diff --git a/Gemfile.lock b/Gemfile.lock
index ab09278c..8557fda0 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -175,7 +175,7 @@ GEM
     psych (3.0.2)
     public_suffix (3.0.2)
     puma (3.11.4)
-    rack (2.0.5)
+    rack (2.0.8)
     rack-test (1.0.0)
       rack (>= 1.0, < 3)
     rails (5.2.0)