diff --git a/rails_app/config/environments/test.rb b/rails_app/config/environments/test.rb
index 738ec3c..f305108 100644
--- a/rails_app/config/environments/test.rb
+++ b/rails_app/config/environments/test.rb
@@ -42,4 +42,5 @@
 
   # Log to STDOUT
   config.logger   = ActiveSupport::TaggedLogging.logger(STDOUT)
+  config.log_level = "error"
 end
diff --git a/rails_app/lib/temporal_client.rb b/rails_app/lib/temporal_client.rb
index ca7afc6..0484b8c 100644
--- a/rails_app/lib/temporal_client.rb
+++ b/rails_app/lib/temporal_client.rb
@@ -7,10 +7,15 @@ def self.instance
 
     # Load config and apply defaults
     args, kwargs = Temporalio::EnvConfig::ClientConfig.load_client_connect_options
-    args[0] ||= 'localhost:7233' # Default address
     args[1] ||= 'default' # Default namespace
 
-    @instance = Temporalio::Client.connect(*args, **kwargs, logger: Rails.logger)
+    @instance = Temporalio::Client.connect(self.server_target, args[1], **kwargs, logger: Rails.logger)
+  end
+
+  def self.server_target
+    args, _kwargs = Temporalio::EnvConfig::ClientConfig.load_client_connect_options
+    server = args[0]
+    server || 'localhost:7233'
   end
 
   def self.instance=(instance)
diff --git a/rails_app/test/test_helper.rb b/rails_app/test/test_helper.rb
index 200c50d..486abc9 100644
--- a/rails_app/test/test_helper.rb
+++ b/rails_app/test/test_helper.rb
@@ -46,6 +46,16 @@ class TestCase
 
     # Setup all fixtures in test/fixtures/*.yml for all tests in alphabetical order.
     fixtures :all
+
+    parallelize(workers: :number_of_processors, threshold: 1)
+    parallelize_setup do |_worker|
+      TemporalClient.instance = Temporalio::Client.connect(
+        TemporalClient.server_target,
+        'default',
+        runtime: Temporalio::Runtime.new,
+        logger: Rails.logger
+      )
+    end
   end
 end