diff --git a/README.md b/README.md
index 5ca5a0f..4b7e0d0 100644
--- a/README.md
+++ b/README.md
@@ -138,6 +138,8 @@ The following samples demonstrate much of the basic functionality and capabiliti
 
 - **[Signal](https://github.com/temporalio/samples-php/tree/master/app/src/Signal)**: Example of sending and handling a Signal
 
+- **[Update](https://github.com/temporalio/samples-php/tree/master/app/src/Updates)**: Example of Workflow Update feature
+
 - **[Saga](https://github.com/temporalio/samples-php/tree/master/app/src/Saga)**: Example of SAGA pattern support
 
 - **[SearchAttributes](https://github.com/temporalio/samples-php/tree/master/app/src/SearchAttributes)**: Example of Custom search attributes that can be used to find Workflows using predicates
diff --git a/app/composer.json b/app/composer.json
index 7d820c7..f7710d0 100644
--- a/app/composer.json
+++ b/app/composer.json
@@ -6,7 +6,8 @@
     "spiral/tokenizer": "^3.7",
     "temporal/open-telemetry-interceptors": "dev-master",
     "open-telemetry/exporter-otlp": "^0.0.17",
-    "open-telemetry/transport-grpc": "^0.0.17"
+    "open-telemetry/transport-grpc": "^0.0.17",
+    "symfony/console": "^5.4 || ^6.0 || ^7.0"
   },
   "require-dev": {
     "buggregator/trap": "^1.3"
diff --git a/app/src/ActivityRetry/ExecuteCommand.php b/app/src/ActivityRetry/ExecuteCommand.php
index 98b4133..7701c04 100644
--- a/app/src/ActivityRetry/ExecuteCommand.php
+++ b/app/src/ActivityRetry/ExecuteCommand.php
@@ -22,7 +22,7 @@ class ExecuteCommand extends Command
     protected const NAME = 'activity-retry';
     protected const DESCRIPTION = 'Execute ActivityRetry\GreetingWorkflow';
 
-    public function execute(InputInterface $input, OutputInterface $output)
+    public function execute(InputInterface $input, OutputInterface $output): int
     {
         $workflow = $this->workflowClient->newWorkflowStub(
             GreetingWorkflowInterface::class,
diff --git a/app/src/AsyncActivity/ExecuteCommand.php b/app/src/AsyncActivity/ExecuteCommand.php
index 2fbed5c..e1f18ca 100644
--- a/app/src/AsyncActivity/ExecuteCommand.php
+++ b/app/src/AsyncActivity/ExecuteCommand.php
@@ -22,7 +22,7 @@ class ExecuteCommand extends Command
     protected const NAME = 'async-activity';
     protected const DESCRIPTION = 'Execute AsyncActivity\GreetingWorkflow';
 
-    public function execute(InputInterface $input, OutputInterface $output)
+    public function execute(InputInterface $input, OutputInterface $output): int
     {
         $workflow = $this->workflowClient->newWorkflowStub(
             AsyncGreetingWorkflowInterface::class,
diff --git a/app/src/AsyncActivityCompletion/CompleteCommand.php b/app/src/AsyncActivityCompletion/CompleteCommand.php
index 92160de..5524cd6 100644
--- a/app/src/AsyncActivityCompletion/CompleteCommand.php
+++ b/app/src/AsyncActivityCompletion/CompleteCommand.php
@@ -26,7 +26,7 @@ class CompleteCommand extends Command
         ['message', InputArgument::REQUIRED, 'Activity token'],
     ];
 
-    public function execute(InputInterface $input, OutputInterface $output)
+    public function execute(InputInterface $input, OutputInterface $output): int
     {
         // @@@SNIPSTART samples-php-async-activity-completion-completebytoken
         $client = $this->workflowClient->newActivityCompletionClient();
diff --git a/app/src/AsyncActivityCompletion/ExecuteCommand.php b/app/src/AsyncActivityCompletion/ExecuteCommand.php
index b59c42e..787ca30 100644
--- a/app/src/AsyncActivityCompletion/ExecuteCommand.php
+++ b/app/src/AsyncActivityCompletion/ExecuteCommand.php
@@ -22,7 +22,7 @@ class ExecuteCommand extends Command
     protected const NAME = 'user-activity:start';
     protected const DESCRIPTION = 'Execute AsyncActivityCompletion\GreetingWorkflow and wait for user greeting';
 
