diff --git a/rspec-parameterized-table_syntax.gemspec b/rspec-parameterized-table_syntax.gemspec
index a71bfd2..1db9aa8 100644
--- a/rspec-parameterized-table_syntax.gemspec
+++ b/rspec-parameterized-table_syntax.gemspec
@@ -33,7 +33,7 @@ I was inspired by [udzura's mock](https://gist.github.com/1881139).}
   spec.require_paths = ["lib"]
 
   spec.add_dependency "binding_of_caller"
-  spec.add_dependency "rspec-parameterized-core"
+  spec.add_dependency "rspec-parameterized-core", "< 2"
 
   spec.add_development_dependency "rake"
   spec.add_development_dependency "rspec"