diff --git a/Gemfile b/Gemfile
index 78eb020c..0fba35cc 100644
--- a/Gemfile
+++ b/Gemfile
@@ -23,6 +23,7 @@ if ENV['RAILS_GROUPS']&.split(',')&.include? 'assets'
 end
 
 gem 'nokogiri'
+gem 'rgl'
 
 # Turbolinks makes navigating your web application faster. Read more:
 # https://github.com/turbolinks/turbolinks
diff --git a/Gemfile.lock b/Gemfile.lock
index dffe90bf..2eab3574 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -353,6 +353,7 @@ GEM
       mini_portile2 (~> 2.6.1)
       racc (~> 1.4)
     orm_adapter (0.5.0)
+    pairing_heap (3.0.0)
     parallel (1.21.0)
     parser (3.0.2.0)
       ast (~> 2.4.1)
@@ -443,6 +444,10 @@ GEM
       actionpack (>= 5.0)
       railties (>= 5.0)
     rexml (3.2.5)
+    rgl (0.6.2)
+      pairing_heap (>= 0.3.0)
+      rexml (~> 3.2, >= 3.2.4)
+      stream (~> 0.5.3)
     rouge (3.26.1)
     rubocop (1.23.0)
       parallel (~> 1.10)
@@ -510,6 +515,7 @@ GEM
       sprockets (>= 3.0.0)
     sqlite3 (1.4.2-x86_64-linux-musl)
     stackprof (0.2.17-x86_64-linux-musl)
+    stream (0.5.5)
     sucker_punch (3.0.1)
       concurrent-ruby (~> 1.0)
     sutty-archives (2.5.4)
@@ -626,6 +632,7 @@ DEPENDENCIES
   rails_warden
   redis
   redis-rails
+  rgl
   rollups!
   rubocop-rails
   rubyzip
diff --git a/app/models/site/deploy_dependencies.rb b/app/models/site/deploy_dependencies.rb
new file mode 100644
index 00000000..472bbdf2
--- /dev/null
+++ b/app/models/site/deploy_dependencies.rb
@@ -0,0 +1,28 @@
+# frozen_string_literal: true
+
+require 'rgl/adjacent'
+require 'rgl/topsort'
+
+class Site
+  module DeployDependencies
+    extend ActiveSupport::Concern
+
+    included do
+      def deployment_graph
+        @deployment_graph ||= RGL::AdjacencyGraph.new.tap do |graph|
+          deploys.each do |deploy|
+            graph.add_vertex deploy
+          end
+
+          deploys.each do |deploy|
+            deploy.class::DEPENDENCIES.each do |dependency|
+              deploys.where(type: "Deploy#{dependency.to_s.classify}").each do |deploy_dependency|
+                graph.add_edge deploy_dependency, deploy
+              end
+            end
+          end
+        end
+      end
+    end
+  end
+end