diff --git a/Gemfile.lock b/Gemfile.lock
index 573a015..afbe68c 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -129,7 +129,7 @@ GEM
     psych (5.1.2)
       stringio
     racc (1.7.3)
-    rack (3.0.9.1)
+    rack (3.1.18)
     rack-session (2.0.0)
       rack (>= 3.0.0)
     rack-test (2.1.0)