diff --git a/welcome_bot.gemspec b/welcome_bot.gemspec
index 1659245..6646c51 100644
--- a/welcome_bot.gemspec
+++ b/welcome_bot.gemspec
@@ -26,7 +26,7 @@ Gem::Specification.new do |spec|
 
   spec.add_dependency "octokit", "~> 4.3"
   spec.add_dependency "faraday-http-cache"
-  spec.add_dependency "aws-sdk", "~> 2.0"
+  spec.add_dependency "aws-sdk", ">= 2", "< 4"
   spec.add_dependency "aws-record", "~> 1.0"
   spec.add_dependency "activerecord", "~> 5.0"
   spec.add_dependency "sinatra", "~> 1.0"