diff --git a/pact_broker.gemspec b/pact_broker.gemspec
index 8e414a18d..02bcb7222 100644
--- a/pact_broker.gemspec
+++ b/pact_broker.gemspec
@@ -79,7 +79,7 @@ Gem::Specification.new do |gem|
   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", "~> 4.11"
-  gem.add_runtime_dependency "sanitize", "6.0"
+  gem.add_runtime_dependency "sanitize", "~> 6.0"
   gem.add_runtime_dependency "wisper", "~> 2.0"
   gem.add_runtime_dependency "anyway_config", "~> 2.1"
   gem.add_runtime_dependency "request_store", "~> 1.5"