diff --git a/Gemfile b/Gemfile
index 92a44656..93c91f25 100644
--- a/Gemfile
+++ b/Gemfile
@@ -18,7 +18,7 @@ gem 'request_store'
 gem 'rest-client'
 gem 'rsolr'
 gem 'thin', '~> 1.0' # compatibility version pin. thin should be replaced with webmoc
-
+gem "down", "~> 5.0"
 
 # Testing
 group :test do
diff --git a/Gemfile.lock b/Gemfile.lock
index a9b77aa7..5727a79e 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -1,6 +1,6 @@
 GIT
   remote: https://github.com/ncbo/goo.git
-  revision: 26c0a69e67ac59778a46caf51202ebd38ccac767
+  revision: 5cac44e06a6bf0c093563dad66240ab07fec4d9c
   branch: master
   specs:
     goo (0.0.2)
@@ -63,18 +63,20 @@ GEM
       logger (~> 1.5)
     coderay (1.1.3)
     concurrent-ruby (1.3.5)
-    connection_pool (2.5.3)
+    connection_pool (2.5.4)
     cube-ruby (0.0.3)
     daemons (1.4.1)
     date (3.4.1)
     docile (1.4.1)
     domain_name (0.6.20240107)
+    down (5.4.2)
+      addressable (~> 2.8)
     email_spec (2.3.0)
       htmlentities (~> 4.3.3)
       launchy (>= 2.1, < 4.0)
       mail (~> 2.7)
     eventmachine (1.2.7)
-    faraday (2.13.4)
+    faraday (2.14.0)
       faraday-net_http (>= 2.0, < 3.5)
       json
       logger
@@ -86,11 +88,11 @@ GEM
     hashie (5.0.0)
     htmlentities (4.3.4)
     http-accept (1.7.0)
-    http-cookie (1.0.8)
+    http-cookie (1.1.0)
       domain_name (~> 0.5)
     i18n (0.9.5)
       concurrent-ruby (~> 1.0)
-    json (2.13.2)
+    json (2.15.2)
     json_pure (2.8.1)
     language_server-protocol (3.17.0.5)
     launchy (3.1.1)
@@ -111,7 +113,7 @@ GEM
     mime-types (3.7.0)
       logger
       mime-types-data (~> 3.2025, >= 3.2025.0507)
-    mime-types-data (3.2025.0819)
+    mime-types-data (3.2025.0924)
     mini_mime (1.1.5)
     minitest (4.7.5)
     minitest-reporters (0.14.24)
@@ -160,7 +162,7 @@ GEM
       method_source (~> 1.0)
     public_suffix (5.1.1)
     racc (1.8.1)
-    rack (2.2.17)
+    rack (2.2.20)
     rack-test (0.8.3)
       rack (>= 1.0, < 3)
     rainbow (3.1.1)
@@ -169,7 +171,7 @@ GEM
       addressable (>= 2.2)
     redis (5.4.1)
       redis-client (>= 0.22.0)
-    redis-client (0.25.2)
+    redis-client (0.26.1)
       connection_pool
     regexp_parser (2.11.2)
     request_store (1.7.0)
@@ -199,7 +201,7 @@ GEM
       prism (~> 1.4)
     ruby-progressbar (1.13.0)
     ruby2_keywords (0.0.5)
-    rubyzip (3.0.1)
+    rubyzip (3.0.2)
     simplecov (0.22.0)
       docile (~> 1.1)
       simplecov-html (~> 0.11)
@@ -222,7 +224,7 @@ GEM
     unicode-display_width (3.1.5)
       unicode-emoji (~> 4.0, >= 4.0.4)
     unicode-emoji (4.0.4)
-    uri (1.0.3)
+    uri (1.0.4)
     uuid (2.3.9)
       macaddr (~> 1.0)
 
@@ -238,6 +240,7 @@ DEPENDENCIES
   addressable (~> 2.8)
   bcrypt (~> 3.0)
   cube-ruby
+  down (~> 5.0)
   email_spec
   ffi
   goo!
diff --git a/lib/ontologies_linked_data/models/ontology_submission.rb b/lib/ontologies_linked_data/models/ontology_submission.rb
index 2687470f..83810a2a 100644
--- a/lib/ontologies_linked_data/models/ontology_submission.rb
+++ b/lib/ontologies_linked_data/models/ontology_submission.rb
@@ -3,7 +3,7 @@
 require 'uri'
 require 'open-uri'
 require 'cgi'
-require 'benchmark'
+# require 'benchmark'
 require 'csv'
 require 'fileutils'
 
@@ -59,12 +59,8 @@ class OntologySubmission < LinkedData::Models::Base
       # Description metadata
       attribute :description, namespace: :omv, enforce: %i[concatenate], fuzzy_search: true
 
-      # attribute :homepage
-      # attribute :documentation, namespace: :omv
-      # attribute :publication
-      # attribute :uri, namespace: :omv
-      attribute :homepage, namespace: :foaf, type: :uri
-      attribute :documentation, namespace: :omv, type: :uri
+      attribute :homepage, namespace: :foaf, type: :url
+      attribute :documentation, namespace: :omv, type: :url
       attribute :publication, type: %i[uri list]
       attribute :uri, namespace: :omv, type: :uri, enforce: %i[distinct_of_identifier], fuzzy_search: true
 
@@ -124,7 +120,7 @@ class OntologySubmission < LinkedData::Models::Base
       attribute :wasInvalidatedBy, namespace: :prov, type: :list
 
       # Links
-      attribute :pullLocation, type: :uri # URI for pulling ontology
+      attribute :pullLocation, type: :url # URL for pulling ontology
       attribute :isFormatOf, namespace: :dct, type: :uri
       attribute :hasFormat, namespace: :dct, type: %i[uri list]
       attribute :dataDump, namespace: :void, type: :uri, default: -> (s) { data_dump_default(s) }
diff --git a/lib/ontologies_linked_data/models/project.rb b/lib/ontologies_linked_data/models/project.rb
index 9faea774..a32a8265 100644
--- a/lib/ontologies_linked_data/models/project.rb
+++ b/lib/ontologies_linked_data/models/project.rb
@@ -7,7 +7,7 @@ class Project < LinkedData::Models::Base
       attribute :created, enforce: [:date_time], :default => lambda {|x| DateTime.now }
       attribute :updated, enforce: [:date_time], :default => lambda {|x| DateTime.now }
       attribute :name, enforce: [:existence, :safe_text_256]
-      attribute :homePage, enforce: [:uri, :existence]
+      attribute :homePage, enforce: [:url, :existence]
       attribute :description, enforce: [:existence, :safe_text]
       attribute :contacts, enforce: [:safe_text_256]
       attribute :institution, enforce: [:safe_text_256]