add_runtime_dependency "cucumber", ">= 2.4"
+  spec.add_runtime_dependency "cucumber", [">= 2.4", "< 7.0"]
   spec.add_runtime_dependency "rspec-expectations", "~> 3.4"
   spec.add_runtime_dependency "thor", "~> 1.0"