diff --git a/Gemfile.lock b/Gemfile.lock
index ff79b62..b4f5f82 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -12,7 +12,7 @@ GEM
     parslet (1.5.0)
       blankslate (~> 2.0)
     posix-spawn (0.3.11)
-    rack (1.6.4)
+    rack (1.6.13)
     rack-protection (1.5.3)
       rack
     rack-test (0.6.3)