diff --git a/Gemfile.lock b/Gemfile.lock
index 4636936..8768712 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -102,7 +102,7 @@ GEM
     orm_adapter (0.5.0)
     pg (0.19.0)
     public_suffix (2.0.5)
-    rack (2.2.3)
+    rack (2.2.3.1)
     rack-test (0.6.3)
       rack (>= 1.0)
     rails (5.0.1)