diff --git a/Gemfile.lock b/Gemfile.lock
index 52ea67e..9dd738a 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -70,7 +70,7 @@ GEM
       coderay (~> 1.0)
       method_source (~> 0.8)
       slop (~> 3.4)
-    rack (1.5.2)
+    rack (2.2.3)
     rest-client (1.6.7)
       mime-types (>= 1.16)
     safe_yaml (1.0.2)