diff --git a/Gemfile.lock b/Gemfile.lock
index e4c63ad..e4ca005 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -24,7 +24,7 @@ GEM
       coderay (~> 1.1)
       method_source (~> 1.0)
     psych (3.3.2)
-    rack (2.2.3.1)
+    rack (3.0.4.1)
     rainbow (3.1.1)
     regexp_parser (2.5.0)
     rexml (3.2.5)