diff --git a/appengine/websockets/Gemfile.lock b/appengine/websockets/Gemfile.lock
index 190b420df..eec2d34f9 100644
--- a/appengine/websockets/Gemfile.lock
+++ b/appengine/websockets/Gemfile.lock
@@ -37,11 +37,14 @@ GEM
       racc (~> 1.4)
     public_suffix (5.0.3)
     racc (1.7.3)
-    rack (2.2.11)
+    rack (2.2.22)
     rack-protection (3.1.0)
       rack (~> 2.2, >= 2.2.4)
     rack-test (2.1.0)
       rack (>= 1.3)
+    rackup (1.0.1)
+      rack (< 3)
+      webrick
     regexp_parser (2.8.1)
     rspec (3.12.0)
       rspec-core (~> 3.12.0)
@@ -84,6 +87,7 @@ DEPENDENCIES
   cuprite
   faye-websocket
   rack-test
+  rackup
   rspec
   rspec_junit_formatter
   sinatra