diff --git a/Gemfile.lock b/Gemfile.lock
index d486e5d..78954c0 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -161,7 +161,7 @@ GEM
       pry (>= 0.9.11)
     psych (3.1.0)
     public_suffix (3.0.3)
-    rack (2.0.7)
+    rack (2.2.3)
     rack-test (1.1.0)
       rack (>= 1.0, < 3)
     railroady (1.5.3)