diff --git a/Gemfile.lock b/Gemfile.lock
index 596f38b..0086889 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -87,7 +87,7 @@ GEM
     nokogiri (1.8.2)
       mini_portile2 (~> 2.3.0)
     puma (3.11.2)
-    rack (2.0.4)
+    rack (2.0.8)
     rack-test (0.6.3)
       rack (>= 1.0)
     rails (5.0.6)