diff --git a/lib/Doctrine/Migrations/MigrationRepository.php b/lib/Doctrine/Migrations/MigrationRepository.php
index c98faa7c4d..31a4292794 100644
--- a/lib/Doctrine/Migrations/MigrationRepository.php
+++ b/lib/Doctrine/Migrations/MigrationRepository.php
@@ -355,7 +355,7 @@ public function getRelativeVersion(string $version, int $delta) : ?string
             return null;
         }
 
-        $relativeVersion = ((int) $offset) + $delta;
+        $relativeVersion = $offset + $delta;
 
         if (! isset($versions[$relativeVersion])) {
             // Unknown version or delta out of bounds.
diff --git a/lib/Doctrine/Migrations/Tools/Console/Command/AbstractCommand.php b/lib/Doctrine/Migrations/Tools/Console/Command/AbstractCommand.php
index a42ab0fad5..77b599755d 100644
--- a/lib/Doctrine/Migrations/Tools/Console/Command/AbstractCommand.php
+++ b/lib/Doctrine/Migrations/Tools/Console/Command/AbstractCommand.php
@@ -17,6 +17,7 @@
 use Symfony\Component\Console\Input\InputOption;
 use Symfony\Component\Console\Output\OutputInterface;
 use Symfony\Component\Console\Question\ConfirmationQuestion;
+use function assert;
 use function escapeshellarg;
 use function proc_open;
 use function str_repeat;
@@ -111,8 +112,10 @@ protected function getMigrationConfiguration(
     ) : Configuration {
         if ($this->migrationConfiguration === null) {
             if ($this->hasConfigurationHelper()) {
+                $helperSet = $this->getHelperSet();
+                assert($helperSet !== null);
                 /** @var ConfigurationHelper $configHelper */
-                $configHelper = $this->getHelperSet()->get('configuration');
+                $configHelper = $helperSet->get('configuration');
             } else {
                 $configHelper = new ConfigurationHelper(
                     $this->getConnection($input),
@@ -187,8 +190,10 @@ private function hasConfigurationHelper() : bool
     private function getConnection(InputInterface $input) : Connection
     {
         if ($this->connection === null) {
+            $helperSet = $this->getHelperSet();
+            assert($helperSet !== null);
             $this->connection = (new ConnectionLoader($this->configuration))
-                ->getConnection($input, $this->getHelperSet());
+                ->getConnection($input, $helperSet);
         }
 
         return $this->connection;
diff --git a/lib/Doctrine/Migrations/Tools/Console/Command/DiffCommand.php b/lib/Doctrine/Migrations/Tools/Console/Command/DiffCommand.php
index 7f5b4121de..f8bd0d6e82 100644
--- a/lib/Doctrine/Migrations/Tools/Console/Command/DiffCommand.php
+++ b/lib/Doctrine/Migrations/Tools/Console/Command/DiffCommand.php
@@ -14,8 +14,12 @@
 use Symfony\Component\Console\Input\InputOption;
 use Symfony\Component\Console\Output\OutputInterface;
 use const FILTER_VALIDATE_BOOLEAN;
+use function assert;
 use function class_exists;
 use function filter_var;
+use function is_array;
+use function is_bool;
+use function is_string;
 use function sprintf;
 
 /**
@@ -111,11 +115,14 @@ public function execute(
         OutputInterface $output
     ) : ?int {
         $filterExpression = $input->getOption('filter-expression') ?? null;
-        $formatted        = (bool) $input->getOption('formatted');
-        $lineLength       = (int) $input->getOption('line-length');
-        $allowEmptyDiff   = (bool) $input->getOption('allow-empty-diff');
-        $checkDbPlatform  = filter_var($input->getOption('check-database-platform'), FILTER_VALIDATE_BOOLEAN);
-        $fromEmptySchema  = (bool) $input->getOption('from-empty-schema');
+        assert(is_string($filterExpression) || $filterExpression === null);
+        $formatted  = (bool) $input->getOption('formatted');
+        $lineLength = $input->getOption('line-length');
+        assert(! is_array($lineLength) && ! is_bool($lineLength));
+        $lineLength      = (int) $lineLength;
+        $allowEmptyDiff  = (bool) $input->getOption('allow-empty-diff');
+        $checkDbPlatform = filter_var($input->getOption('check-database-platform'), FILTER_VALIDATE_BOOLEAN);
+        $fromEmptySchema = (bool) $input->getOption('from-empty-schema');
 
         if ($formatted) {
             if (! class_exists('SqlFormatter')) {
@@ -146,6 +153,7 @@ public function execute(
         }
 
