diff --git a/Gemfile.lock b/Gemfile.lock
index ff670b2..4e4698e 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -98,7 +98,7 @@ GEM
     pg (1.0.0)
     promise.rb (0.7.4)
     puma (3.11.4)
-    rack (2.0.4)
+    rack (2.0.6)
     rack-test (1.0.0)
       rack (>= 1.0, < 3)
     rails (5.2.0)