diff --git a/api/ruby/rendering-data-as-graphs/Gemfile.lock b/api/ruby/rendering-data-as-graphs/Gemfile.lock
index 7908feed4..253755797 100644
--- a/api/ruby/rendering-data-as-graphs/Gemfile.lock
+++ b/api/ruby/rendering-data-as-graphs/Gemfile.lock
@@ -18,7 +18,7 @@ GEM
     octokit (4.7.0)
       sawyer (~> 0.8.0, >= 0.5.3)
     public_suffix (3.0.0)
-    rack (1.6.8)
+    rack (1.6.13)
     rack-protection (1.5.3)
       rack
     sawyer (0.8.1)