diff --git a/rails_api_example/Gemfile.lock b/rails_api_example/Gemfile.lock
index 42d55ab..ce28621 100644
--- a/rails_api_example/Gemfile.lock
+++ b/rails_api_example/Gemfile.lock
@@ -60,7 +60,7 @@ GEM
       coderay (~> 1.0)
       method_source (~> 0.8)
       slop (~> 3.4)
-    rack (1.5.2)
+    rack (1.5.5)
     rack-test (0.6.2)
       rack (>= 1.0)
     rails (4.1.2)