diff --git a/qiniu.gemspec b/qiniu.gemspec
index d51f268..017cce8 100755
--- a/qiniu.gemspec
+++ b/qiniu.gemspec
@@ -21,8 +21,8 @@ Gem::Specification.new do |gem|
   gem.add_development_dependency "rake", ">= 0.9"
   gem.add_development_dependency "rspec", ">= 2.11"
   gem.add_development_dependency "fakeweb", "~> 1.3"
-  gem.add_runtime_dependency "json", "~> 1.7"
-  gem.add_runtime_dependency "rest-client", "~> 1.6"
+  gem.add_runtime_dependency "json", "~> 1.8"
+  gem.add_runtime_dependency "rest-client", "~> 1.7.3"
   gem.add_runtime_dependency "mime-types", "~> 2.4.3"
   gem.add_runtime_dependency "ruby-hmac", "~> 0.4"
   gem.add_runtime_dependency "jruby-openssl", "~> 0.7" if RUBY_PLATFORM == "java"
diff --git a/qiniu_for_rails3.gemspec b/qiniu_for_rails3.gemspec
index 2c1db4e..f5197fb 100755
--- a/qiniu_for_rails3.gemspec
+++ b/qiniu_for_rails3.gemspec
@@ -21,8 +21,8 @@ Gem::Specification.new do |gem|
   gem.add_development_dependency "rake", ">= 0.9"
   gem.add_development_dependency "rspec", ">= 2.11"
   gem.add_development_dependency "fakeweb", "~> 1.3"
-  gem.add_runtime_dependency "json", "~> 1.7"
-  gem.add_runtime_dependency "rest-client", "~> 1.6"
+  gem.add_runtime_dependency "json", "~> 1.8"
+  gem.add_runtime_dependency "rest-client", "~> 1.7.3"
   gem.add_runtime_dependency "mime-types", "~> 1.19"
   gem.add_runtime_dependency "ruby-hmac", "~> 0.4"
   gem.add_runtime_dependency "jruby-openssl", "~> 0.7" if RUBY_PLATFORM == "java"