diff --git a/composer.json b/composer.json
index 52d3859a2..32cfb9372 100644
--- a/composer.json
+++ b/composer.json
@@ -7,7 +7,7 @@
     "license": "BSD-3-Clause",
     "require": {
         "php": "^8.1",
-        "google/auth": "dev-http-logging as 1.3",
+        "google/auth": "^1.45",
         "google/grpc-gcp": "^0.4",
         "grpc/grpc": "^1.13",
         "google/protobuf": "^v3.25.3||^4.26.1",
diff --git a/src/BidiStream.php b/src/BidiStream.php
index 49867025a..e4d6718b2 100644
--- a/src/BidiStream.php
+++ b/src/BidiStream.php
@@ -172,12 +172,12 @@ public function read()
         if ($this->logger) {
             $responseEvent = new RpcLogEvent();
 
-            $responseEvent->headers = (is_null($result)) ? $this->call->getMetadata() : null;
-            $responseEvent->status = (is_null($result)) ? $status->code : null;
+            $responseEvent->headers = $this->call->getMetadata();
+            $responseEvent->status = $status->code ?? null;
             $responseEvent->processId = (int) getmypid();
             $responseEvent->requestId = crc32((string) spl_object_id($this) . getmypid());
 
-            if ($result && $result instanceof Message) {
+            if ($result instanceof Message) {
                 $responseEvent->payload = $result->serializeToJsonString();
             }
 
diff --git a/src/ClientOptionsTrait.php b/src/ClientOptionsTrait.php
index dfba2bada..62ea0ec36 100644
--- a/src/ClientOptionsTrait.php
+++ b/src/ClientOptionsTrait.php
@@ -129,11 +129,15 @@ private function buildClientOptions(array $options)
         $options += $defaultOptions;
 
         // If logger is explicitly set to false, logging is disabled
-        if ($options['logger'] !== false) {
-            $options['logger'] = $options['logger'] ?? ApplicationDefaultCredentials::getDefaultLogger();
+        if (is_null($options['logger'])) {
+            $options['logger'] = ApplicationDefaultCredentials::getDefaultLogger();
         }
 
-        if ($options['logger'] !== null && $options['logger'] !== false && !$options['logger'] instanceof LoggerInterface) {
+        if (
+            $options['logger'] !== null
+            && $options['logger'] !== false
+            && !$options['logger'] instanceof LoggerInterface
+        ) {
             throw new ValidationException(
                 'The "logger" option in the options array should be PSR-3 LoggerInterface compatible'
             );
@@ -143,7 +147,9 @@ private function buildClientOptions(array $options)
         $this->logConfiguration($options['logger'], $clientSuppliedOptions);
 
         if (isset($options['logger'])) {
-            $options['credentialsConfig']['authHttpHandler'] = HttpHandlerFactory::build(logger: $options['logger']);
+            $options['credentialsConfig']['authHttpHandler'] = HttpHandlerFactory::build(
+                logger: $options['logger']
+            );
         }
 
         $options['credentialsConfig'] += $defaultOptions['credentialsConfig'];
diff --git a/src/ClientStream.php b/src/ClientStream.php
index 5fa5236a5..6c249551c 100644
--- a/src/ClientStream.php
+++ b/src/ClientStream.php
@@ -71,6 +71,7 @@ public function __construct(// @phpstan-ignore-line
      */
     public function write($request)
     {
+        // In some cases, $request can be a string
         if ($this->logger && $request instanceof Message) {
             $requestEvent = new RpcLogEvent();
 
@@ -102,7 +103,7 @@ public function readResponse()
                 $responseEvent->processId = (int) getmypid();
                 $responseEvent->requestId = crc32((string) spl_object_id($this) . getmypid());
 
-                if ($response && $response instanceof Message) {
+                if ($response instanceof Message) {
                     $response->serializeToJsonString();
                 }
 
