diff --git a/.travis.yml b/.travis.yml
index 82c5199f34..e0117713ad 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -34,11 +34,11 @@ before_script:
 - bundle exec rake clean assets:precompile
 
 script:
-- bundle exec rake parallel:spec[1]
+- bundle exec rspec spec
 - bundle exec rake shfmt
 - bundle exec rake assert_clean
 - bundle exec rake shellcheck
-- bundle exec rake assert_examples[parallel]
+- bundle exec rake assert_examples
 
 after_success: bundle exec codeclimate-test-reporter
 
diff --git a/lib/travis/build/config.rb b/lib/travis/build/config.rb
index fd7eb588af..0fa0dd5d66 100644
--- a/lib/travis/build/config.rb
+++ b/lib/travis/build/config.rb
@@ -84,6 +84,7 @@ def sc_data
           'TRAVIS_BUILD_INTERNAL_RUBY_REGEX',
           '^ruby-(2\.[0-4]\.[0-9]|1\.9\.3)'
         ),
+        lang_archive_host: ENV.fetch('TRAVIS_LANGUAGE_ARCHIVE_HOST', 's3'),
         librato: {
           email: ENV.fetch(
             'TRAVIS_BUILD_LIBRATO_EMAIL', ENV.fetch('LIBRATO_EMAIL', '')
diff --git a/lib/travis/build/script.rb b/lib/travis/build/script.rb
index 1c24afa618..d9a8f8ee6c 100644
--- a/lib/travis/build/script.rb
+++ b/lib/travis/build/script.rb
@@ -183,13 +183,26 @@ def archive_url_for(bucket, version, lang = lang_name, ext = 'bz2')
           sh.raw "travis_rel=$(sw_vers -productVersion)"
           sh.raw "travis_rel_version=${travis_rel%*.*}"
         end
+        lang = 'python' if lang.start_with?('py')
         "archive_url=https://#{lang_archive_prefix(lang, bucket)}/binaries/${travis_host_os}/${travis_rel_version}/$(uname -m)/#{file_name}"
       end
 
       def lang_archive_prefix(lang, bucket)
         custom_archive = ENV["TRAVIS_BUILD_LANG_ARCHIVES_#{lang}".upcase]
+        unless custom_archive.to_s.empty?
+          return custom_archive.output_safe
+        end
 
-        custom_archive.to_s.empty? ? "s3.amazonaws.com/#{bucket}" : custom_archive.output_safe
+        case Travis::Build.config.lang_archive_host
+        when 'gcs'
+          "storage.googleapis.com/travis-ci-language-archives/#{lang}"
+        when 's3'
+          "s3.amazonaws.com/#{bucket}"
+        when 'cdn'
+          "language-archives.travis-ci.com/#{lang}"
+        else
+          "s3.amazonaws.com/#{bucket}" # explicitly state default
+        end
       end
 
       def debug_build_via_api?
diff --git a/lib/travis/build/script/shared/rvm.rb b/lib/travis/build/script/shared/rvm.rb
index 8cd38b0dc4..25db6c9c24 100644
--- a/lib/travis/build/script/shared/rvm.rb
+++ b/lib/travis/build/script/shared/rvm.rb
@@ -15,9 +15,10 @@ module RVM
         )
 
         RVM_VERSION_ALIASES = {
-          '2.3' => '2.3.7',
-          '2.4' => '2.4.4',
-          '2.5' => '2.5.1'
+          '2.3' => '2.3.8',
+          '2.4' => '2.4.5',
+          '2.5' => '2.5.4',
+          '2.6' => '2.6.2',
         }
 
         RVM_GPG_KEY_IDS = %w(
diff --git a/spec/build/script/elixir_spec.rb b/spec/build/script/elixir_spec.rb
index 23d8f2ed20..305108f2b0 100644
--- a/spec/build/script/elixir_spec.rb
+++ b/spec/build/script/elixir_spec.rb
@@ -92,4 +92,3 @@ def self.installs_required_otp_release(elixir_version, otp_release_wanted, otp_r
   installs_required_otp_release('1.0.5', '18.0', '17.4')
   installs_required_otp_release('1.0.5', 'R16B03-1', '17.4')
 end
-
diff --git a/spec/build/script/erlang_spec.rb b/spec/build/script/erlang_spec.rb
index 38fff0a362..d757c103d4 100644
--- a/spec/build/script/erlang_spec.rb
+++ b/spec/build/script/erlang_spec.rb
@@ -74,4 +74,3 @@
     it { is_expected.to eq("cache-#{CACHE_SLUG_EXTRAS}--otp-R14B04") }
   end
 end
-
diff --git a/spec/build/script/python_spec.rb b/spec/build/script/python_spec.rb
index 658ed366aa..667d3952b5 100644
--- a/spec/build/script/python_spec.rb
+++ b/spec/build/script/python_spec.rb
@@ -92,6 +92,26 @@
         expect(branch).to include_sexp [:raw, "archive_url=https://cdn.of.lots.of.python.stuff/binaries/${travis_host_os}/${travis_rel_version}/$(uname -m)/python-#{version}.tar.bz2"]
       end
     end
+
+    context 'and using gcs as language archive host' do
+      before :each do
+        @old_lang_archive_host = Travis::Build.config.lang_archive_host
+        Travis::Build.config.lang_archive_host = 'gcs'
+      end
+
+      after { Travis::Build.config.lang_archive_host = @old_lang_archive_host }
+
+      it "downloads archive" do
+        ENV['']
+        branch = sexp_find(sexp, [:then])
+        expect(branch).to include_sexp [:raw, "archive_url=https://storage.googleapis.com/travis-ci-language-archives/python/binaries/${travis_host_os}/${travis_rel_version}/$(uname -m)/python-#{version}.tar.bz2"]
+      end
+
+      it 'sets up pypy' do
+        data[:config][:python] = 'pypy-5.3.1'
+        should include_sexp [:raw, "archive_url=https://storage.googleapis.com/travis-ci-language-archives/python/binaries/${travis_host_os}/${travis_rel_version}/$(uname -m)/pypy-5.3.1.tar.bz2"]
+      end
+    end
   end
 
   it 'announces python --version' do
diff --git a/spec/build/script/ruby_spec.rb b/spec/build/script/ruby_spec.rb
index 3c3b86e496..dfd31c6ee6 100644
--- a/spec/build/script/ruby_spec.rb
+++ b/spec/build/script/ruby_spec.rb
@@ -186,7 +186,7 @@
     it 'ensures rvm alias is defined' do
       sexp = sexp_find(subject, [:if, "-z $(rvm alias list | grep ^2\\\\.3)"], [:then])
       store_example(name: 'rvm-alias')
-      expect(sexp).to include_sexp [:cmd, "rvm alias create 2.3 ruby-2.3.7", assert: true, echo: true, timing: true]
+      expect(sexp).to include_sexp [:cmd, "rvm alias create 2.3 ruby-2.3.8", assert: true, echo: true, timing: true]
     end
   end