-    public function execute(InputInterface $input, OutputInterface $output)
+    public function execute(InputInterface $input, OutputInterface $output): int
     {
         $workflow = $this->workflowClient->newWorkflowStub(
             GreetingWorkflowInterface::class,
diff --git a/app/src/AsyncClosure/ExecuteCommand.php b/app/src/AsyncClosure/ExecuteCommand.php
index 3949d27..e3b4b7d 100644
--- a/app/src/AsyncClosure/ExecuteCommand.php
+++ b/app/src/AsyncClosure/ExecuteCommand.php
@@ -22,7 +22,7 @@ class ExecuteCommand extends Command
     protected const NAME = 'async-closure';
     protected const DESCRIPTION = 'Execute AsyncClosure\GreetingWorkflow';
 
-    public function execute(InputInterface $input, OutputInterface $output)
+    public function execute(InputInterface $input, OutputInterface $output): int
     {
         $workflow = $this->workflowClient->newWorkflowStub(
             AsyncGreetingWorkflowInterface::class,
diff --git a/app/src/BookingSaga/ExecuteCommand.php b/app/src/BookingSaga/ExecuteCommand.php
index e0022fc..2bb8dc4 100644
--- a/app/src/BookingSaga/ExecuteCommand.php
+++ b/app/src/BookingSaga/ExecuteCommand.php
@@ -22,7 +22,7 @@ class ExecuteCommand extends Command
     protected const NAME = 'booking-saga';
     protected const DESCRIPTION = 'Execute BookingSaga\TripBookingWorkflow';
 
-    public function execute(InputInterface $input, OutputInterface $output)
+    public function execute(InputInterface $input, OutputInterface $output): int
     {
         $workflow = $this->workflowClient->newWorkflowStub(
             TripBookingWorkflowInterface::class,
diff --git a/app/src/CancellationScope/ExecuteCommand.php b/app/src/CancellationScope/ExecuteCommand.php
index 860ae56..2ee4637 100644
--- a/app/src/CancellationScope/ExecuteCommand.php
+++ b/app/src/CancellationScope/ExecuteCommand.php
@@ -22,7 +22,7 @@ class ExecuteCommand extends Command
     protected const NAME = 'cancellation-scope';
     protected const DESCRIPTION = 'Execute CancellationScope\GreetingWorkflow';
 
-    public function execute(InputInterface $input, OutputInterface $output)
+    public function execute(InputInterface $input, OutputInterface $output): int
     {
         $workflow = $this->workflowClient->newWorkflowStub(
             GreetingWorkflowInterface::class,
diff --git a/app/src/Child/ExecuteCommand.php b/app/src/Child/ExecuteCommand.php
index 4904bbe..7c4df24 100644
--- a/app/src/Child/ExecuteCommand.php
+++ b/app/src/Child/ExecuteCommand.php
@@ -22,7 +22,7 @@ class ExecuteCommand extends Command
     protected const NAME = 'child';
     protected const DESCRIPTION = 'Execute Child\ParentWorkflow';
 
-    public function execute(InputInterface $input, OutputInterface $output)
+    public function execute(InputInterface $input, OutputInterface $output): int
     {
         $workflow = $this->workflowClient->newWorkflowStub(
             ParentWorkflowInterface::class,
diff --git a/app/src/Cron/ExecuteCommand.php b/app/src/Cron/ExecuteCommand.php
index a9d90ff..97939c3 100644
--- a/app/src/Cron/ExecuteCommand.php
+++ b/app/src/Cron/ExecuteCommand.php
@@ -23,7 +23,7 @@ class ExecuteCommand extends Command
     protected const NAME = 'cron';
     protected const DESCRIPTION = 'Start Cron\CronWorkflow';
 
-    public function execute(InputInterface $input, OutputInterface $output)
+    public function execute(InputInterface $input, OutputInterface $output): int
     {
         // Sets the cron schedule using the WorkflowOptions.
         // The cron format is parsed by "https://github.com/robfig/cron" library.
diff --git a/app/src/Exception/ExecuteCommand.php b/app/src/Exception/ExecuteCommand.php
index b16729b..9d7c3d8 100644
--- a/app/src/Exception/ExecuteCommand.php
+++ b/app/src/Exception/ExecuteCommand.php
@@ -23,7 +23,7 @@ class ExecuteCommand extends Command
     protected const NAME = 'exception';
     protected const DESCRIPTION = 'Execute Exception\FailedWorkflow with multiple signals';
 