         $editorCommand = $input->getOption('editor-cmd');
+        assert(is_string($editorCommand) || $editorCommand === null);
 
         if ($editorCommand !== null) {
             $this->procOpen($editorCommand, $path);
diff --git a/lib/Doctrine/Migrations/Tools/Console/Command/DumpSchemaCommand.php b/lib/Doctrine/Migrations/Tools/Console/Command/DumpSchemaCommand.php
index c1bb788742..33d16e4b77 100644
--- a/lib/Doctrine/Migrations/Tools/Console/Command/DumpSchemaCommand.php
+++ b/lib/Doctrine/Migrations/Tools/Console/Command/DumpSchemaCommand.php
@@ -9,8 +9,12 @@
 use Symfony\Component\Console\Input\InputInterface;
 use Symfony\Component\Console\Input\InputOption;
 use Symfony\Component\Console\Output\OutputInterface;
+use function assert;
 use function class_exists;
 use function count;
+use function is_array;
+use function is_bool;
+use function is_string;
 use function sprintf;
 
 /**
@@ -68,7 +72,9 @@ public function execute(
         OutputInterface $output
     ) : ?int {
         $formatted  = (bool) $input->getOption('formatted');
-        $lineLength = (int) $input->getOption('line-length');
+        $lineLength = $input->getOption('line-length');
+        assert(! is_array($lineLength) && ! is_bool($lineLength));
+        $lineLength = (int) $lineLength;
 
         $schemaDumper = $this->dependencyFactory->getSchemaDumper();
         $versions     = $this->migrationRepository->getVersions();
@@ -94,6 +100,7 @@ public function execute(
         );
 
         $editorCommand = $input->getOption('editor-cmd');
+        assert(is_string($editorCommand) || $editorCommand === null);
 
         if ($editorCommand !== null) {
             $this->procOpen($editorCommand, $path);
diff --git a/lib/Doctrine/Migrations/Tools/Console/Command/ExecuteCommand.php b/lib/Doctrine/Migrations/Tools/Console/Command/ExecuteCommand.php
index dd7680735f..6084299f57 100644
--- a/lib/Doctrine/Migrations/Tools/Console/Command/ExecuteCommand.php
+++ b/lib/Doctrine/Migrations/Tools/Console/Command/ExecuteCommand.php
@@ -10,7 +10,9 @@
 use Symfony\Component\Console\Input\InputInterface;
 use Symfony\Component\Console\Input\InputOption;
 use Symfony\Component\Console\Output\OutputInterface;
+use function assert;
 use function getcwd;
+use function is_string;
 
 /**
  * The ExecutCommand class is responsible for executing a single migration version up or down.
@@ -92,7 +94,8 @@ protected function configure() : void
 
     public function execute(InputInterface $input, OutputInterface $output) : ?int
     {
-        $version        = $input->getArgument('version');
+        $version = $input->getArgument('version');
+        assert(is_string($version));
         $timeAllQueries = (bool) $input->getOption('query-time');
         $dryRun         = (bool) $input->getOption('dry-run');
         $path           = $input->getOption('write-sql');
@@ -104,6 +107,7 @@ public function execute(InputInterface $input, OutputInterface $output) : ?int
 
         if ($path !== false) {
             $path = $path ?? getcwd();
+            assert(is_string($path));
 
