looks like bundle update sorted it

Author: doriantaylor

spec/mixin_enumerable_spec.rb

@@ -33,10 +33,10 @@
     end
 
     context "Checking whether a specific value exists" do
-      it {is_expected.to have_subject(RDF::URI("http://rubygems.org/gems/rdf"))}
+      it {is_expected.to have_subject(RDF::URI("https://rubygems.org/gems/rdf"))}
       it {is_expected.to have_predicate(RDF.type)}
       it {is_expected.to have_object(RDF::Literal("A Ruby library for working with Resource Description Framework (RDF) data.", language: :en))}
-      it {is_expected.to have_graph(RDF::URI("http://ar.to/#self"))}
+      it {is_expected.to have_graph(RDF::URI("https://ar.to/#self"))}
     end
 
     it "Enumerating all statements" do