diff --git a/ruby/Gemfile.lock b/ruby/Gemfile.lock
index 36b2444e..b2342503 100644
--- a/ruby/Gemfile.lock
+++ b/ruby/Gemfile.lock
@@ -3,7 +3,7 @@ GEM
   specs:
     daemons (1.3.1)
     eventmachine (1.2.7)
-    rack (2.1.4)
+    rack (2.2.8.1)
     thin (1.7.2)
       daemons (~> 1.0, >= 1.0.9)
       eventmachine (~> 1.0, >= 1.0.4)