diff --git a/visual_playground/Gemfile.lock b/visual_playground/Gemfile.lock
index bddbfa0..f8a8626 100644
--- a/visual_playground/Gemfile.lock
+++ b/visual_playground/Gemfile.lock
@@ -9,7 +9,7 @@ GEM
     pry (0.13.1)
       coderay (~> 1.1)
       method_source (~> 1.0)
-    rack (2.2.3)
+    rack (2.2.6.4)
     rack-protection (2.1.0)
       rack
     ruby2_keywords (0.0.2)