             $version->writeSqlFile($path, $direction);
 
diff --git a/lib/Doctrine/Migrations/Tools/Console/Command/GenerateCommand.php b/lib/Doctrine/Migrations/Tools/Console/Command/GenerateCommand.php
index 18a696c4f6..80130feb8b 100644
--- a/lib/Doctrine/Migrations/Tools/Console/Command/GenerateCommand.php
+++ b/lib/Doctrine/Migrations/Tools/Console/Command/GenerateCommand.php
@@ -7,6 +7,8 @@
 use Symfony\Component\Console\Input\InputInterface;
 use Symfony\Component\Console\Input\InputOption;
 use Symfony\Component\Console\Output\OutputInterface;
+use function assert;
+use function is_string;
 use function sprintf;
 
 /**
@@ -51,6 +53,7 @@ public function execute(InputInterface $input, OutputInterface $output) : ?int
         $path = $migrationGenerator->generateMigration($versionNumber);
 
         $editorCommand = $input->getOption('editor-cmd');
+        assert(is_string($editorCommand) || $editorCommand === null);
 
         if ($editorCommand !== null) {
             $this->procOpen($editorCommand, $path);
diff --git a/lib/Doctrine/Migrations/Tools/Console/Command/MigrateCommand.php b/lib/Doctrine/Migrations/Tools/Console/Command/MigrateCommand.php
index 159a7575f3..3c01e41aef 100644
--- a/lib/Doctrine/Migrations/Tools/Console/Command/MigrateCommand.php
+++ b/lib/Doctrine/Migrations/Tools/Console/Command/MigrateCommand.php
@@ -11,8 +11,10 @@
 use Symfony\Component\Console\Input\InputInterface;
 use Symfony\Component\Console\Input\InputOption;
 use Symfony\Component\Console\Output\OutputInterface;
+use function assert;
 use function count;
 use function getcwd;
+use function is_string;
 use function sprintf;
 use function substr;
 
@@ -115,7 +117,8 @@ public function execute(InputInterface $input, OutputInterface $output) : ?int
     {
         $this->outputHeader($output);
 
-        $version          = (string) $input->getArgument('version');
+        $version = $input->getArgument('version');
+        assert(is_string($version));
         $path             = $input->getOption('write-sql');
         $allowNoMigration = (bool) $input->getOption('allow-no-migration');
         $timeAllQueries   = (bool) $input->getOption('query-time');
@@ -142,6 +145,7 @@ public function execute(InputInterface $input, OutputInterface $output) : ?int
         if ($path !== false) {
             $path = $path ?? getcwd();
 
+            assert(is_string($path));
             $migrator->writeSqlFile($path, $version);
 
             return 0;
diff --git a/lib/Doctrine/Migrations/Tools/Console/Command/VersionCommand.php b/lib/Doctrine/Migrations/Tools/Console/Command/VersionCommand.php
index 2244da39df..b4a5d88e29 100644
--- a/lib/Doctrine/Migrations/Tools/Console/Command/VersionCommand.php
+++ b/lib/Doctrine/Migrations/Tools/Console/Command/VersionCommand.php
@@ -12,6 +12,8 @@
 use Symfony\Component\Console\Input\InputInterface;
 use Symfony\Component\Console\Input\InputOption;
 use Symfony\Component\Console\Output\OutputInterface;
+use function assert;
+use function is_string;
 use function sprintf;
 
 /**
@@ -128,6 +130,8 @@ public function execute(InputInterface $input, OutputInterface $output) : ?int
     private function markVersions(InputInterface $input, OutputInterface $output) : void
     {
         $affectedVersion = $input->getArgument('version');
+        assert(is_string($affectedVersion) || $affectedVersion === null);
+
         $allOption       = $input->getOption('all');
         $rangeFromOption = $input->getOption('range-from');
         $rangeToOption   = $input->getOption('range-to');
diff --git a/lib/Doctrine/Migrations/Tools/Console/ConnectionLoader.php b/lib/Doctrine/Migrations/Tools/Console/ConnectionLoader.php
index 92fbadf6db..1c0f2523e2 100644
--- a/lib/Doctrine/Migrations/Tools/Console/ConnectionLoader.php
+++ b/lib/Doctrine/Migrations/Tools/Console/ConnectionLoader.php
@@ -14,6 +14,8 @@
 use Doctrine\Migrations\Tools\Console\Exception\ConnectionNotSpecified;
 use Symfony\Component\Console\Helper\HelperSet;
 use Symfony\Component\Console\Input\InputInterface;
+use function assert;
+use function is_string;
 
