diff --git a/lib/qa/authorities/loc/generic_authority.rb b/lib/qa/authorities/loc/generic_authority.rb
index 654b5eb1..de31276c 100644
--- a/lib/qa/authorities/loc/generic_authority.rb
+++ b/lib/qa/authorities/loc/generic_authority.rb
@@ -26,7 +26,7 @@ def search(q)
     def build_query_url(q)
       escaped_query = ERB::Util.url_encode(q)
       authority_fragment = Loc.get_url_for_authority(subauthority) + ERB::Util.url_encode(subauthority)
-      "http://id.loc.gov/search/?q=#{escaped_query}&q=#{authority_fragment}&format=json"
+      "https://id.loc.gov/search/?q=#{escaped_query}&q=#{authority_fragment}&format=json"
     end
 
     def find(id)
@@ -34,7 +34,7 @@ def find(id)
     end
 
     def find_url(id)
-      "http://id.loc.gov/authorities/#{@subauthority}/#{id}.json"
+      "https://id.loc.gov/authorities/#{@subauthority}/#{id}.json"
     end
 
     private
diff --git a/lib/qa/authorities/loc_subauthority.rb b/lib/qa/authorities/loc_subauthority.rb
index 97e0c408..29d8c162 100644
--- a/lib/qa/authorities/loc_subauthority.rb
+++ b/lib/qa/authorities/loc_subauthority.rb
@@ -70,18 +70,18 @@ def preservation # rubocop:disable Metrics/MethodLength
   private
 
     def vocab_base_url
-      "cs%3Ahttp%3A%2F%2Fid.loc.gov%2Fvocabulary%2F"
+      "cs%3Ahttps%3A%2F%2Fid.loc.gov%2Fvocabulary%2F"
     end
 
     def authority_base_url
-      "cs%3Ahttp%3A%2F%2Fid.loc.gov%2Fauthorities%2F"
+      "cs%3Ahttps%3A%2F%2Fid.loc.gov%2Fauthorities%2F"
     end
 
     def datatype_base_url
-      "cs%3Ahttp%3A%2F%2Fid.loc.gov%2Fdatatypes%2F"
+      "cs%3Ahttps%3A%2F%2Fid.loc.gov%2Fdatatypes%2F"
     end
 
     def vocab_preservation_base_url
-      "cs%3Ahttp%3A%2F%2Fid.loc.gov%2Fvocabulary%2Fpreservation%2F"
+      "cs%3Ahttps%3A%2F%2Fid.loc.gov%2Fvocabulary%2Fpreservation%2F"
     end
 end
diff --git a/spec/controllers/terms_controller_spec.rb b/spec/controllers/terms_controller_spec.rb
index ee2a5729..a0014755 100644
--- a/spec/controllers/terms_controller_spec.rb
+++ b/spec/controllers/terms_controller_spec.rb
@@ -82,7 +82,7 @@ def search(_arg1, _arg2)
 
     context "loc" do
       before do
-        stub_request(:get, "http://id.loc.gov/search/?format=json&q=Berry&q=cs:http://id.loc.gov/authorities/names")
+        stub_request(:get, "https://id.loc.gov/search/?format=json&q=Berry&q=cs:https://id.loc.gov/authorities/names")
           .with(headers: { 'Accept' => 'application/json' })
           .to_return(body: webmock_fixture("loc-names-response.txt"), status: 200)
       end
@@ -188,7 +188,7 @@ def search(_arg1, _arg2)
   describe "#show" do
     context "with supported authorities" do
       before do
-        stub_request(:get, "http://id.loc.gov/authorities/subjects/sh85077565.json")
+        stub_request(:get, "https://id.loc.gov/authorities/subjects/sh85077565.json")
           .with(headers: { 'Accept' => 'application/json' })
           .to_return(status: 200, body: webmock_fixture("loc-names-response.txt"), headers: {})
       end
diff --git a/spec/lib/authorities/loc_spec.rb b/spec/lib/authorities/loc_spec.rb
index 646116d2..351e1f6f 100644
--- a/spec/lib/authorities/loc_spec.rb
+++ b/spec/lib/authorities/loc_spec.rb
@@ -28,14 +28,14 @@
     end
 
