diff --git a/Library/Homebrew/test/cask/artifact/alt_target_spec.rb b/Library/Homebrew/test/cask/artifact/alt_target_spec.rb
index e78a353e6c..7197654be0 100644
--- a/Library/Homebrew/test/cask/artifact/alt_target_spec.rb
+++ b/Library/Homebrew/test/cask/artifact/alt_target_spec.rb
@@ -31,7 +31,7 @@ describe Hbc::Artifact::App, :cask do
       let(:cask) {
         Hbc::Cask.new("subdir") do
           url "file://#{TEST_FIXTURE_DIR}/cask/caffeine.zip"
-          homepage "http://example.com/local-caffeine"
+          homepage "https://example.com/local-caffeine"
           version "1.2.3"
           sha256 "67cdb8a02803ef37fdbf7e0be205863172e41a561ca446cd84f0d7ab35a99d94"
           app "subdir/Caffeine.app", target: "AnotherName.app"
diff --git a/Library/Homebrew/test/cask/artifact/app_spec.rb b/Library/Homebrew/test/cask/artifact/app_spec.rb
index 305b3af37c..f0b27b378a 100644
--- a/Library/Homebrew/test/cask/artifact/app_spec.rb
+++ b/Library/Homebrew/test/cask/artifact/app_spec.rb
@@ -26,7 +26,7 @@ describe Hbc::Artifact::App, :cask do
       let(:cask) {
         Hbc::Cask.new("subdir") do
           url "file://#{TEST_FIXTURE_DIR}/cask/caffeine.zip"
-          homepage "http://example.com/local-caffeine"
+          homepage "https://example.com/local-caffeine"
           version "1.2.3"
           sha256 "67cdb8a02803ef37fdbf7e0be205863172e41a561ca446cd84f0d7ab35a99d94"
           app "subdir/Caffeine.app"
diff --git a/Library/Homebrew/test/cask/cli/cat_spec.rb b/Library/Homebrew/test/cask/cli/cat_spec.rb
index f24e1bb93a..086f1879dc 100644
--- a/Library/Homebrew/test/cask/cli/cat_spec.rb
+++ b/Library/Homebrew/test/cask/cli/cat_spec.rb
@@ -12,8 +12,8 @@ describe Hbc::CLI::Cat, :cask do
           version '1.2.3'
           sha256 '8c62a2b791cf5f0da6066a0a4b6e85f62949cd60975da062df44adf887f4370b'
 
-          url 'http://example.com/TestCask.dmg'
-          homepage 'http://example.com/'
+          url 'https://example.com/TestCask.dmg'
+          homepage 'https://example.com/'
 
           app 'TestCask.app'
         end
diff --git a/Library/Homebrew/test/cask/cli/home_spec.rb b/Library/Homebrew/test/cask/cli/home_spec.rb
index 8960d2acc0..eefdfbc849 100644
--- a/Library/Homebrew/test/cask/cli/home_spec.rb
+++ b/Library/Homebrew/test/cask/cli/home_spec.rb
@@ -8,13 +8,13 @@ describe Hbc::CLI::Home, :cask do
   it_behaves_like "a command that handles invalid options"
 
   it "opens the homepage for the specified Cask" do
-    expect(described_class).to receive(:open_url).with("http://example.com/local-caffeine")
+    expect(described_class).to receive(:open_url).with("https://example.com/local-caffeine")
     described_class.run("local-caffeine")
   end
 
   it "works for multiple Casks" do
-    expect(described_class).to receive(:open_url).with("http://example.com/local-caffeine")
-    expect(described_class).to receive(:open_url).with("http://example.com/local-transmission")
+    expect(described_class).to receive(:open_url).with("https://example.com/local-caffeine")
+    expect(described_class).to receive(:open_url).with("https://example.com/local-transmission")
     described_class.run("local-caffeine", "local-transmission")
   end
 