 /**
  * The ConnectionLoader class is responsible for loading the Doctrine\DBAL\Connection instance to use for migrations.
@@ -46,8 +48,11 @@ protected function createConnectionConfigurationChainLoader(
         InputInterface $input,
         HelperSet $helperSet
     ) : ConnectionLoaderInterface {
+        $dbConfiguration = $input->getOption('db-configuration');
+        assert(is_string($dbConfiguration) || $dbConfiguration === null);
+
         return new ConnectionConfigurationChainLoader([
-            new ArrayConnectionConfigurationLoader($input->getOption('db-configuration')),
+            new ArrayConnectionConfigurationLoader($dbConfiguration),
             new ArrayConnectionConfigurationLoader('migrations-db.php'),
             new ConnectionHelperLoader($helperSet, 'connection'),
             new ConnectionConfigurationLoader($this->configuration),
diff --git a/lib/Doctrine/Migrations/Tools/Console/Helper/ConfigurationHelper.php b/lib/Doctrine/Migrations/Tools/Console/Helper/ConfigurationHelper.php
index a4d21ea159..4e3b096c56 100644
--- a/lib/Doctrine/Migrations/Tools/Console/Helper/ConfigurationHelper.php
+++ b/lib/Doctrine/Migrations/Tools/Console/Helper/ConfigurationHelper.php
@@ -13,7 +13,9 @@
 use Doctrine\Migrations\Tools\Console\Exception\FileTypeNotSupported;
 use Symfony\Component\Console\Helper\Helper;
 use Symfony\Component\Console\Input\InputInterface;
+use function assert;
 use function file_exists;
+use function is_string;
 use function pathinfo;
 
 /**
@@ -45,6 +47,8 @@ public function getMigrationConfig(InputInterface $input) : Configuration
         $configuration = $input->getOption('configuration');
 
         if ($configuration !== null) {
+            assert(is_string($configuration));
+
             return $this->loadConfig($configuration);
         }
 
diff --git a/phpstan.neon.dist b/phpstan.neon.dist
index 1722859116..6f673e5f68 100644
--- a/phpstan.neon.dist
+++ b/phpstan.neon.dist
@@ -16,6 +16,7 @@ parameters:
         - '~ProxyManager\\Proxy\\VirtualProxyInterface~'
         - '~^Parameter #1 \$files of method Doctrine\\Migrations\\Finder\\Finder::loadMigrationClasses\(\) expects array<string>, array<int, string\|false> given\.\z~'
         - '~^Class Doctrine\\Migrations\\Tests\\DoesNotExistAtAll not found\.\z~'
+        - '~^Call to method getVersion\(\) of deprecated class PackageVersions\\Versions\.$~'
 
 includes:
     - vendor/phpstan/phpstan-deprecation-rules/rules.neon
diff --git a/tests/Doctrine/Migrations/Tests/Functional/FunctionalTest.php b/tests/Doctrine/Migrations/Tests/Functional/FunctionalTest.php
index 98092caaca..14f0266599 100644
--- a/tests/Doctrine/Migrations/Tests/Functional/FunctionalTest.php
+++ b/tests/Doctrine/Migrations/Tests/Functional/FunctionalTest.php
@@ -521,6 +521,8 @@ public function testMigrateWithConnectionWithAutoCommitOffStillPersistsChanges()
     {
         $listener        = new AutoCommitListener();
         [$conn, $config] = self::fileConnectionAndConfig();
+        assert($conn instanceof Connection);
+        assert($config instanceof Configuration);
         $config->registerMigration('1', MigrateWithDataModification::class);
         $migrator = $this->createTestMigrator($config);
         $conn->getEventManager()->addEventSubscriber($listener);
@@ -552,6 +554,8 @@ public function testMigrationExecutedAt() : void
 
