diff --git a/composer.json b/composer.json
index eefcb4d..5b494b5 100644
--- a/composer.json
+++ b/composer.json
@@ -40,7 +40,7 @@
         "paragonie/random_compat": ">=2",
         "phpunit/phpunit": "^9",
         "phpspec/prophecy-phpunit": "^2.0",
-        "friendsofphp/php-cs-fixer": "^3.21",
+        "friendsofphp/php-cs-fixer": "^3.62",
         "google/cloud-dlp": "^1.10",
         "google/cloud-storage": "^1.33",
         "google/cloud-secret-manager": "^1.12"
diff --git a/src/Fixers/ClientUpgradeFixer/ClientUpgradeFixer.php b/src/Fixers/ClientUpgradeFixer/ClientUpgradeFixer.php
index 7adf779..d86cf7d 100644
--- a/src/Fixers/ClientUpgradeFixer/ClientUpgradeFixer.php
+++ b/src/Fixers/ClientUpgradeFixer/ClientUpgradeFixer.php
@@ -3,23 +3,21 @@
 namespace Google\Cloud\Fixers\ClientUpgradeFixer;
 
 use PhpCsFixer\AbstractFixer;
-use PhpCsFixer\Fixer\FixerInterface;
 use PhpCsFixer\Fixer\Import\OrderedImportsFixer;
 use PhpCsFixer\FixerDefinition\FixerDefinitionInterface;
-use PhpCsFixer\Tokenizer\Analyzer\NamespaceUsesAnalyzer;
-use PhpCsFixer\Tokenizer\Analyzer\Analysis\NamespaceUseAnalysis;
-use PhpCsFixer\Tokenizer\CT;
+use PhpCsFixer\FixerDefinition\FixerDefinition;
 use PhpCsFixer\Tokenizer\Token;
 use PhpCsFixer\Tokenizer\Tokens;
-use ReflectionClass;
-use ReflectionMethod;
 use PhpCsFixer\Fixer\ConfigurableFixerInterface;
+use PhpCsFixer\Fixer\ConfigurableFixerTrait;
 use PhpCsFixer\FixerConfiguration\FixerConfigurationResolver;
 use PhpCsFixer\FixerConfiguration\FixerOptionBuilder;
 use PhpCsFixer\FixerConfiguration\FixerConfigurationResolverInterface;
 
 class ClientUpgradeFixer extends AbstractFixer implements ConfigurableFixerInterface
 {
+    use ConfigurableFixerTrait;
+
     /**
      * Check if the fixer is a candidate for given Tokens collection.
      *
@@ -34,19 +32,10 @@ public function isCandidate(Tokens $tokens): bool
         return true;
     }
 
-    /**
-     * @param array<string, mixed> $configuration
-     */
-    public function configure(array $configuration): void
-    {
-        // no configuration assumes true
-        $this->configuration = $configuration;
-    }
-
     /**
      * Defines the available configuration options of the fixer.
      */
-    public function getConfigurationDefinition(): FixerConfigurationResolverInterface
+    protected function createConfigurationDefinition(): FixerConfigurationResolverInterface
     {
         return new FixerConfigurationResolver([
             (new FixerOptionBuilder('clientVars', 'A map of client variables to their new class names'))
@@ -199,10 +188,10 @@ protected function applyFix(\SplFileInfo $file, Tokens $tokens): void
             $importedClasses = array_map(fn ($useDeclaration) => $useDeclaration->getFullName(), $useDeclarations);
             $classesToImport = array_filter(
                 $classesToImport,
-                fn($requestClass) => !isset($importedClasses[$requestClass->getName()])
+                fn ($requestClass) => !isset($importedClasses[$requestClass->getName()])
             );
             $requestClassImportTokens = array_map(
-                fn($requestClass) => $requestClass->getImportTokens(),
+                fn ($requestClass) => $requestClass->getImportTokens(),
                 array_values($classesToImport)
             );
             $tokens->insertAt($importStart, array_merge(...$requestClassImportTokens));
diff --git a/src/Fixers/ClientUpgradeFixer/RequestClass.php b/src/Fixers/ClientUpgradeFixer/RequestClass.php
index 78ca769..89c78a2 100644
--- a/src/Fixers/ClientUpgradeFixer/RequestClass.php
+++ b/src/Fixers/ClientUpgradeFixer/RequestClass.php
@@ -3,7 +3,6 @@
 namespace Google\Cloud\Fixers\ClientUpgradeFixer;
 