diff --git a/Library/Homebrew/test/cask/cli/info_spec.rb b/Library/Homebrew/test/cask/cli/info_spec.rb
index e2f82ec24f..3a8a5cd15f 100644
--- a/Library/Homebrew/test/cask/cli/info_spec.rb
+++ b/Library/Homebrew/test/cask/cli/info_spec.rb
@@ -10,7 +10,7 @@ describe Hbc::CLI::Info, :cask do
       described_class.run("local-caffeine")
     }.to output(<<~EOS).to_stdout
       local-caffeine: 1.2.3
-      http://example.com/local-caffeine
+      https://example.com/local-caffeine
       Not installed
       From: https://github.com/Homebrew/homebrew-cask/blob/master/Casks/local-caffeine.rb
       ==> Name
@@ -25,7 +25,7 @@ describe Hbc::CLI::Info, :cask do
       described_class.run("with-auto-updates")
     }.to output(<<~EOS).to_stdout
       with-auto-updates: 1.0 (auto_updates)
-      http://example.com/autoupdates
+      https://example.com/autoupdates
       Not installed
       From: https://github.com/Homebrew/homebrew-cask/blob/master/Casks/with-auto-updates.rb
       ==> Name
@@ -39,7 +39,7 @@ describe Hbc::CLI::Info, :cask do
     let(:expected_output) {
       <<~EOS
         local-caffeine: 1.2.3
-        http://example.com/local-caffeine
+        https://example.com/local-caffeine
         Not installed
         From: https://github.com/Homebrew/homebrew-cask/blob/master/Casks/local-caffeine.rb
         ==> Name
@@ -47,7 +47,7 @@ describe Hbc::CLI::Info, :cask do
         ==> Artifacts
         Caffeine.app (App)
         local-transmission: 2.61
-        http://example.com/local-transmission
+        https://example.com/local-transmission
         Not installed
         From: https://github.com/Homebrew/homebrew-cask/blob/master/Casks/local-transmission.rb
         ==> Name
@@ -69,7 +69,7 @@ describe Hbc::CLI::Info, :cask do
       described_class.run("with-caveats")
     }.to output(<<~EOS).to_stdout
       with-caveats: 1.2.3
-      http://example.com/local-caffeine
+      https://example.com/local-caffeine
       Not installed
       From: https://github.com/Homebrew/homebrew-cask/blob/master/Casks/with-caveats.rb
       ==> Name
@@ -95,7 +95,7 @@ describe Hbc::CLI::Info, :cask do
       described_class.run("with-conditional-caveats")
     }.to output(<<~EOS).to_stdout
       with-conditional-caveats: 1.2.3
-      http://example.com/local-caffeine
+      https://example.com/local-caffeine
       Not installed
       From: https://github.com/Homebrew/homebrew-cask/blob/master/Casks/with-conditional-caveats.rb
       ==> Name
@@ -110,7 +110,7 @@ describe Hbc::CLI::Info, :cask do
       described_class.run("with-languages")
     }.to output(<<~EOS).to_stdout
       with-languages: 1.2.3
-      http://example.com/local-caffeine
+      https://example.com/local-caffeine
       Not installed
       From: https://github.com/Homebrew/homebrew-cask/blob/master/Casks/with-languages.rb
       ==> Name
@@ -127,7 +127,7 @@ describe Hbc::CLI::Info, :cask do
       described_class.run("without-languages")
     }.to output(<<~EOS).to_stdout
       without-languages: 1.2.3
-      http://example.com/local-caffeine
+      https://example.com/local-caffeine
       Not installed
       From: https://github.com/Homebrew/homebrew-cask/blob/master/Casks/without-languages.rb
       ==> Name
diff --git a/Library/Homebrew/test/cask/cli/internal_stanza_spec.rb b/Library/Homebrew/test/cask/cli/internal_stanza_spec.rb
index 47b0fd8b33..cb6215bf60 100644
--- a/Library/Homebrew/test/cask/cli/internal_stanza_spec.rb
+++ b/Library/Homebrew/test/cask/cli/internal_stanza_spec.rb
@@ -3,7 +3,7 @@ describe Hbc::CLI::InternalStanza, :cask do
     command = described_class.new("gpg", "with-gpg")
     expect {
       command.run
-    }.to output("http://example.com/gpg-signature.asc\n").to_stdout
+    }.to output("https://example.com/gpg-signature.asc\n").to_stdout
   end
 