-    public function execute(InputInterface $input, OutputInterface $output)
+    public function execute(InputInterface $input, OutputInterface $output): int
     {
         $workflow = $this->workflowClient->newWorkflowStub(
             FailedWorkflow::class,
diff --git a/app/src/FileProcessing/ExecuteCommand.php b/app/src/FileProcessing/ExecuteCommand.php
index 72761c1..feeda6e 100644
--- a/app/src/FileProcessing/ExecuteCommand.php
+++ b/app/src/FileProcessing/ExecuteCommand.php
@@ -28,7 +28,7 @@ class ExecuteCommand extends Command
         ['url', InputArgument::REQUIRED, 'Download URL']
     ];
 
-    public function execute(InputInterface $input, OutputInterface $output)
+    public function execute(InputInterface $input, OutputInterface $output): int
     {
         $workflow = $this->workflowClient->newWorkflowStub(
             FileProcessingWorkflowInterface::class,
diff --git a/app/src/Interceptors/ExecuteCommand.php b/app/src/Interceptors/ExecuteCommand.php
index b1ca0ff..7e9003f 100644
--- a/app/src/Interceptors/ExecuteCommand.php
+++ b/app/src/Interceptors/ExecuteCommand.php
@@ -23,7 +23,7 @@ class ExecuteCommand extends Command
     protected const NAME = 'interceptors';
     protected const DESCRIPTION = 'Execute workflow with interceptors';
 
-    public function execute(InputInterface $input, OutputInterface $output)
+    public function execute(InputInterface $input, OutputInterface $output): int
     {
         $workflow = $this->workflowClient->newWorkflowStub(
             TestActivityAttributesInterceptor::class,
diff --git a/app/src/LocalActivity/ExecuteCommand.php b/app/src/LocalActivity/ExecuteCommand.php
index a07eade..a7609b8 100644
--- a/app/src/LocalActivity/ExecuteCommand.php
+++ b/app/src/LocalActivity/ExecuteCommand.php
@@ -22,7 +22,7 @@ class ExecuteCommand extends Command
     protected const NAME = 'local-activity';
     protected const DESCRIPTION = 'Execute LocalActivity\GreetingWorkflow';
 
-    public function execute(InputInterface $input, OutputInterface $output)
+    public function execute(InputInterface $input, OutputInterface $output): int
     {
         $workflow = $this->workflowClient->newWorkflowStub(
             GreetingWorkflowInterface::class,
diff --git a/app/src/MoneyBatch/ExecuteCommand.php b/app/src/MoneyBatch/ExecuteCommand.php
index 744aef1..1dc8148 100644
--- a/app/src/MoneyBatch/ExecuteCommand.php
+++ b/app/src/MoneyBatch/ExecuteCommand.php
@@ -22,7 +22,7 @@ class ExecuteCommand extends Command
     protected const NAME = 'money-batch';
     protected const DESCRIPTION = 'Execute MoneyBatch\MoneyBatchWorkflow with multiple signals and queries';
 
-    public function execute(InputInterface $input, OutputInterface $output)
+    public function execute(InputInterface $input, OutputInterface $output): int
     {
         $workflow = $this->workflowClient->newWorkflowStub(
             MoneyBatchWorkflowInterface::class,
diff --git a/app/src/MoneyTransfer/ExecuteCommand.php b/app/src/MoneyTransfer/ExecuteCommand.php
index 86fe832..a144631 100644
--- a/app/src/MoneyTransfer/ExecuteCommand.php
+++ b/app/src/MoneyTransfer/ExecuteCommand.php
@@ -20,7 +20,7 @@ class ExecuteCommand extends Command
     protected const NAME = 'money-transfer';
     protected const DESCRIPTION = 'Execute MoneyTransferWorkflow';
 
