diff --git a/Gemfile.lock b/Gemfile.lock
index 854e2b3..2994e12 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -193,7 +193,7 @@ GEM
     public_suffix (3.0.2)
     puma (3.12.4)
     puma (3.12.4-java)
-    rack (2.0.8)
+    rack (2.2.3)
     rack-test (1.1.0)
       rack (>= 1.0, < 3)
     rails (5.1.6.2)