diff --git a/webapp/ruby/Gemfile.lock b/webapp/ruby/Gemfile.lock
index 6217c64a4..8a47baa0f 100644
--- a/webapp/ruby/Gemfile.lock
+++ b/webapp/ruby/Gemfile.lock
@@ -18,7 +18,7 @@ GEM
       rack (>= 3.0.0, < 4)
     rack-session (2.0.0)
       rack (>= 3.0.0)
-    rackup (2.2.0)
+    rackup (2.2.1)
       rack (>= 3)
     ruby2_keywords (0.0.5)
     sinatra (4.0.0)