diff --git a/composer.json b/composer.json
index 879395b..b0a111d 100644
--- a/composer.json
+++ b/composer.json
@@ -13,7 +13,7 @@
         "ext-pcntl": "*",
         "krak/schema": "^0.2.0",
         "psr/event-dispatcher": "^1.0",
-        "symfony/messenger": "^4.4|^5.4|^6.2"
+        "symfony/messenger": "^4.4|^5.4|^6.2|~7.0"
     },
     "autoload": {
         "psr-4": {
diff --git a/src/Command/AlertCommand.php b/src/Command/AlertCommand.php
index 16c3e28..4214c99 100644
--- a/src/Command/AlertCommand.php
+++ b/src/Command/AlertCommand.php
@@ -26,7 +26,7 @@ protected function configure() {
             ->setDescription('Raise any of the configured alerts.');
     }
 
-    protected function execute(InputInterface $input, OutputInterface $output) {
+    protected function execute(InputInterface $input, OutputInterface $output): int {
         foreach ($this->supervisorPoolConfigs as $poolConfig) {
             foreach (($this->raiseAlerts)($poolConfig) as $event) {
                 $this->eventDispatcher->dispatch($event);
diff --git a/src/Command/ConsumeCommand.php b/src/Command/ConsumeCommand.php
index 5f26b1b..2fdfafd 100644
--- a/src/Command/ConsumeCommand.php
+++ b/src/Command/ConsumeCommand.php
@@ -21,7 +21,7 @@ protected function configure() {
             ->setDescription('Start the supervisor to manage the worker consumers.');
     }
 
-    protected function execute(InputInterface $input, OutputInterface $output) {
+    protected function execute(InputInterface $input, OutputInterface $output): int {
         $output->writeln('<info>Starting Supervisor.</info>');
         $this->supervisor->run();
         return 0;
diff --git a/src/Command/Pool/PauseCommand.php b/src/Command/Pool/PauseCommand.php
index 98abcea..7dda5b7 100644
--- a/src/Command/Pool/PauseCommand.php
+++ b/src/Command/Pool/PauseCommand.php
@@ -13,7 +13,7 @@ protected function configure() {
             ->addPoolArgument('The names of the pools to perform a pause');
     }
 
-    protected function execute(InputInterface $input, OutputInterface $output) {
+    protected function execute(InputInterface $input, OutputInterface $output): int {
         $poolNames = $this->getPoolNames($input);
         foreach ($poolNames as $poolName) {
             $control = $this->poolControlFactory->createForActor($poolName);
diff --git a/src/Command/Pool/RestartCommand.php b/src/Command/Pool/RestartCommand.php
index 6f38d95..2219d91 100644
--- a/src/Command/Pool/RestartCommand.php
+++ b/src/Command/Pool/RestartCommand.php
@@ -13,7 +13,7 @@ protected function configure() {
             ->addPoolArgument('The names of the pools to perform a restart');
     }
 
-    protected function execute(InputInterface $input, OutputInterface $output) {
+    protected function execute(InputInterface $input, OutputInterface $output): int {
         $poolNames = $this->getPoolNames($input);
         foreach ($poolNames as $poolName) {
             $control = $this->poolControlFactory->createForActor($poolName);
diff --git a/src/Command/Pool/ResumeCommand.php b/src/Command/Pool/ResumeCommand.php
index 6c12193..769521a 100644
--- a/src/Command/Pool/ResumeCommand.php
+++ b/src/Command/Pool/ResumeCommand.php
@@ -13,7 +13,7 @@ protected function configure() {
             ->addPoolArgument('The names of the pools to perform a resume');
     }
 
-    protected function execute(InputInterface $input, OutputInterface $output) {
+    protected function execute(InputInterface $input, OutputInterface $output): int {
         $poolNames = $this->getPoolNames($input);
         foreach ($poolNames as $poolName) {
             $control = $this->poolControlFactory->createForActor($poolName);
diff --git a/src/Command/Pool/StatusCommand.php b/src/Command/Pool/StatusCommand.php
index 79a5f54..e9bb243 100644
--- a/src/Command/Pool/StatusCommand.php
+++ b/src/Command/Pool/StatusCommand.php
@@ -19,7 +19,7 @@ protected function configure() {
             ->addOption('poll-interval', 'i', InputOption::VALUE_REQUIRED, 'The interval to poll at, defaults to 5 seconds', 5);
     }
 
-    protected function execute(InputInterface $input, OutputInterface $output) {
+    protected function execute(InputInterface $input, OutputInterface $output): int {
         $poolNames = $this->getPoolNames($input);
         $shouldPoll = $input->getOption('poll');
         $pollInterval = $input->getOption('poll-interval');
diff --git a/src/EventLogger.php b/src/EventLogger.php
index 269fb84..64a021a 100644
--- a/src/EventLogger.php
+++ b/src/EventLogger.php
@@ -25,7 +25,7 @@ public function logEvent(string $message, string $event, array $context = []): v
         ]);
     }
 
-    public function log($level, $message, array $context = array()) {
+    public function log($level, string|\Stringable $message, array $context = []): void {
         $this->logger->log($level, $message, $context);
     }
 }
diff --git a/src/MessengerAutoScaleBundle.php b/src/MessengerAutoScaleBundle.php
index ad1b0a9..362b724 100644
--- a/src/MessengerAutoScaleBundle.php
+++ b/src/MessengerAutoScaleBundle.php
@@ -4,6 +4,7 @@
 
 use Symfony\Component\Config\Definition\Builder\BooleanNodeDefinition;
 use Symfony\Component\Config\Definition\Builder\ScalarNodeDefinition;
+use Symfony\Component\Config\Definition\Builder\TreeBuilder;
 use Symfony\Component\Config\Definition\ConfigurationInterface;
 use Symfony\Component\DependencyInjection\ContainerBuilder;
 use Symfony\Component\DependencyInjection\Extension\Extension;
@@ -49,7 +50,7 @@ public function load(array $configs, ContainerBuilder $container): void {
 
             public function getConfiguration(array $config, ContainerBuilder $container) {
                 return new class() implements ConfigurationInterface {
-                    public function getConfigTreeBuilder() {
+                    public function getConfigTreeBuilder(): TreeBuilder {
                         return configTree('messenger_auto_scale', struct([
                             'console_path' => string(['configure' => function(ScalarNodeDefinition $def) {
                                 $def->defaultValue('%kernel.project_dir%/bin/console');
diff --git a/src/PoolConfig.php b/src/PoolConfig.php
index 473163d..ad49f7a 100644
--- a/src/PoolConfig.php
+++ b/src/PoolConfig.php
@@ -83,7 +83,7 @@ public function attributes(): array {
         return $this->attributes;
     }
 
-    public function jsonSerialize() {
+    public function jsonSerialize(): mixed {
         return get_object_vars($this);
     }
 }