     context "for searching" do
-      let(:url) { 'http://id.loc.gov/search/?q=foo&q=cs%3Ahttp%3A%2F%2Fid.loc.gov%2Fauthorities%2Fsubjects&format=json' }
+      let(:url) { 'https://id.loc.gov/search/?q=foo&q=cs%3Ahttps%3A%2F%2Fid.loc.gov%2Fauthorities%2Fsubjects&format=json' }
       it "returns a url" do
         expect(authority.build_query_url("foo")).to eq(url)
       end
     end
 
     context "for returning single terms" do
-      let(:url) { "http://id.loc.gov/authorities/subjects/sh2002003586.json" }
+      let(:url) { "https://id.loc.gov/authorities/subjects/sh2002003586.json" }
       it "returns a url with an authority and id" do
         expect(authority.find_url("sh2002003586")).to eq(url)
       end
@@ -49,15 +49,15 @@
     end
 
     before do
-      stub_request(:get, "http://id.loc.gov/search/?format=json&q=cs:http://id.loc.gov/authorities/subjects")
+      stub_request(:get, "https://id.loc.gov/search/?format=json&q=cs:https://id.loc.gov/authorities/subjects")
         .with(headers: { 'Accept' => 'application/json' })
         .to_return(status: 200, body: "")
     end
 
     context "with flat params encoded" do
-      let(:url) { 'http://id.loc.gov/search/?q=foo&q=cs%3Ahttp%3A%2F%2Fid.loc.gov%2Fauthorities%2Fsubjects&format=json' }
+      let(:url) { 'https://id.loc.gov/search/?q=foo&q=cs%3Ahttps%3A%2F%2Fid.loc.gov%2Fauthorities%2Fsubjects&format=json' }
       it "returns a response" do
-        flat_params_url = "http://id.loc.gov/search/?format=json&q=foo&q=cs%3Ahttp%3A%2F%2Fid.loc.gov%2Fauthorities%2Fsubjects"
+        flat_params_url = "https://id.loc.gov/search/?format=json&q=foo&q=cs%3Ahttps%3A%2F%2Fid.loc.gov%2Fauthorities%2Fsubjects"
         expect(subject.env.url.to_s).to eq(flat_params_url)
       end
     end
@@ -66,7 +66,7 @@
   describe "#search" do
     context "any LOC authorities" do
       let :authority do
-        stub_request(:get, "http://id.loc.gov/search/?format=json&q=s&q=cs:http://id.loc.gov/vocabulary/geographicAreas")
+        stub_request(:get, "https://id.loc.gov/search/?format=json&q=s&q=cs:https://id.loc.gov/vocabulary/geographicAreas")
           .with(headers: { 'Accept' => 'application/json' })
           .to_return(body: webmock_fixture("loc-response.txt"), status: 200)
         described_class.subauthority_for("geographicAreas")
@@ -95,7 +95,7 @@
 
     context "subject terms" do
       let :results do
-        stub_request(:get, "http://id.loc.gov/search/?format=json&q=History--&q=cs:http://id.loc.gov/authorities/subjects")
+        stub_request(:get, "https://id.loc.gov/search/?format=json&q=History--&q=cs:https://id.loc.gov/authorities/subjects")
           .with(headers: { 'Accept' => 'application/json' })
           .to_return(body: webmock_fixture("loc-subjects-response.txt"), status: 200)
         described_class.subauthority_for("subjects").search("History--")
@@ -111,7 +111,7 @@
 
     context "name terms" do
       let :results do
-        stub_request(:get, "http://id.loc.gov/search/?format=json&q=Berry&q=cs:http://id.loc.gov/authorities/names")
+        stub_request(:get, "https://id.loc.gov/search/?format=json&q=Berry&q=cs:https://id.loc.gov/authorities/names")
           .with(headers: { 'Accept' => 'application/json' })
           .to_return(body: webmock_fixture("loc-names-response.txt"), status: 200)
         described_class.subauthority_for("names").search("Berry")
@@ -125,7 +125,7 @@
   describe "#find" do
     context "using a subject id" do
       let :results do
-        stub_request(:get, "http://id.loc.gov/authorities/subjects/sh2002003586.json")
+        stub_request(:get, "https://id.loc.gov/authorities/subjects/sh2002003586.json")
           .with(headers: { 'Accept' => 'application/json' })
           .to_return(status: 200, body: webmock_fixture("loc-subject-find-response.txt"), headers: {})
         described_class.subauthority_for("subjects").find("sh2002003586")