-    public function execute(InputInterface $input, OutputInterface $output)
+    public function execute(InputInterface $input, OutputInterface $output): int
     {
         $workflow = $this->workflowClient->newWorkflowStub(AccountTransferWorkflowInterface::class);
         $output->writeln("Starting <comment>MoneyTransferWorkflow</comment>... ");
diff --git a/app/src/Periodic/ExecuteCommand.php b/app/src/Periodic/ExecuteCommand.php
index 28e3dca..05d7a48 100644
--- a/app/src/Periodic/ExecuteCommand.php
+++ b/app/src/Periodic/ExecuteCommand.php
@@ -22,7 +22,7 @@ class ExecuteCommand extends Command
     protected const NAME = 'periodic:start';
     protected const DESCRIPTION = 'Start Periodic\PeriodicWorkflow';
 
-    public function execute(InputInterface $input, OutputInterface $output)
+    public function execute(InputInterface $input, OutputInterface $output): int
     {
         $workflow = $this->workflowClient->newWorkflowStub(
             PeriodicWorkflowInterface::class,
diff --git a/app/src/Periodic/StopCommand.php b/app/src/Periodic/StopCommand.php
index 69569ba..65dc6b0 100644
--- a/app/src/Periodic/StopCommand.php
+++ b/app/src/Periodic/StopCommand.php
@@ -20,7 +20,7 @@ class StopCommand extends Command
     protected const NAME = 'periodic:stop';
     protected const DESCRIPTION = 'Stop Periodic\PeriodicWorkflow';
 
-    public function execute(InputInterface $input, OutputInterface $output)
+    public function execute(InputInterface $input, OutputInterface $output): int
     {
         $workflow = $this->workflowClient->newUntypedRunningWorkflowStub(
             PeriodicWorkflowInterface::WORKFLOW_ID
diff --git a/app/src/PolymorphicActivity/ExecuteCommand.php b/app/src/PolymorphicActivity/ExecuteCommand.php
index 52002de..bfa0507 100644
--- a/app/src/PolymorphicActivity/ExecuteCommand.php
+++ b/app/src/PolymorphicActivity/ExecuteCommand.php
@@ -22,7 +22,7 @@ class ExecuteCommand extends Command
     protected const NAME = 'polymorphic';
     protected const DESCRIPTION = 'Execute PolymorphicActivity\GreetingWorkflow';
 
-    public function execute(InputInterface $input, OutputInterface $output)
+    public function execute(InputInterface $input, OutputInterface $output): int
     {
         $workflow = $this->workflowClient->newWorkflowStub(
             GreetingWorkflowInterface::class,
diff --git a/app/src/Query/ExecuteCommand.php b/app/src/Query/ExecuteCommand.php
index c28ba97..dc9522f 100644
--- a/app/src/Query/ExecuteCommand.php
+++ b/app/src/Query/ExecuteCommand.php
@@ -22,7 +22,7 @@ class ExecuteCommand extends Command
     protected const NAME = 'query';
     protected const DESCRIPTION = 'Execute Query\QueryWorkflow with additional query and timer';
 
-    public function execute(InputInterface $input, OutputInterface $output)
+    public function execute(InputInterface $input, OutputInterface $output): int
     {
         $workflow = $this->workflowClient->newWorkflowStub(
             QueryWorkflowInterface::class,
diff --git a/app/src/Replay/ExecuteCommand.php b/app/src/Replay/ExecuteCommand.php
index c8df2d5..02d9dae 100644
--- a/app/src/Replay/ExecuteCommand.php
+++ b/app/src/Replay/ExecuteCommand.php
@@ -30,7 +30,7 @@ class ExecuteCommand extends Command
     ];
     protected const DESCRIPTION = 'Replay workflow executions from history events';
 
-    public function execute(InputInterface $input, OutputInterface $output)
+    public function execute(InputInterface $input, OutputInterface $output): int
     {
         $replayer = new WorkflowReplayer();
         $workflowType = $input->getArgument('workflow-type');
diff --git a/app/src/Saga/ExecuteCommand.php b/app/src/Saga/ExecuteCommand.php
index ac630a5..b199bd8 100644
--- a/app/src/Saga/ExecuteCommand.php
+++ b/app/src/Saga/ExecuteCommand.php
@@ -22,7 +22,7 @@ class ExecuteCommand extends Command
     protected const NAME = 'saga';
     protected const DESCRIPTION = 'Execute Saga\SagaWorkflow with multiple signals';
 