     /**
      * @return Connection[]|Configuration[]
+     *
+     * @psalm-return array{Connection,Configuration}
      */
     private static function fileConnectionAndConfig() : array
     {
diff --git a/tests/Doctrine/Migrations/Tests/MigrationTestCase.php b/tests/Doctrine/Migrations/Tests/MigrationTestCase.php
index 824b8a798d..f015d9b7ea 100644
--- a/tests/Doctrine/Migrations/Tests/MigrationTestCase.php
+++ b/tests/Doctrine/Migrations/Tests/MigrationTestCase.php
@@ -63,8 +63,10 @@ public function getOutputStreamContent(StreamOutput $streamOutput) : string
     {
         $stream = $streamOutput->getStream();
         rewind($stream);
+        $contents = stream_get_contents($stream);
+        assert($contents !== false);
 
-        return stream_get_contents($stream);
+        return $contents;
     }
 
     /** @return resource */
diff --git a/tests/Doctrine/Migrations/Tests/Provider/ClassMetadataFactory.php b/tests/Doctrine/Migrations/Tests/Provider/ClassMetadataFactory.php
index 8b6dd2cc50..9abc7cbcd8 100644
--- a/tests/Doctrine/Migrations/Tests/Provider/ClassMetadataFactory.php
+++ b/tests/Doctrine/Migrations/Tests/Provider/ClassMetadataFactory.php
@@ -4,8 +4,8 @@
 
 namespace Doctrine\Migrations\Tests\Provider;
 
-use Doctrine\Common\Persistence\Mapping\ClassMetadata;
 use Doctrine\ORM\Mapping\ClassMetadataFactory as BaseMetadataFactoryAlias;
+use Doctrine\Persistence\Mapping\ClassMetadata;
 use function array_reverse;
 
 class ClassMetadataFactory extends BaseMetadataFactoryAlias
diff --git a/tests/Doctrine/Migrations/Tests/Tools/Console/Command/AbstractCommandTest.php b/tests/Doctrine/Migrations/Tests/Tools/Console/Command/AbstractCommandTest.php
index 054c9e94f7..693316cb59 100644
--- a/tests/Doctrine/Migrations/Tests/Tools/Console/Command/AbstractCommandTest.php
+++ b/tests/Doctrine/Migrations/Tests/Tools/Console/Command/AbstractCommandTest.php
@@ -54,7 +54,9 @@ public function invokeMigrationConfigurationGetter(
         }
 
         if (! $noConnection) {
-            $command->getHelperSet()->set(
+            $helperSet = $command->getHelperSet();
+            assert($helperSet !== null);
+            $helperSet->set(
                 new ConnectionHelper($this->getSqliteConnection()),
                 'connection'
             );
diff --git a/tests/Doctrine/Migrations/Tests/Tools/Console/Command/CommandTestCase.php b/tests/Doctrine/Migrations/Tests/Tools/Console/Command/CommandTestCase.php
index 7fb0e355d9..a49b2290a6 100644
--- a/tests/Doctrine/Migrations/Tests/Tools/Console/Command/CommandTestCase.php
+++ b/tests/Doctrine/Migrations/Tests/Tools/Console/Command/CommandTestCase.php
@@ -12,6 +12,8 @@
 use Symfony\Component\Console\Application;
 use Symfony\Component\Console\Tester\CommandTester;
 use function array_replace;
+use function assert;
+use function is_string;
 
 abstract class CommandTestCase extends MigrationTestCase
 {
@@ -47,7 +49,10 @@ protected function createConnection() : Connection
 
     protected function createCommandTester() : CommandTester
     {
-        return new CommandTester($this->app->find($this->command->getName()));
+        $name = $this->command->getName();
+        assert(is_string($name));
+
+        return new CommandTester($this->app->find($name));
     }
 
     /**