diff --git a/src/Transport/GrpcFallbackTransport.php b/src/Transport/GrpcFallbackTransport.php
index 7b2e417be..b248b052e 100644
--- a/src/Transport/GrpcFallbackTransport.php
+++ b/src/Transport/GrpcFallbackTransport.php
@@ -87,9 +87,10 @@ public static function build(string $apiEndpoint, array $config = [])
         $config += [
             'httpHandler'  => null,
             'clientCertSource' => null,
+            'logger' => null,
         ];
         list($baseUri, $port) = self::normalizeServiceAddress($apiEndpoint);
-        $httpHandler = $config['httpHandler'] ?: self::buildHttpHandlerAsync(logger: $config['logger'] ?? null);
+        $httpHandler = $config['httpHandler'] ?: self::buildHttpHandlerAsync(logger: $config['logger']);
         $transport = new GrpcFallbackTransport("$baseUri:$port", $httpHandler);
         if ($config['clientCertSource']) {
             $transport->configureMtlsChannel($config['clientCertSource']);
diff --git a/src/Transport/GrpcTransport.php b/src/Transport/GrpcTransport.php
index c5ab936be..ebcbc07b2 100644
--- a/src/Transport/GrpcTransport.php
+++ b/src/Transport/GrpcTransport.php
@@ -135,6 +135,7 @@ public static function build(string $apiEndpoint, array $config = [])
             'channel'          => null,
             'interceptors'     => [],
             'clientCertSource' => null,
+            'logger'           => null,
         ];
         list($addr, $port) = self::normalizeServiceAddress($apiEndpoint);
         $host = "$addr:$port";
@@ -157,10 +158,10 @@ public static function build(string $apiEndpoint, array $config = [])
             );
         }
         try {
-            if (isset($config['logger']) && $config['logger'] === false) {
+            if ($config['logger'] === false) {
                 $config['logger'] = null;
             }
-            return new GrpcTransport($host, $stubOpts, $channel, $config['interceptors'], $config['logger'] ?? null);
+            return new GrpcTransport($host, $stubOpts, $channel, $config['interceptors'], $config['logger']);
         } catch (Exception $ex) {
             throw new ValidationException(
                 'Failed to build GrpcTransport: ' . $ex->getMessage(),
diff --git a/src/Transport/HttpUnaryTransportTrait.php b/src/Transport/HttpUnaryTransportTrait.php
index d2cccd11e..38c4ca1f5 100644
--- a/src/Transport/HttpUnaryTransportTrait.php
+++ b/src/Transport/HttpUnaryTransportTrait.php
@@ -130,7 +130,7 @@ private static function buildCommonHeaders(array $options)
     private static function buildHttpHandlerAsync(null|false|LoggerInterface $logger = null)
     {
         try {
-            return [HttpHandlerFactory::build(null, $logger), 'async'];
+            return [HttpHandlerFactory::build(logger: $logger), 'async'];
         } catch (Exception $ex) {
             throw new ValidationException('Failed to build HttpHandler', $ex->getCode(), $ex);
         }
diff --git a/src/Transport/RestTransport.php b/src/Transport/RestTransport.php
index 871fbdb41..296937fa4 100644
--- a/src/Transport/RestTransport.php
+++ b/src/Transport/RestTransport.php
@@ -95,12 +95,13 @@ public static function build(string $apiEndpoint, string $restConfigPath, array
             'httpHandler'  => null,
             'clientCertSource' => null,
             'hasEmulator' => false,
+            'logger' => null,
         ];
         list($baseUri, $port) = self::normalizeServiceAddress($apiEndpoint);
         $requestBuilder = $config['hasEmulator']
             ? new InsecureRequestBuilder("$baseUri:$port", $restConfigPath)
             : new RequestBuilder("$baseUri:$port", $restConfigPath);
-        $httpHandler = $config['httpHandler'] ?: self::buildHttpHandlerAsync($config['logger'] ?? null);
+        $httpHandler = $config['httpHandler'] ?: self::buildHttpHandlerAsync($config['logger']);
         $transport = new RestTransport($requestBuilder, $httpHandler);
         if ($config['clientCertSource']) {
             $transport->configureMtlsChannel($config['clientCertSource']);
diff --git a/tests/Unit/Middleware/RetryMiddlewareTest.php b/tests/Unit/Middleware/RetryMiddlewareTest.php
index a59b74eef..256f91fa9 100644
--- a/tests/Unit/Middleware/RetryMiddlewareTest.php
+++ b/tests/Unit/Middleware/RetryMiddlewareTest.php
@@ -387,9 +387,7 @@ public function testMaxRetries()
 
     public function testRetriesAreIncludedInTheOptionsArray()
     {
-        $call = $this->getMockBuilder(Call::class)
-            ->disableOriginalConstructor()
-            ->getMock();
+        $call = $this->prophesize(Call::class)->reveal();
 
         $maxRetries = 1;
         $reportedRetries = 0;
@@ -528,31 +526,4 @@ public function testUnlimitedMaxRetries()
 
         $middleware($call->reveal(), [])->wait();
     }
-}
-
-class MockHandler implements MiddlewareInterface
-{
-    public int $calls;
-    public bool $containsRetries = false;
-
-    public function __construct()
-    {
-        $this->calls = 0;
-    }
-
-    public function __invoke(Call $call, array $options)
-    {
-        $promise =  new Promise();
-
-        if ($this->calls === 0) {
-            $this->calls += 1;
-            return $promise->reject();
-        }
-
-        if (array_key_exists('retryAttempt') && $options['retryAttempt'] === 1) {
-            $this->containsRetries = true;
-        }
-
-        return $promise->resolve();
-    }
 }
\ No newline at end of file
diff --git a/tests/Unit/Transport/GrpcTransportTest.php b/tests/Unit/Transport/GrpcTransportTest.php
index 829334d85..580ba9a76 100644
--- a/tests/Unit/Transport/GrpcTransportTest.php
+++ b/tests/Unit/Transport/GrpcTransportTest.php
@@ -439,17 +439,6 @@ public function testClientCertSourceOptionInvalid()
         );
     }
 
-    // public function testLoggerGetsCalledIfLoggerSupplied()
-    // {
-    //     // $logger = $this->prophesize(StdOutLogger::class);
-    //     // $logger->debug(Argument::cetera())
-    //     //     ->shouldBeCalledTimes(2);
-    //     // $logger->info(Argument::cetera())
-    //     //     ->shouldBeCalledTimes(1);
-    //     // $logger->log(Argument::cetera())
-    //     //     ->shouldBeCalled();
-    // }
-
     /**
      * @dataProvider buildDataGrpc
      */