   it "raises an exception when stanza is unknown/unsupported" do
diff --git a/Library/Homebrew/test/cask/download_strategy_spec.rb b/Library/Homebrew/test/cask/download_strategy_spec.rb
index df04bac6de..b03211ff68 100644
--- a/Library/Homebrew/test/cask/download_strategy_spec.rb
+++ b/Library/Homebrew/test/cask/download_strategy_spec.rb
@@ -1,5 +1,5 @@
 describe "download strategies", :cask do
-  let(:url) { "http://example.com/cask.dmg" }
+  let(:url) { "https://example.com/cask.dmg" }
   let(:url_options) { {} }
   let(:cask) {
     instance_double(Hbc::Cask, token:   "some-cask",
@@ -16,7 +16,7 @@ describe "download strategies", :cask do
 
     it "properly assigns a name and uri based on the Cask" do
       expect(downloader.name).to eq("some-cask")
-      expect(downloader.url).to eq("http://example.com/cask.dmg")
+      expect(downloader.url).to eq("https://example.com/cask.dmg")
       expect(downloader.version.to_s).to eq("1.2.3.4")
     end
 
@@ -82,7 +82,7 @@ describe "download strategies", :cask do
     end
 
     context "with referer set" do
-      let(:url_options) { { referer: "http://somehost/also" } }
+      let(:url_options) { { referer: "https://somehost/also" } }
 
       it "adds curl args for referer" do
         curl_args = []
@@ -90,7 +90,7 @@ describe "download strategies", :cask do
 
         downloader.fetch
 
-        expect(curl_args.each_cons(2)).to include(["-e", "http://somehost/also"])
+        expect(curl_args.each_cons(2)).to include(["-e", "https://somehost/also"])
       end
     end
 
@@ -103,7 +103,7 @@ describe "download strategies", :cask do
     end
 
     context "with no discernible file name in it" do
-      let(:url) { "http://example.com/download" }
+      let(:url) { "https://example.com/download" }
 
       describe "#tarball_path" do
         subject { downloader.tarball_path }
@@ -113,7 +113,7 @@ describe "download strategies", :cask do
     end
 
     context "with a file name trailing the first query parameter" do
-      let(:url) { "http://example.com/download?file=cask.zip&a=1" }
+      let(:url) { "https://example.com/download?file=cask.zip&a=1" }
 
       describe "#tarball_path" do
         subject { downloader.tarball_path }
@@ -123,7 +123,7 @@ describe "download strategies", :cask do
     end
 
     context "with a file name trailing the second query parameter" do
-      let(:url) { "http://example.com/dl?a=1&file=cask.zip&b=2" }
+      let(:url) { "https://example.com/dl?a=1&file=cask.zip&b=2" }
 
       describe "#tarball_path" do
         subject { downloader.tarball_path }
diff --git a/Library/Homebrew/test/cask/dsl/appcast_spec.rb b/Library/Homebrew/test/cask/dsl/appcast_spec.rb
index ee9f17365d..cd85cdecc1 100644
--- a/Library/Homebrew/test/cask/dsl/appcast_spec.rb
+++ b/Library/Homebrew/test/cask/dsl/appcast_spec.rb
@@ -3,13 +3,13 @@ require "cmd/cask"
 describe Hbc::DSL::Appcast do
   subject { described_class.new(url, params) }
 
