diff --git a/Gemfile.lock b/Gemfile.lock
index 9151e75..f80b584 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -41,7 +41,7 @@ GEM
     parslet (1.8.0)
     pst (0.0.2)
       andand
-    rack (2.0.5)
+    rack (2.2.3)
     rack-protection (2.0.3)
       rack
     rake (12.0.0)