diff --git a/Gemfile.lock b/Gemfile.lock
index 3a0fab1..a9659f7 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -103,7 +103,7 @@ GEM
     pg (0.20.0)
     public_suffix (2.0.5)
     puma (3.8.2)
-    rack (2.0.3)
+    rack (2.0.8)
     rack-test (0.6.3)
       rack (>= 1.0)
     rails (5.1.1)