diff --git a/Gemfile.lock b/Gemfile.lock
index e03823e..ff6ecc7 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -89,7 +89,7 @@ GEM
       coderay (~> 1.1.0)
       method_source (~> 0.9.0)
     psych (3.1.0)
-    rack (2.2.3)
+    rack (2.2.8.1)
     rake (13.0.1)
     rb-fsevent (0.10.3)
     rb-inotify (0.10.0)