diff --git a/gcode/playground/rails/toy_app/Gemfile.lock b/gcode/playground/rails/toy_app/Gemfile.lock
index 93da6e36fb..d870053fe5 100644
--- a/gcode/playground/rails/toy_app/Gemfile.lock
+++ b/gcode/playground/rails/toy_app/Gemfile.lock
@@ -50,7 +50,7 @@ GEM
       execjs
     coffee-script-source (1.9.1.1)
     columnize (0.9.0)
-    concurrent-ruby (1.0.0)
+    concurrent-ruby (1.1.5)
     debug_inspector (0.0.2)
     erubis (2.7.0)
     execjs (2.6.0)
@@ -75,7 +75,7 @@ GEM
     multi_json (1.11.2)
     nokogiri (1.6.7.2)
       mini_portile2 (~> 2.0.0.rc2)
-    rack (1.6.4)
+    rack (1.6.12)
     rack-test (0.6.3)
       rack (>= 1.0)
     rails (4.2.5.1)
@@ -115,7 +115,7 @@ GEM
       json (~> 1.7, >= 1.7.7)
       rdoc (~> 4.0)
     spring (1.3.6)
-    sprockets (3.5.2)
+    sprockets (3.7.2)
       concurrent-ruby (~> 1.0)
       rack (> 1, < 3)
     sprockets-rails (3.0.1)