diff --git a/Gemfile.lock b/Gemfile.lock
index 3014377..c801205 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -167,7 +167,7 @@ GEM
     pg (0.21.0)
     public_suffix (3.0.1)
     puma (3.11.4)
-    rack (2.0.5)
+    rack (2.0.8)
     rack-test (0.8.2)
       rack (>= 1.0, < 3)
     rails (5.1.4)