diff --git a/Gemfile.lock b/Gemfile.lock
index ec9d3ce..3d5cf5c 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -79,7 +79,7 @@ GEM
     nokogiri (1.10.4)
       mini_portile2 (~> 2.4.0)
     pg (0.21.0)
-    rack (1.6.11)
+    rack (1.6.13)
     rack-cors (1.0.3)
     rack-test (0.6.3)
       rack (>= 1.0)