diff --git a/Gemfile.lock b/Gemfile.lock
index 4b020b0..04e87d3 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -81,7 +81,7 @@ GEM
       racc (~> 1.4)
     pg (0.20.0)
     racc (1.6.2)
-    rack (2.2.6.4)
+    rack (2.2.8.1)
     rack-test (0.6.3)
       rack (>= 1.0)
     rails (5.0.7.2)