diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 29707789..74af3bd6 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -88,7 +88,7 @@ jobs:
           TEMPORAL_CLOUD_MTLS_TEST_CLIENT_KEY: ${{ secrets.TEMPORAL_CLIENT_KEY }}
 
           # For API key tests
-          TEMPORAL_CLOUD_API_KEY_TEST_TARGET_HOST: us-west-2.aws.api.temporal.io:7233
+          TEMPORAL_CLOUD_API_KEY_TEST_TARGET_HOST: us-east-1.aws.api.temporal.io:7233
           TEMPORAL_CLOUD_API_KEY_TEST_NAMESPACE: ${{ vars.TEMPORAL_CLIENT_NAMESPACE }}
           TEMPORAL_CLOUD_API_KEY_TEST_API_KEY: ${{ secrets.TEMPORAL_CLIENT_CLOUD_API_KEY }}
 
diff --git a/temporalio/lib/temporalio/converters/payload_converter/composite.rb b/temporalio/lib/temporalio/converters/payload_converter/composite.rb
index 321af21a..35fcf087 100644
--- a/temporalio/lib/temporalio/converters/payload_converter/composite.rb
+++ b/temporalio/lib/temporalio/converters/payload_converter/composite.rb
@@ -49,12 +49,14 @@ def to_payload(value, hint: nil)
 
         # Convert payload to Ruby value based on its +encoding+ metadata on the payload.
         #
-        # @param payload [Api::Common::V1::Payload] Payload to convert.
+        # @param payload [Api::Common::V1::Payload, nil] Payload to convert.
         # @param hint [Object, nil] Hint, if any, to assist conversion.
-        # @return [Object] Converted Ruby value.
+        # @return [Object, nil] Converted Ruby value.
         # @raise [EncodingNotSet] If encoding not set on the metadata.
         # @raise [ConverterNotFound] If no converter found for the encoding.
         def from_payload(payload, hint: nil)
+          return nil unless payload
+
           encoding = payload.metadata['encoding']
           raise EncodingNotSet, 'Missing payload encoding' unless encoding
 
diff --git a/temporalio/sig/temporalio/converters/data_converter.rbs b/temporalio/sig/temporalio/converters/data_converter.rbs
index 7056142c..dd123287 100644
--- a/temporalio/sig/temporalio/converters/data_converter.rbs
+++ b/temporalio/sig/temporalio/converters/data_converter.rbs
@@ -13,14 +13,20 @@ module Temporalio
         ?payload_codec: PayloadCodec?
       ) -> void
 
-      def to_payload: (Object? value, ?hint: Object?) -> untyped
-      def to_payloads: (Array[Object?] values, ?hints: Array[Object]?) -> untyped
+      def to_payload: (Object? value, ?hint: Object?) -> Temporalio::Api::Common::V1::Payload
+      def to_payloads: (
+        Array[Object?] values,
+        ?hints: Array[Object]?
+      ) -> Temporalio::Api::Common::V1::Payloads
 
-      def from_payload: (untyped payload, ?hint: Object?) -> Object?
-      def from_payloads: (untyped payloads, ?hints: Array[Object]?) -> Array[Object?]
+      def from_payload: (Temporalio::Api::Common::V1::Payload payload, ?hint: Object?) -> Object?
+      def from_payloads: (
+        Temporalio::Api::Common::V1::Payloads payloads,
+        ?hints: Array[Object]?
+      ) -> Array[Object?]
 
       def to_failure: (Exception error) -> untyped
       def from_failure: (untyped failure) -> Exception
     end
   end
-end
\ No newline at end of file
+end
diff --git a/temporalio/sig/temporalio/converters/payload_converter.rbs b/temporalio/sig/temporalio/converters/payload_converter.rbs
index 5ac4c055..de2114cb 100644
--- a/temporalio/sig/temporalio/converters/payload_converter.rbs
+++ b/temporalio/sig/temporalio/converters/payload_converter.rbs
@@ -8,11 +8,17 @@ module Temporalio
         ?json_generate_options: Hash[Symbol, untyped]
       ) -> Composite
 
-      def to_payload: (Object? value, ?hint: Object?) -> untyped
-      def to_payloads: (Array[Object?] values, ?hints: Array[Object]?) -> untyped
+      def to_payload: (Object? value, ?hint: Object?) -> Temporalio::Api::Common::V1::Payload
+      def to_payloads: (
+        Array[Object?] values,
+        ?hints: Array[Object]?
+      ) -> Temporalio::Api::Common::V1::Payloads
 
