diff --git a/Gemfile.lock b/Gemfile.lock
index c148d8e..b72c3b6 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -78,6 +78,7 @@ GEM
       xpath (~> 2.0)
     childprocess (0.9.0)
       ffi (~> 1.0, >= 1.0.11)
+    choice (0.2.0)
     coderay (1.1.2)
     coffee-rails (4.2.2)
       coffee-script (>= 2.2.0)
@@ -184,6 +185,11 @@ GEM
     rails-dom-testing (2.0.3)
       activesupport (>= 4.2.0)
       nokogiri (>= 1.6)
+    rails-erd (1.6.0)
+      activerecord (>= 4.2)
+      activesupport (>= 4.2)
+      choice (~> 0.2.0)
+      ruby-graphviz (~> 1.2)
     rails-html-sanitizer (1.0.4)
       loofah (~> 2.2, >= 2.2.2)
     railties (5.1.6)
@@ -207,8 +213,11 @@ GEM
     responders (2.4.0)
       actionpack (>= 4.2.0, < 5.3)
       railties (>= 4.2.0, < 5.3)
+    rexml (3.2.4)
+    ruby-graphviz (1.2.5)
+      rexml
     ruby_dep (1.5.0)
-    rubyzip (1.2.1)
+    rubyzip (1.3.0)
     sass (3.5.6)
       sass-listen (~> 4.0.0)
     sass-listen (4.0.0)
@@ -276,6 +285,7 @@ DEPENDENCIES
   pry
   puma (~> 3.7)
   rails (~> 5.1.0.rc2)
+  rails-erd
   sass-rails (~> 5.0)
   selenium-webdriver
   spring