diff --git a/Gemfile.lock b/Gemfile.lock
index cc0eff5..01b4a4c 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -104,7 +104,7 @@ GEM
       premailer (~> 1.7, >= 1.7.9)
     public_suffix (4.0.6)
     racc (1.5.2)
-    rack (2.2.3)
+    rack (2.2.6.3)
     rack-test (1.1.0)
       rack (>= 1.0, < 3)
     rails (5.2.1)