-      def from_payload: (untyped payload, ?hint: Object?) -> Object?
-      def from_payloads: (untyped payloads, ?hints: Array[Object]?) -> Array[Object?]
+      def from_payload: (Temporalio::Api::Common::V1::Payload? payload, ?hint: Object?) -> Object?
+      def from_payloads: (
+        Temporalio::Api::Common::V1::Payloads payloads,
+        ?hints: Array[Object]?
+      ) -> Array[Object?]
     end
   end
-end
\ No newline at end of file
+end
diff --git a/temporalio/sig/temporalio/converters/payload_converter/encoding.rbs b/temporalio/sig/temporalio/converters/payload_converter/encoding.rbs
index 2bbee826..2b3de533 100644
--- a/temporalio/sig/temporalio/converters/payload_converter/encoding.rbs
+++ b/temporalio/sig/temporalio/converters/payload_converter/encoding.rbs
@@ -4,10 +4,10 @@ module Temporalio
       class Encoding
         def encoding: -> String
 
-        def to_payload: (Object? value, ?hint: Object?) -> untyped?
+        def to_payload: (Object? value, ?hint: Object?) -> Temporalio::Api::Common::V1::Payload?
 
-        def from_payload: (untyped payload, ?hint: Object?) -> Object?
+        def from_payload: (Temporalio::Api::Common::V1::Payload payload, ?hint: Object?) -> Object?
       end
     end
   end
-end
\ No newline at end of file
+end
diff --git a/temporalio/sig/temporalio/internal/worker/workflow_instance/child_workflow_handle.rbs b/temporalio/sig/temporalio/internal/worker/workflow_instance/child_workflow_handle.rbs
index b55a8ed0..cf1d144d 100644
--- a/temporalio/sig/temporalio/internal/worker/workflow_instance/child_workflow_handle.rbs
+++ b/temporalio/sig/temporalio/internal/worker/workflow_instance/child_workflow_handle.rbs
@@ -12,9 +12,11 @@ module Temporalio
             result_hint: Object?
           ) -> void
 
-          def _resolve: (untyped resolution) -> void
+          def _resolve: (
+            Temporalio::Internal::Bridge::Api::ChildWorkflow::ChildWorkflowResult resolution
+          ) -> void
         end
       end
     end
   end
-end
\ No newline at end of file
+end
diff --git a/temporalio/sig/temporalio/internal/worker/workflow_instance/outbound_implementation.rbs b/temporalio/sig/temporalio/internal/worker/workflow_instance/outbound_implementation.rbs
index e3d55140..47b01144 100644
--- a/temporalio/sig/temporalio/internal/worker/workflow_instance/outbound_implementation.rbs
+++ b/temporalio/sig/temporalio/internal/worker/workflow_instance/outbound_implementation.rbs
@@ -32,4 +32,4 @@ module Temporalio
       end
     end
   end
-end
\ No newline at end of file
+end
diff --git a/temporalio/test/converters/payload_converter_test.rb b/temporalio/test/converters/payload_converter_test.rb
index 65d12ed2..1c550222 100644
--- a/temporalio/test/converters/payload_converter_test.rb
+++ b/temporalio/test/converters/payload_converter_test.rb
@@ -78,6 +78,10 @@ def test_default_converter
       assert_equal 'temporal.api.common.v1.WorkflowExecution', payload.metadata['messageType']
     end
 
+    def test_missing_payload_decodes_to_nil
+      assert_nil Temporalio::Converters::PayloadConverter.default.from_payload(nil)
+    end
+
     def test_binary_proto
       # Make a new converter with all default converters except json proto so
       # that binary proto takes precedent
diff --git a/temporalio/test/golangworker/main.go b/temporalio/test/golangworker/main.go
index 53233ecf..6f1671ba 100644
--- a/temporalio/test/golangworker/main.go
+++ b/temporalio/test/golangworker/main.go
@@ -11,6 +11,7 @@ import (
 	"time"
 
 	"github.com/nexus-rpc/sdk-go/nexus"
+	"go.temporal.io/sdk/activity"
 	"go.temporal.io/sdk/client"
 	sdklog "go.temporal.io/sdk/log"
 	"go.temporal.io/sdk/temporal"
@@ -72,6 +73,14 @@ func NexusHandlerWorkflow(ctx workflow.Context, input NexusHandlerInput) (NexusH
 	}
 }
 
+func NoResultWorkflow(ctx workflow.Context) error {
+	return nil
+}
+
+func NoResultActivity(context.Context) error {
+	return nil
+}
+
 func main() {
 	if len(os.Args) != 4 {
 		log.Fatalf("expected endpoint, namespace, and task queue arg, found %v args", len(os.Args)-1)
@@ -97,6 +106,8 @@ func run(endpoint, namespace, taskQueue string) error {
 	w := worker.New(cl, taskQueue, worker.Options{})
 	w.RegisterWorkflowWithOptions(KitchenSinkWorkflow, workflow.RegisterOptions{Name: "kitchen_sink"})
 	w.RegisterWorkflowWithOptions(NexusHandlerWorkflow, workflow.RegisterOptions{Name: "nexus_handler"})
+	w.RegisterWorkflowWithOptions(NoResultWorkflow, workflow.RegisterOptions{Name: "no_result"})
+	w.RegisterActivityWithOptions(NoResultActivity, activity.RegisterOptions{Name: "no_result_activity"})
 
