diff --git a/librarian.gemspec b/librarian.gemspec
index 86f40b83..529fae00 100644
--- a/librarian.gemspec
+++ b/librarian.gemspec
@@ -21,7 +21,7 @@ Gem::Specification.new do |gem|
   gem.add_dependency "highline"
 
   gem.add_development_dependency "rake"
-  gem.add_development_dependency "rspec"
+  gem.add_development_dependency "rspec", "~> 2.99"
   gem.add_development_dependency "json"
   gem.add_development_dependency "fakefs", "~> 0.4.2"
 end