diff --git a/problems/50_MIT6_006F11_ps5/rsa/visualizer/Gemfile.lock b/problems/50_MIT6_006F11_ps5/rsa/visualizer/Gemfile.lock
index 71fa4a7..5e11737 100644
--- a/problems/50_MIT6_006F11_ps5/rsa/visualizer/Gemfile.lock
+++ b/problems/50_MIT6_006F11_ps5/rsa/visualizer/Gemfile.lock
@@ -10,7 +10,7 @@ GEM
       multi_json (~> 1.0)
     libv8 (3.3.10.2)
     multi_json (1.0.3)
-    rack (1.3.5)
+    rack (1.6.13)
     rack-protection (1.1.4)
       rack
     rake (0.9.2.2)