-    public function execute(InputInterface $input, OutputInterface $output)
+    public function execute(InputInterface $input, OutputInterface $output): int
     {
         $workflow = $this->workflowClient->newWorkflowStub(
             SagaWorkflowInterface::class,
diff --git a/app/src/Schedule/CreateCommand.php b/app/src/Schedule/CreateCommand.php
index 714271a..89e5077 100644
--- a/app/src/Schedule/CreateCommand.php
+++ b/app/src/Schedule/CreateCommand.php
@@ -34,7 +34,7 @@ class CreateCommand extends Command
     ];
 
 
-    public function execute(InputInterface $input, OutputInterface $output)
+    public function execute(InputInterface $input, OutputInterface $output): int
     {
         $specInit = $spec = Schedule\Spec\ScheduleSpec::new()
             ->withJitter('10m');
diff --git a/app/src/Schedule/DeleteCommand.php b/app/src/Schedule/DeleteCommand.php
index 10c16a5..9b534d9 100644
--- a/app/src/Schedule/DeleteCommand.php
+++ b/app/src/Schedule/DeleteCommand.php
@@ -23,7 +23,7 @@ class DeleteCommand extends Command
     protected const NAME = 'schedule:delete';
     protected const DESCRIPTION = 'Delete scheduled workflow';
 
-    public function execute(InputInterface $input, OutputInterface $output)
+    public function execute(InputInterface $input, OutputInterface $output): int
     {
         $handle = $this->scheduleClient->getHandle(ScheduleWorkflowInterface::SCHEDULE_ID);
 
diff --git a/app/src/Schedule/DescribeCommand.php b/app/src/Schedule/DescribeCommand.php
index ab2839c..703c128 100644
--- a/app/src/Schedule/DescribeCommand.php
+++ b/app/src/Schedule/DescribeCommand.php
@@ -21,7 +21,7 @@ class DescribeCommand extends Command
     protected const NAME = 'schedule:describe';
     protected const DESCRIPTION = 'Describe the Schedule';
 
-    public function execute(InputInterface $input, OutputInterface $output)
+    public function execute(InputInterface $input, OutputInterface $output): int
     {
         $handle = $this->scheduleClient->getHandle(ScheduleWorkflowInterface::SCHEDULE_ID);
 
diff --git a/app/src/Schedule/ListCommand.php b/app/src/Schedule/ListCommand.php
index b574bae..729dd30 100644
--- a/app/src/Schedule/ListCommand.php
+++ b/app/src/Schedule/ListCommand.php
@@ -21,7 +21,7 @@ class ListCommand extends Command
     protected const NAME = 'schedule:list';
     protected const DESCRIPTION = 'List all Schedules';
 
-    public function execute(InputInterface $input, OutputInterface $output)
+    public function execute(InputInterface $input, OutputInterface $output): int
     {
         $schedules = $this->scheduleClient->listSchedules();
 
diff --git a/app/src/SearchAttributes/ExecuteCommand.php b/app/src/SearchAttributes/ExecuteCommand.php
index f052a69..9512fb6 100644
--- a/app/src/SearchAttributes/ExecuteCommand.php
+++ b/app/src/SearchAttributes/ExecuteCommand.php
@@ -22,7 +22,7 @@ class ExecuteCommand extends Command
     protected const NAME = 'search-attributes';
     protected const DESCRIPTION = 'Execute SearchAttributes\GreetingWorkflow';
 
-    public function execute(InputInterface $input, OutputInterface $output)
+    public function execute(InputInterface $input, OutputInterface $output): int
     {
         $workflow = $this->workflowClient->newWorkflowStub(
             GreetingWorkflowInterface::class,
diff --git a/app/src/Signal/ExecuteCommand.php b/app/src/Signal/ExecuteCommand.php
index ba61181..5a4fc0c 100644
--- a/app/src/Signal/ExecuteCommand.php
+++ b/app/src/Signal/ExecuteCommand.php
@@ -22,7 +22,7 @@ class ExecuteCommand extends Command
     protected const NAME = 'signal';
     protected const DESCRIPTION = 'Execute Signal\SignalWorkflow with multiple signals';
 
