diff --git a/Gemfile.lock b/Gemfile.lock
index d033c11..cee98a1 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -168,7 +168,7 @@ GEM
     popper_js (1.12.5)
     public_suffix (3.0.1)
     puma (3.11.0)
-    rack (2.0.3)
+    rack (2.0.8)
     rack-test (0.8.2)
       rack (>= 1.0, < 3)
     rails (5.1.4)