diff --git a/Gemfile.lock b/Gemfile.lock
index 93c1adb..d3c8569 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -126,7 +126,7 @@ GEM
     parser (3.0.2.0)
       ast (~> 2.4.1)
     racc (1.6.0)
-    rack (2.2.3)
+    rack (2.2.3.1)
     rack-test (1.1.0)
       rack (>= 1.0, < 3)
     rails (5.2.4.6)