diff --git a/instapaper.gemspec b/instapaper.gemspec
index d3a785f..6c6f97b 100644
--- a/instapaper.gemspec
+++ b/instapaper.gemspec
@@ -4,7 +4,7 @@ require 'instapaper/version'
 
 Gem::Specification.new do |spec|
   spec.add_dependency 'addressable', '~> 2.3'
-  spec.add_dependency 'http', '~> 2'
+  spec.add_dependency 'http', '>= 2', '< 6'
   spec.add_dependency 'multi_json', '~> 1'
   spec.add_dependency 'simple_oauth', '~> 0.3'
   spec.add_dependency 'virtus', '~> 1'