-  let(:url) { "http://example.com" }
+  let(:url) { "https://example.com" }
   let(:uri) { URI(url) }
   let(:params) { {} }
 
   describe "#to_s" do
     it "returns the parsed URI string" do
-      expect(subject.to_s).to eq("http://example.com")
+      expect(subject.to_s).to eq("https://example.com")
     end
   end
 
diff --git a/Library/Homebrew/test/cask/dsl_spec.rb b/Library/Homebrew/test/cask/dsl_spec.rb
index a40d4c972c..3528b432e3 100644
--- a/Library/Homebrew/test/cask/dsl_spec.rb
+++ b/Library/Homebrew/test/cask/dsl_spec.rb
@@ -4,8 +4,8 @@ describe Hbc::DSL, :cask do
 
   context "stanzas" do
     it "lets you set url, homepage, and version" do
-      expect(cask.url.to_s).to eq("http://example.com/TestCask.dmg")
-      expect(cask.homepage).to eq("http://example.com/")
+      expect(cask.url.to_s).to eq("https://example.com/TestCask.dmg")
+      expect(cask.homepage).to eq("https://example.com/")
       expect(cask.version.to_s).to eq("1.2.3")
     end
   end
@@ -65,8 +65,8 @@ describe Hbc::DSL, :cask do
 
       it "does not require a DSL version in the header" do
         expect(cask.token).to eq("no-dsl-version")
-        expect(cask.url.to_s).to eq("http://example.com/TestCask.dmg")
-        expect(cask.homepage).to eq("http://example.com/")
+        expect(cask.url.to_s).to eq("https://example.com/TestCask.dmg")
+        expect(cask.homepage).to eq("https://example.com/")
         expect(cask.version.to_s).to eq("1.2.3")
       end
     end
diff --git a/Library/Homebrew/test/dev-cmd/audit_spec.rb b/Library/Homebrew/test/dev-cmd/audit_spec.rb
index be307cb3ba..b2af3725b0 100644
--- a/Library/Homebrew/test/dev-cmd/audit_spec.rb
+++ b/Library/Homebrew/test/dev-cmd/audit_spec.rb
@@ -31,7 +31,7 @@ module Homebrew
 
     specify "simple valid Formula" do
       ft = formula_text "valid", <<~RUBY
-        url "http://www.example.com/valid-1.0.tar.gz"
+        url "https://www.example.com/valid-1.0.tar.gz"
       RUBY
 
       expect(ft).not_to have_data
@@ -80,7 +80,7 @@ module Homebrew
       it "is empty by default" do
         fa = formula_auditor "foo", <<~RUBY
           class Foo < Formula
-            url "http://example.com/foo-1.0.tgz"
+            url "https://example.com/foo-1.0.tgz"
           end
         RUBY
 
@@ -94,7 +94,7 @@ module Homebrew
 
         fa = formula_auditor "foo", <<~RUBY
           class Foo < Formula
-            url "http://example.com/foo-1.0.tgz"
+            url "https://example.com/foo-1.0.tgz"
           end
         RUBY
 
@@ -109,7 +109,7 @@ module Homebrew
       specify "DATA but no __END__" do
         fa = formula_auditor "foo", <<~RUBY
           class Foo < Formula
-            url "http://example.com/foo-1.0.tgz"
+            url "https://example.com/foo-1.0.tgz"
             patch :DATA
           end
         RUBY
@@ -121,7 +121,7 @@ module Homebrew
       specify "__END__ but no DATA" do
         fa = formula_auditor "foo", <<~RUBY
           class Foo < Formula
-            url "http://example.com/foo-1.0.tgz"
+            url "https://example.com/foo-1.0.tgz"
           end
           __END__
           a patch goes here
@@ -141,8 +141,8 @@ module Homebrew
       specify "no issue" do
         fa = formula_auditor "foo", <<~RUBY
           class Foo < Formula
-            url "http://example.com/foo-1.0.tgz"
-            homepage "http://example.com"
+            url "https://example.com/foo-1.0.tgz"
+            homepage "https://example.com"
           end
         RUBY
 
@@ -155,7 +155,7 @@ module Homebrew
       specify "pkgshare" do
         fa = formula_auditor "foo", <<~RUBY, strict: true
           class Foo < Formula
-            url "http://example.com/foo-1.0.tgz"
+            url "https://example.com/foo-1.0.tgz"
           end
         RUBY
 
