diff --git a/pact-support.gemspec b/pact-support.gemspec
index a984465..3a54208 100644
--- a/pact-support.gemspec
+++ b/pact-support.gemspec
@@ -35,4 +35,5 @@ Gem::Specification.new do |spec|
   spec.add_development_dependency "conventional-changelog", "~> 1.3"
   spec.add_development_dependency "bump", "~> 0.5"
   spec.add_development_dependency "base64", "~> 0.2"
+  spec.add_development_dependency "ostruct"
 end