diff --git a/Gemfile.lock b/Gemfile.lock
index b6a4708e..a58fb000 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -381,7 +381,7 @@ GEM
     psych (3.1.0)
     public_suffix (3.1.1)
     puma (3.12.1)
-    rack (2.0.8)
+    rack (2.2.3)
     rack-openid (1.3.1)
       rack (>= 1.1.0)
       ruby-openid (>= 2.1.8)