diff --git a/.github/workflows/coverage.yml b/.github/workflows/coverage.yml
index 7194d16..f4d0b8b 100644
--- a/.github/workflows/coverage.yml
+++ b/.github/workflows/coverage.yml
@@ -15,7 +15,7 @@ jobs:
     - name: Set up Ruby
       uses: ruby/setup-ruby@473e4d8fe5dd94ee328fdfca9f8c9c7afc9dae5e
       with:
-        ruby-version: 2.7
+        ruby-version: 3.0
         bundler-cache: true # runs 'bundle install' and caches installed gems automatically
     - name: Install cc-test-reporter and prebuild notification
       run: |
diff --git a/spec/client_spec.rb b/spec/client_spec.rb
index ef8152c..bbddd0b 100644
--- a/spec/client_spec.rb
+++ b/spec/client_spec.rb
@@ -27,20 +27,42 @@ def post(*)
 
   describe '#shorten_link' do
     shared_examples 'short link created correctly' do |api_key_location|
-      it 'shorten link correctly' do
-        link = 'http://saiqulhaq.com'
-        VCR.use_cassette("shorten_link-SHORT-#{ENV['BUNDLE_GEMFILE']}-#{api_key_location}") do
-          options = { suffix_option: 'SHORT' }
-          result = subject.shorten_link(link, options)
-          expect(result[:link]).not_to eq('')
-          expect(result[:link]).not_to eq(link)
+      context 'when faraday default adapter is not defined' do
+        it 'raises error' do
+          if FirebaseDynamicLink::USE_FARADAY_2
+            Faraday.default_adapter = nil
+
+            link = 'http://saiqulhaq.com'
+            options = { suffix_option: 'SHORT' }
+            expect {
+              subject.shorten_link(link, options)
+            }.to raise_error
+          else
+            expect(true).to be_truthy
+          end
+        end
+      end
+
+      context 'when faraday default adapter is defined' do
+        before do
+          Faraday.default_adapter = :net_http if FirebaseDynamicLink::USE_FARADAY_2
         end
 
-        VCR.use_cassette("shorten_link-UNGUESSABLE-#{ENV['BUNDLE_GEMFILE']}-#{api_key_location}") do
-          options = { suffix_option: 'UNGUESSABLE', timout: 5 }
-          result = subject.shorten_link(link, options)
-          expect(result[:link]).not_to eq('')
-          expect(result[:link]).not_to eq(link)
+        it 'shorten link correctly' do
+          link = 'http://saiqulhaq.com'
+          VCR.use_cassette("shorten_link-SHORT-#{ENV['BUNDLE_GEMFILE']}-#{api_key_location}") do
+            options = { suffix_option: 'SHORT' }
+            result = subject.shorten_link(link, options)
+            expect(result[:link]).not_to eq('')
+            expect(result[:link]).not_to eq(link)
+          end
+
+          VCR.use_cassette("shorten_link-UNGUESSABLE-#{ENV['BUNDLE_GEMFILE']}-#{api_key_location}") do
+            options = { suffix_option: 'UNGUESSABLE', timout: 5 }
+            result = subject.shorten_link(link, options)
+            expect(result[:link]).not_to eq('')
+            expect(result[:link]).not_to eq(link)
+          end
         end
       end
     end
@@ -112,46 +134,68 @@ def post(*)
       }
     end
 
-    it 'shorten link correctly' do
-      VCR.use_cassette("shorten_parameters-SHORT-#{ENV['BUNDLE_GEMFILE']}") do
-        options = {
-          suffix_option: 'SHORT'
-          # dynamic_link_domain: 'foo' # optional
-        }
+    context 'when faraday default adapter is not defined' do
+      it 'raises error' do
+        if FirebaseDynamicLink::USE_FARADAY_2
+          Faraday.default_adapter = nil
 
