diff --git a/dingtalk.gemspec b/dingtalk.gemspec
index cbc8f36..046fee5 100644
--- a/dingtalk.gemspec
+++ b/dingtalk.gemspec
@@ -27,7 +27,7 @@ Gem::Specification.new do |spec|
   spec.executables   = spec.files.grep(%r{^exe/}) { |f| File.basename(f) }
   spec.require_paths = ["lib"]
 
-  spec.add_dependency "rest-client", "~> 1.8.0"
+  spec.add_dependency "rest-client", "~> 1.7.0"
   spec.add_dependency "redis", "~> 3.2.0"
 
   spec.add_development_dependency "bundler", "~> 1.10"
--
libgit2 0.21.0