diff --git a/pact_broker.gemspec b/pact_broker.gemspec
index aa1c8cd70..c056eec5f 100644
--- a/pact_broker.gemspec
+++ b/pact_broker.gemspec
@@ -60,6 +60,7 @@ Gem::Specification.new do |gem|
   gem.add_runtime_dependency 'sucker_punch', '~>2.0'
   gem.add_runtime_dependency 'rack-protection', '~>2.0'
   gem.add_runtime_dependency 'dry-types', '~> 0.10.3' # https://travis-ci.org/pact-foundation/pact_broker/jobs/249448621
+  gem.add_runtime_dependency 'dry-logic', '0.4.2' # Later version cases ArgumentError: wrong number of arguments
   gem.add_runtime_dependency 'table_print', '~> 1.5'
   gem.add_runtime_dependency 'semantic_logger', '~> 4.3'