diff --git a/ui/shift-client/Gemfile.lock b/ui/shift-client/Gemfile.lock
index 35f72d9..1b421dd 100644
--- a/ui/shift-client/Gemfile.lock
+++ b/ui/shift-client/Gemfile.lock
@@ -43,7 +43,7 @@ GEM
     netrc (0.11.0)
     nokogiri (1.6.8.1)
       mini_portile2 (~> 2.1.0)
-    rack (2.0.1)
+    rack (2.2.3)
     rack-test (0.6.3)
       rack (>= 1.0)
     rails-dom-testing (2.0.1)