diff --git a/api/ruby/rendering-data-as-graphs/Gemfile.lock b/api/ruby/rendering-data-as-graphs/Gemfile.lock
index dc2bd195e..cad4b1dbb 100644
--- a/api/ruby/rendering-data-as-graphs/Gemfile.lock
+++ b/api/ruby/rendering-data-as-graphs/Gemfile.lock
@@ -18,7 +18,7 @@ GEM
       hashie (~> 1.2)
       multi_json (~> 1.3)
       netrc (~> 0.7.7)
-    rack (1.5.2)
+    rack (1.6.13)
     rack-protection (1.4.0)
       rack
     sinatra (1.3.5)