diff --git a/webapp/ruby/Gemfile.lock b/webapp/ruby/Gemfile.lock
index 70ce298..da3c252 100644
--- a/webapp/ruby/Gemfile.lock
+++ b/webapp/ruby/Gemfile.lock
@@ -8,7 +8,7 @@ GEM
     mysql2 (0.4.5)
     mysql2-cs-bind (0.0.6)
       mysql2
-    rack (1.6.10)
+    rack (1.6.13)
     rack-protection (1.5.5)
       rack
     rack-test (0.6.3)