diff --git a/Gemfile.lock b/Gemfile.lock
index 41a0071..301d64c 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -94,7 +94,7 @@ GEM
     parser (3.2.1.1)
       ast (~> 2.4.1)
     racc (1.8.1)
-    rack (2.2.13)
+    rack (2.2.18)
     rack-test (2.0.2)
       rack (>= 1.3)
     rails (5.2.8.1)