diff --git a/cuke-pack.gemspec b/cuke-pack.gemspec
index 4936f04..adfda8e 100644
--- a/cuke-pack.gemspec
+++ b/cuke-pack.gemspec
@@ -21,5 +21,6 @@ Gem::Specification.new do |gem|
   gem.add_dependency 'flay'
   gem.add_dependency 'hirb'
   gem.add_dependency 'sourcify'
+  gem.add_dependency 'sexp_processor', '~> 3.0'
 end