diff --git a/NetrunnerDb.gemspec b/NetrunnerDb.gemspec
index 5667582..c5598e3 100644
--- a/NetrunnerDb.gemspec
+++ b/NetrunnerDb.gemspec
@@ -20,7 +20,7 @@ Gem::Specification.new do |spec|
   spec.executables   = spec.files.grep(%r{^exe/}) { |f| File.basename(f) }
   spec.require_paths = ['lib']
 
-  spec.add_development_dependency 'bundler', '1.7'
+  spec.add_development_dependency 'bundler', '~> 1.7'
   spec.add_development_dependency 'rake', '~> 10.0'
   spec.add_development_dependency "minitest"
   spec.add_development_dependency "vcr"