diff --git a/Gemfile.lock b/Gemfile.lock
index 8be0362..a6d8611 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -82,7 +82,7 @@ GEM
     omeka_client (0.0.4)
       recursive-open-struct (~> 0.4.3)
       rest (~> 2.6.3)
-    rack (1.6.4)
+    rack (1.6.13)
     rack-test (0.6.3)
       rack (>= 1.0)
     rails (4.2.3)