diff --git a/Gemfile.lock b/Gemfile.lock
index 82fd788..8676eda 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -218,7 +218,7 @@ GEM
       byebug (~> 3.4)
       pry (~> 0.10)
     puma (3.0.2)
-    rack (1.6.11)
+    rack (1.6.13)
     rack-openid (1.3.1)
       rack (>= 1.1.0)
       ruby-openid (>= 2.1.8)