diff --git a/Gemfile.lock b/Gemfile.lock
index cd57352..0ebf57e 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -11,7 +11,7 @@ GEM
   specs:
     mocha (0.9.8)
       rake
-    rack (2.2.3)
+    rack (3.0.4.1)
     rake (12.3.3)
     useragent (0.16.10)