diff --git a/bing-ads-reporting.gemspec b/bing-ads-reporting.gemspec
index 1bd19e6..f37ec5b 100644
--- a/bing-ads-reporting.gemspec
+++ b/bing-ads-reporting.gemspec
@@ -16,7 +16,7 @@ Gem::Specification.new do |gem|
   gem.test_files    = [] # gem.files.grep(%r{^(test|spec|features)/})
   gem.require_paths = ['lib']
 
-  gem.add_dependency 'httparty', '~> 0.17.0'
+  gem.add_dependency 'httparty', '>= 0.17', '< 0.19'
   gem.add_dependency 'datebox',  '~> 0.5.0'
   gem.add_dependency 'oauth2',   '~> 1.4.1'
   gem.add_dependency 'savon',    '~> 2.12.0'