gridium.gemspec in gridium-0.1.17 vs gridium.gemspec in gridium-0.1.18

@@ -29,9 +29,8 @@
 
   spec.add_development_dependency "bundler", "~> 1.10"
   spec.add_development_dependency "rake", "~> 10.0"
   spec.add_development_dependency "rspec", "~> 3.0"
 
-  spec.add_runtime_dependency "selenium-webdriver", "~> 2.50.0"
+  spec.add_runtime_dependency "selenium-webdriver", ">= 2.50.0", "< 3"
   spec.add_runtime_dependency "oily_png", "~> 1.2"
-
 end