diff --git a/Gemfile.lock b/Gemfile.lock
index 02df024..ce0af9e 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -19,7 +19,7 @@ GEM
     maruku (0.6.0)
       syntax (>= 1.0.0)
     posix-spawn (0.3.6)
-    rack (1.4.1)
+    rack (2.1.4)
     rdiscount (1.6.8)
     syntax (1.0.0)