 	// Register Nexus service
 	nexusService := nexus.NewService("test-service")
diff --git a/temporalio/test/sig/workflow_utils.rbs b/temporalio/test/sig/workflow_utils.rbs
index 38a0009b..f604be79 100644
--- a/temporalio/test/sig/workflow_utils.rbs
+++ b/temporalio/test/sig/workflow_utils.rbs
@@ -54,4 +54,10 @@ module WorkflowUtils
     handle: Temporalio::Client::WorkflowHandle,
     ?message_contains: String?
   ) -> void
+
+  def assert_eventually_complete: (
+    handle: Temporalio::Client::WorkflowHandle,
+    ?timeout: Float,
+    ?interval: Float
+  ) -> untyped
 end
diff --git a/temporalio/test/worker_workflow_activity_test.rb b/temporalio/test/worker_workflow_activity_test.rb
index ff75436c..0e5e202f 100644
--- a/temporalio/test/worker_workflow_activity_test.rb
+++ b/temporalio/test/worker_workflow_activity_test.rb
@@ -57,6 +57,24 @@ def test_simple
                  execute_workflow(SimpleWorkflow, :local_string_name, activities: [SimpleActivity])
   end
 
+  class GoNoResultActivityWorkflow < Temporalio::Workflow::Definition
+    def execute(activity_task_queue)
+      Temporalio::Workflow.execute_activity(
+        'no_result_activity',
+        task_queue: activity_task_queue,
+        start_to_close_timeout: 10
+      )
+    end
+  end
+
+  def test_activity_without_result_from_go_sdk
+    env.with_kitchen_sink_worker do |activity_task_queue|
+      execute_workflow(GoNoResultActivityWorkflow, activity_task_queue) do |handle|
+        assert_nil assert_eventually_complete(handle:)
+      end
+    end
+  end
+
   class FailureActivity < Temporalio::Activity::Definition
     def execute
       raise Temporalio::Error::ApplicationError.new('Intentional error', 'detail1', 'detail2', non_retryable: true)
diff --git a/temporalio/test/worker_workflow_child_test.rb b/temporalio/test/worker_workflow_child_test.rb
index bbeabe6c..ad6cc3a3 100644
--- a/temporalio/test/worker_workflow_child_test.rb
+++ b/temporalio/test/worker_workflow_child_test.rb
@@ -277,6 +277,20 @@ def test_search_attributes
     assert_equal({ ATTR_KEY_TEXT.name => 'changed-text', ATTR_KEY_KEYWORD.name => 'some-keyword' }, results)
   end
 
+  class GoNoResultParentWorkflow < Temporalio::Workflow::Definition
+    def execute(child_task_queue)
+      Temporalio::Workflow.execute_child_workflow('no_result', task_queue: child_task_queue)
+    end
+  end
+
+  def test_child_workflow_without_result_from_go_sdk
+    env.with_kitchen_sink_worker do |child_task_queue|
+      execute_workflow(GoNoResultParentWorkflow, child_task_queue) do |handle|
+        assert_nil assert_eventually_complete(handle:)
+      end
+    end
+  end
+
   class ManyChildrenActivity < Temporalio::Activity::Definition
     def execute(name)
       "Hello #{name}"
diff --git a/temporalio/test/workflow_utils.rb b/temporalio/test/workflow_utils.rb
index 539c013d..93a53e21 100644
--- a/temporalio/test/workflow_utils.rb
+++ b/temporalio/test/workflow_utils.rb
@@ -79,4 +79,25 @@ def assert_eventually_task_fail(handle:, message_contains: nil)
       event
     end
   end
+
+  def assert_eventually_complete(handle:, timeout: 10, interval: 0.2)
+    start_time = Time.now
+    loop do
+      events = handle.fetch_history_events
+
+      task_fail_event = events.find(&:workflow_task_failed_event_attributes)
+      if task_fail_event
+        flunk(
+          'Workflow task failed instead of completing: ' \
+          "#{task_fail_event.workflow_task_failed_event_attributes.failure.message}"
+        )
+      end
+
+      return handle.result if events.any?(&:workflow_execution_completed_event_attributes)
+
+      flunk('Timed out waiting for workflow completion') if Time.now - start_time > timeout
+
+      sleep(interval)
+    end
+  end
 end