@@ -188,7 +188,7 @@ module Homebrew
         fa = formula_auditor "foolibc++", <<~RUBY, strict: true
           class Foolibcxx < Formula
             desc "foolibc++ is a test"
-            url "http://example.com/foo-1.0.tgz"
+            url "https://example.com/foo-1.0.tgz"
           end
         RUBY
 
@@ -209,7 +209,7 @@ module Homebrew
         fa = formula_auditor "foo", <<~RUBY, strict: true, online: true
           class Foo < Formula
             homepage "https://github.com/example/example"
-            url "http://example.com/foo-1.0.tgz"
+            url "https://example.com/foo-1.0.tgz"
           end
         RUBY
 
@@ -226,8 +226,8 @@ module Homebrew
           let(:fa) do
             formula_auditor "foo", <<~RUBY, new_formula: true
               class Foo < Formula
-                url "http://example.com/foo-1.0.tgz"
-                homepage "http://example.com"
+                url "https://example.com/foo-1.0.tgz"
+                homepage "https://example.com"
 
                 depends_on "openssl"
               end
@@ -236,8 +236,8 @@ module Homebrew
 
           let(:f_openssl) do
             formula do
-              url "http://example.com/openssl-1.0.tgz"
-              homepage "http://example.com"
+              url "https://example.com/openssl-1.0.tgz"
+              homepage "https://example.com"
 
               keg_only :provided_by_macos
             end
@@ -258,8 +258,8 @@ module Homebrew
           let(:fa) do
             formula_auditor "foo", <<~RUBY, new_formula: true
               class Foo < Formula
-                url "http://example.com/foo-1.0.tgz"
-                homepage "http://example.com"
+                url "https://example.com/foo-1.0.tgz"
+                homepage "https://example.com"
 
                 depends_on "bc"
               end
@@ -268,8 +268,8 @@ module Homebrew
 
           let(:f_bc) do
             formula do
-              url "http://example.com/bc-1.0.tgz"
-              homepage "http://example.com"
+              url "https://example.com/bc-1.0.tgz"
+              homepage "https://example.com"
 
               keg_only :provided_by_macos
             end
@@ -290,7 +290,7 @@ module Homebrew
       specify "keg_only_needs_downcasing" do
         fa = formula_auditor "foo", <<~RUBY, strict: true
           class Foo < Formula
-            url "http://example.com/foo-1.0.tgz"
+            url "https://example.com/foo-1.0.tgz"
 
             keg_only "Because why not"
           end
@@ -304,7 +304,7 @@ module Homebrew
       specify "keg_only_redundant_period" do
         fa = formula_auditor "foo", <<~RUBY, strict: true
           class Foo < Formula
-            url "http://example.com/foo-1.0.tgz"
+            url "https://example.com/foo-1.0.tgz"
 
             keg_only "because this line ends in a period."
           end
@@ -318,7 +318,7 @@ module Homebrew
       specify "keg_only_handles_block_correctly" do
         fa = formula_auditor "foo", <<~RUBY, strict: true
           class Foo < Formula
-            url "http://example.com/foo-1.0.tgz"
+            url "https://example.com/foo-1.0.tgz"
 
             keg_only <<~EOF
               this line starts with a lowercase word.
@@ -337,7 +337,7 @@ module Homebrew
       specify "keg_only_handles_whitelist_correctly" do
         fa = formula_auditor "foo", <<~RUBY, strict: true
           class Foo < Formula
-            url "http://example.com/foo-1.0.tgz"
+            url "https://example.com/foo-1.0.tgz"
 
             keg_only "Apple ships foo in the CLT package"
           end
diff --git a/Library/Homebrew/test/os/linux/dependency_collector_spec.rb b/Library/Homebrew/test/os/linux/dependency_collector_spec.rb
index 285f8a169c..da84408a43 100644
--- a/Library/Homebrew/test/os/linux/dependency_collector_spec.rb
+++ b/Library/Homebrew/test/os/linux/dependency_collector_spec.rb
@@ -12,19 +12,19 @@ describe DependencyCollector do
 
