diff --git a/tutorial-rails/Gemfile.lock b/tutorial-rails/Gemfile.lock
index 5089ff3..d577738 100644
--- a/tutorial-rails/Gemfile.lock
+++ b/tutorial-rails/Gemfile.lock
@@ -39,6 +39,7 @@ GEM
       ice_nine (~> 0.11.0)
       thread_safe (~> 0.3, >= 0.3.1)
     builder (3.1.4)
+    byebug (11.0.1)
     coercible (1.0.0)
       descendants_tracker (~> 0.0.1)
     coffee-rails (4.0.1)
@@ -70,6 +71,7 @@ GEM
     jquery-rails (3.1.4)
       railties (>= 3.0, < 5.0)
       thor (>= 0.14, < 2.0)
+    json (1.8.3)
     json (1.8.3-java)
     mail (2.5.4)
       mime-types (~> 1.16)
@@ -78,7 +80,7 @@ GEM
       virtus (~> 1.0)
     mime-types (1.25.1)
     minitest (4.7.5)
-    multi_json (1.12.1)
+    multi_json (1.14.1)
     polyglot (0.3.5)
     rack (1.5.5)
     rack-test (0.6.3)
@@ -111,7 +113,7 @@ GEM
     sdoc (0.4.1)
       json (~> 1.7, >= 1.7.7)
       rdoc (~> 4.0)
-    sprockets (2.12.4)
+    sprockets (2.12.5)
       hike (~> 1.2)
       multi_json (~> 1.0)
       rack (~> 1.0)
@@ -124,6 +126,7 @@ GEM
       therubyrhino_jar (>= 1.7.3)
     therubyrhino_jar (1.7.6)
     thor (0.19.1)
+    thread_safe (0.3.5)
     thread_safe (0.3.5-java)
     tilt (1.4.1)
     treetop (1.4.15)
@@ -143,6 +146,7 @@ GEM
 
 PLATFORMS
   java
+  ruby
 
 DEPENDENCIES
   activerecord-jdbc-adapter