diff --git a/Gemfile.lock b/Gemfile.lock
index dccfbc7..80e5509 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -231,7 +231,7 @@ GEM
       coderay (~> 1.1.0)
       method_source (~> 0.9.0)
     racc (1.6.1)
-    rack (2.2.3.1)
+    rack (2.2.6.4)
     rack-test (1.1.0)
       rack (>= 1.0, < 3)
     rails (5.2.4.4)