-        expect do
-          result = subject.shorten_parameters(parameters, options)
-          expect(result[:link]).not_to eq('')
-          expect(result[:link]).not_to eq(link)
-        end.not_to raise_error
+          link = 'http://saiqulhaq.com'
+          options = { suffix_option: 'SHORT' }
+          expect {
+            subject.shorten_parameters(parameters, options)
+          }.to raise_error
+        else
+          expect(true).to be_truthy
+        end
       end
+    end
 
-      VCR.use_cassette("shorten_parameters-UNGUESSABLE-#{ENV['BUNDLE_GEMFILE']}") do
-        options = {
-          suffix_option: 'UNGUESSABLE'
-          # dynamic_link_domain: 'foo' # optional
-        }
+    context 'when faraday default adapter is defined' do
+      before do
+        Faraday.default_adapter = :net_http if FirebaseDynamicLink::USE_FARADAY_2
+      end
 
-        expect do
-          result = subject.shorten_parameters(parameters, options)
-          expect(result[:link]).not_to eq('')
-          expect(result[:link]).not_to eq(link)
-        end.not_to raise_error
+      it 'shorten link correctly' do
+        VCR.use_cassette("shorten_parameters-SHORT-#{ENV['BUNDLE_GEMFILE']}") do
+          options = {
+            suffix_option: 'SHORT'
+            # dynamic_link_domain: 'foo' # optional
+          }
+
+          expect do
+            result = subject.shorten_parameters(parameters, options)
+            expect(result[:link]).not_to eq('')
+            expect(result[:link]).not_to eq(link)
+          end.not_to raise_error
+        end
+
+        VCR.use_cassette("shorten_parameters-UNGUESSABLE-#{ENV['BUNDLE_GEMFILE']}") do
+          options = {
+            suffix_option: 'UNGUESSABLE'
+            # dynamic_link_domain: 'foo' # optional
+          }
+
+          expect do
+            result = subject.shorten_parameters(parameters, options)
+            expect(result[:link]).not_to eq('')
+            expect(result[:link]).not_to eq(link)
+          end.not_to raise_error
+        end
       end
-    end
 
-    it 'raise FirebaseDynamicLink::ConnectionError if Faraday::ConnectionFailed raised' do
-      allow_any_instance_of(described_class).to receive(:connection).and_return(connection_failed_class.new)
-      expect do
-        subject.shorten_parameters(parameters)
-      end.to raise_error(FirebaseDynamicLink::ConnectionError)
-    end
+      it 'raise FirebaseDynamicLink::ConnectionError if Faraday::ConnectionFailed raised' do
+        allow_any_instance_of(described_class).to receive(:connection).and_return(connection_failed_class.new)
+        expect do
+          subject.shorten_parameters(parameters)
+        end.to raise_error(FirebaseDynamicLink::ConnectionError)
+      end
 
-    it 'raise FirebaseDynamicLink::ConnectionError if Faraday::TimeoutError raised' do
-      allow_any_instance_of(described_class).to receive(:connection).and_return(timout_error_class.new)
-      expect do
-        subject.shorten_link(parameters)
-      end.to raise_error(FirebaseDynamicLink::ConnectionError)
+      it 'raise FirebaseDynamicLink::ConnectionError if Faraday::TimeoutError raised' do
+        allow_any_instance_of(described_class).to receive(:connection).and_return(timout_error_class.new)
+        expect do
+          subject.shorten_parameters(parameters)
+        end.to raise_error(FirebaseDynamicLink::ConnectionError)
+      end
     end
   end
 end
diff --git a/spec/spec_helper.rb b/spec/spec_helper.rb
index c19b8f7..812dbf4 100644
--- a/spec/spec_helper.rb
+++ b/spec/spec_helper.rb
@@ -51,6 +51,10 @@ module FirebaseDynamicLink
   config.expect_with :rspec do |c|
     c.syntax = :expect
   end
+
+  config.after(:each) do
+    Faraday.default_connection = nil
+  end
 end
 
 VCR.configure do |config|