diff --git a/Gemfile.lock b/Gemfile.lock
index 6075a88..735ccfb 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -76,7 +76,7 @@ GEM
       open4 (>= 0.4.0)
     posix-spawn (0.3.6)
     progressbar (0.12.0)
-    rack (1.4.4)
+    rack (3.0.9.1)
     rake (10.0.3)
     rspec (2.12.0)
       rspec-core (~> 2.12.0)