-    public function execute(InputInterface $input, OutputInterface $output)
+    public function execute(InputInterface $input, OutputInterface $output): int
     {
         $workflow = $this->workflowClient->newWorkflowStub(
             SignalWorkflowInterface::class,
diff --git a/app/src/SimpleActivity/ExecuteCommand.php b/app/src/SimpleActivity/ExecuteCommand.php
index 369ec88..bc2eab2 100644
--- a/app/src/SimpleActivity/ExecuteCommand.php
+++ b/app/src/SimpleActivity/ExecuteCommand.php
@@ -23,7 +23,7 @@ class ExecuteCommand extends Command
     protected const NAME = 'simple-activity';
     protected const DESCRIPTION = 'Execute SimpleActivity\GreetingWorkflow';
 
-    public function execute(InputInterface $input, OutputInterface $output)
+    public function execute(InputInterface $input, OutputInterface $output): int
     {
         $workflow = $this->workflowClient->newWorkflowStub(
             GreetingWorkflowInterface::class,
diff --git a/app/src/Subscription/CancelCommand.php b/app/src/Subscription/CancelCommand.php
index e0d9989..c8446a2 100644
--- a/app/src/Subscription/CancelCommand.php
+++ b/app/src/Subscription/CancelCommand.php
@@ -28,7 +28,7 @@ class CancelCommand extends Command
         ['userID', InputArgument::REQUIRED, 'Unique user ID']
     ];
 
-    public function execute(InputInterface $input, OutputInterface $output)
+    public function execute(InputInterface $input, OutputInterface $output): int
     {
         $userID = $input->getArgument('userID');
 
diff --git a/app/src/Subscription/SubscribeCommand.php b/app/src/Subscription/SubscribeCommand.php
index 9faa3d5..290c8bb 100644
--- a/app/src/Subscription/SubscribeCommand.php
+++ b/app/src/Subscription/SubscribeCommand.php
@@ -29,7 +29,7 @@ class SubscribeCommand extends Command
         ['userID', InputArgument::REQUIRED, 'Unique user ID']
     ];
 
-    public function execute(InputInterface $input, OutputInterface $output)
+    public function execute(InputInterface $input, OutputInterface $output): int
     {
         $userID = $input->getArgument('userID');
 
diff --git a/app/src/UpdatableTimer/ExecuteCommand.php b/app/src/UpdatableTimer/ExecuteCommand.php
index ab4aa1d..af21bf8 100644
--- a/app/src/UpdatableTimer/ExecuteCommand.php
+++ b/app/src/UpdatableTimer/ExecuteCommand.php
@@ -24,7 +24,7 @@ class ExecuteCommand extends Command
     protected const NAME = 'updatable-timer:start';
     protected const DESCRIPTION = 'Execute UpdatableTimer\DynamicSleepWorkflow';
 
-    public function execute(InputInterface $input, OutputInterface $output)
+    public function execute(InputInterface $input, OutputInterface $output): int
     {
         $workflow = $this->workflowClient->newWorkflowStub(
             DynamicSleepWorkflowInterface::class,
diff --git a/app/src/UpdatableTimer/ProlongCommand.php b/app/src/UpdatableTimer/ProlongCommand.php
index fca70b1..53d06fc 100644
--- a/app/src/UpdatableTimer/ProlongCommand.php
+++ b/app/src/UpdatableTimer/ProlongCommand.php
@@ -20,7 +20,7 @@ class ProlongCommand extends Command
     protected const NAME = 'updatable-timer:prolong';
     protected const DESCRIPTION = 'Prolong the duration of UpdatableTimer\DynamicSleepWorkflow';
 
-    public function execute(InputInterface $input, OutputInterface $output)
+    public function execute(InputInterface $input, OutputInterface $output): int
     {
         $workflow = $this->workflowClient->newRunningWorkflowStub(
             DynamicSleepWorkflowInterface::class,
diff --git a/app/src/Updates/ExecuteCommand.php b/app/src/Updates/ExecuteCommand.php
index 9e3a717..8c193e6 100644
--- a/app/src/Updates/ExecuteCommand.php
+++ b/app/src/Updates/ExecuteCommand.php
@@ -38,7 +38,7 @@ class ExecuteCommand extends Command
     private InputInterface $input;
     private OutputInterface $output;
 
-    public function execute(InputInterface $input, OutputInterface $output)
+    public function execute(InputInterface $input, OutputInterface $output): int
     {
         $this->input = $input;
         $this->output = $output;