 use PhpCsFixer\Tokenizer\Token;
-use PhpCsFixer\Tokenizer\Tokens;
 use ReflectionClass;
 
 class RequestClass
diff --git a/src/Fixers/ClientUpgradeFixer/RequestVariableCounter.php b/src/Fixers/ClientUpgradeFixer/RequestVariableCounter.php
index 6f7dcc5..07fbf8e 100644
--- a/src/Fixers/ClientUpgradeFixer/RequestVariableCounter.php
+++ b/src/Fixers/ClientUpgradeFixer/RequestVariableCounter.php
@@ -2,8 +2,6 @@
 
 namespace Google\Cloud\Fixers\ClientUpgradeFixer;
 
-use PhpCsFixer\Tokenizer\Tokens;
-
 class RequestVariableCounter
 {
     private array $varCounts = [];
diff --git a/src/Fixers/ClientUpgradeFixer/RpcMethod.php b/src/Fixers/ClientUpgradeFixer/RpcMethod.php
index 9f3b109..6dca677 100644
--- a/src/Fixers/ClientUpgradeFixer/RpcMethod.php
+++ b/src/Fixers/ClientUpgradeFixer/RpcMethod.php
@@ -6,7 +6,6 @@
 use PhpCsFixer\Tokenizer\Token;
 use PhpCsFixer\Tokenizer\Tokens;
 use ReflectionMethod;
-use ReflectionParameter;
 
 class RpcMethod
 {
diff --git a/src/TestUtils/GcloudWrapper/AppEngine.php b/src/TestUtils/GcloudWrapper/AppEngine.php
index 333ecde..1d3702f 100644
--- a/src/TestUtils/GcloudWrapper/AppEngine.php
+++ b/src/TestUtils/GcloudWrapper/AppEngine.php
@@ -237,4 +237,5 @@ public function getBaseUrl($service = 'default')
     }
 }
 
+// @phpstan-ignore-next-line
 class_alias(AppEngine::class, \Google\Cloud\TestUtils\GcloudWrapper::class);
diff --git a/src/TestUtils/GcloudWrapper/CloudFunction.php b/src/TestUtils/GcloudWrapper/CloudFunction.php
index a6ca92e..07b05d3 100644
--- a/src/TestUtils/GcloudWrapper/CloudFunction.php
+++ b/src/TestUtils/GcloudWrapper/CloudFunction.php
@@ -108,7 +108,7 @@ public static function fromArray(array $arr)
             $args[] = $arr[$key] ?? '';
         }
 
-        return new static(...$args);
+        return new self(...$args);
     }
 
     /**
diff --git a/src/Utils/ContainerExec.php b/src/Utils/ContainerExec.php
index 9e6b95c..72f3875 100644
--- a/src/Utils/ContainerExec.php
+++ b/src/Utils/ContainerExec.php
@@ -62,7 +62,8 @@ public function __construct(
             throw new \InvalidArgumentException("$workdir is not a directory");
         }
         $this->gcloud = ($gcloud == null) ? new Gcloud() : $gcloud;
-        if (class_exists(\Twig_Loader_Filesystem::class)) {
+        if (class_exists(\Twig_Loader_Filesystem::class)
+            && class_exists(\Twig_Environment::class)) {
             $loader = new \Twig_Loader_Filesystem(__DIR__ . '/templates');
             $this->twig = new \Twig_Environment($loader);
         } else {
diff --git a/src/Utils/Flex/FlexExecCommand.php b/src/Utils/Flex/FlexExecCommand.php
index d60a60e..ea354c4 100644
--- a/src/Utils/Flex/FlexExecCommand.php
+++ b/src/Utils/Flex/FlexExecCommand.php
@@ -244,7 +244,7 @@ protected function resolveImage(
      * @param string $service
      * @param InputInterface $input
      * @param OutputInterface $output
-     * @return string The version for the latest deployment for the given
+     * @return ?string The version for the latest deployment for the given
      *         service.
      */
     protected function detectLatestDeployedVersion(
diff --git a/src/Utils/WordPress/Project.php b/src/Utils/WordPress/Project.php
index 4c418e5..2004c21 100644
--- a/src/Utils/WordPress/Project.php
+++ b/src/Utils/WordPress/Project.php
@@ -41,6 +41,7 @@ class Project extends BaseProject
     private $input;
     private $output;
     private $helper;
+    private $filesystem;
     private $wordPressDir;
 
     public function __construct(InputInterface $input, OutputInterface $output, QuestionHelper $helper = null)