diff --git a/Gemfile b/Gemfile
index 1c214fc..2a00b18 100644
--- a/Gemfile
+++ b/Gemfile
@@ -7,7 +7,7 @@ end
 
 
 gem 'rails', '~> 5.1.4'
-gem 'puma', '~> 3.7'
+gem 'puma', '~> 4.3'
 gem 'sass-rails', '~> 5.0'
 gem 'uglifier', '>= 1.3.0'
 gem 'webpacker'
diff --git a/Gemfile.lock b/Gemfile.lock
index 89b4a9a..e21ab73 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -56,7 +56,6 @@ GEM
     chartkick (3.2.1)
     childprocess (1.0.1)
       rake (< 13.0)
-    choice (0.2.0)
     coderay (1.1.2)
     coffee-rails (4.2.2)
       coffee-script (>= 2.2.0)
@@ -133,7 +132,8 @@ GEM
       coderay (~> 1.1.0)
       method_source (~> 0.9.0)
     public_suffix (3.1.1)
-    puma (3.12.1)
+    puma (4.3.11)
+      nio4r (~> 2.0)
     rack (2.0.7)
     rack-proxy (0.6.5)
       rack
@@ -158,11 +158,6 @@ 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 (1.2.0)
       loofah (~> 2.2, >= 2.2.2)
     railties (5.1.7)
@@ -179,7 +174,6 @@ GEM
     responders (2.4.1)
       actionpack (>= 4.2.0, < 6.0)
       railties (>= 4.2.0, < 6.0)
-    ruby-graphviz (1.2.4)
     ruby-progressbar (1.10.1)
     ruby_dep (1.5.0)
     rubyzip (1.2.3)
@@ -256,10 +250,9 @@ DEPENDENCIES
   minitest (= 5.10.3)
   minitest-reporters (= 1.1.14)
   pg
-  puma (~> 3.7)
+  puma (~> 4.3)
   rails (~> 5.1.4)
   rails-controller-testing (= 1.0.2)
-  rails-erd
   redis (~> 3.3)
   sass-rails (~> 5.0)
   selenium-webdriver