diff --git a/Gemfile.lock b/Gemfile.lock
index 916d993..1aa4632 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -107,7 +107,7 @@ GEM
     pg (0.18.4)
     pkg-config (1.1.7)
     puma (3.6.0)
-    rack (2.0.1)
+    rack (2.0.8)
     rack-test (0.6.3)
       rack (>= 1.0)
     rails (5.0.0.1)