     context "when xz, unzip, and bzip2 are not available" do
       it "creates a resource dependency from a '.xz' URL" do
-        resource.url("http://example.com/foo.xz")
+        resource.url("https://example.com/foo.xz")
         allow_any_instance_of(Object).to receive(:which).with("xz")
         expect(subject.add(resource)).to eq(Dependency.new("xz", [:build]))
       end
 
       it "creates a resource dependency from a '.zip' URL" do
-        resource.url("http://example.com/foo.zip")
+        resource.url("https://example.com/foo.zip")
         allow_any_instance_of(Object).to receive(:which).with("unzip")
         expect(subject.add(resource)).to eq(Dependency.new("unzip", [:build]))
       end
 
       it "creates a resource dependency from a '.bz2' URL" do
-        resource.url("http://example.com/foo.tar.bz2")
+        resource.url("https://example.com/foo.tar.bz2")
         allow_any_instance_of(Object).to receive(:which).with("bzip2")
         expect(subject.add(resource)).to eq(Dependency.new("bzip2", [:build]))
       end
@@ -32,19 +32,19 @@ describe DependencyCollector do
 
     context "when xz, zip, and bzip2 are available" do
       it "does not create a resource dependency from a '.xz' URL" do
-        resource.url("http://example.com/foo.xz")
+        resource.url("https://example.com/foo.xz")
         allow_any_instance_of(Object).to receive(:which).with("xz").and_return(Pathname.new("foo"))
         expect(subject.add(resource)).to be nil
       end
 
       it "does not create a resource dependency from a '.zip' URL" do
-        resource.url("http://example.com/foo.zip")
+        resource.url("https://example.com/foo.zip")
         allow_any_instance_of(Object).to receive(:which).with("unzip").and_return(Pathname.new("foo"))
         expect(subject.add(resource)).to be nil
       end
 
       it "does not create a resource dependency from a '.bz2' URL" do
-        resource.url("http://example.com/foo.tar.bz2")
+        resource.url("https://example.com/foo.tar.bz2")
         allow_any_instance_of(Object).to receive(:which).with("bzip2").and_return(Pathname.new("foo"))
         expect(subject.add(resource)).to be nil
       end
diff --git a/Library/Homebrew/test/os/mac/dependency_collector_spec.rb b/Library/Homebrew/test/os/mac/dependency_collector_spec.rb
index 41301ff78c..9bf00c3353 100644
--- a/Library/Homebrew/test/os/mac/dependency_collector_spec.rb
+++ b/Library/Homebrew/test/os/mac/dependency_collector_spec.rb
@@ -25,26 +25,26 @@ describe DependencyCollector do
   specify "Resource xz pre-Mavericks dependency" do
     allow(MacOS).to receive(:version).and_return(MacOS::Version.new("10.8"))
     resource = Resource.new
-    resource.url("http://example.com/foo.tar.xz")
+    resource.url("https://example.com/foo.tar.xz")
     expect(subject.add(resource)).to eq(Dependency.new("xz", [:build]))
   end
 
   specify "Resource xz Mavericks or newer dependency" do
     allow(MacOS).to receive(:version).and_return(MacOS::Version.new("10.9"))
     resource = Resource.new
-    resource.url("http://example.com/foo.tar.xz")
+    resource.url("https://example.com/foo.tar.xz")
     expect(subject.add(resource)).to be nil
   end
 
   specify "Resource dependency from a '.zip' URL" do
     resource = Resource.new
-    resource.url("http://example.com/foo.zip")
+    resource.url("https://example.com/foo.zip")
     expect(subject.add(resource)).to be nil
   end
 
   specify "Resource dependency from a '.bz2' URL" do
     resource = Resource.new
-    resource.url("http://example.com/foo.tar.bz2")
+    resource.url("https://example.com/foo.tar.bz2")
     expect(subject.add(resource)).to be nil
   end