diff --git a/php/examples/VaasExample/GetVerdictByFile.php b/php/examples/VaasExample/GetVerdictByFile.php
index 65362a03..47782e24 100644
--- a/php/examples/VaasExample/GetVerdictByFile.php
+++ b/php/examples/VaasExample/GetVerdictByFile.php
@@ -14,8 +14,8 @@
 );
 
 $vaas = (new Vaas())
-    ->WithAuthenticator($authenticator)
-    ->WithUrl(getenv("VAAS_URL") ?? "wss://gateway.production.vaas.gdatasecurity.de")
+    ->withAuthenticator($authenticator)
+    ->withUrl(getenv("VAAS_URL") ?? "wss://gateway.production.vaas.gdatasecurity.de")
     ->build();
 
 $scanPath = getenv("SCAN_PATH");
diff --git a/php/examples/VaasExample/GetVerdictByHash.php b/php/examples/VaasExample/GetVerdictByHash.php
index 627f5703..097de49f 100644
--- a/php/examples/VaasExample/GetVerdictByHash.php
+++ b/php/examples/VaasExample/GetVerdictByHash.php
@@ -13,8 +13,8 @@
     getenv("TOKEN_URL") ?: "https://account.gdata.de/realms/vaas-production/protocol/openid-connect/token"
 );
 $vaas = (new Vaas())
-    ->WithAuthenticator($authenticator)
-    ->WithUrl(getenv("VAAS_URL") ?? "wss://gateway.production.vaas.gdatasecurity.de")
+    ->withAuthenticator($authenticator)
+    ->withUrl(getenv("VAAS_URL") ?? "wss://gateway.production.vaas.gdatasecurity.de")
     ->build();
 
 // EICAR
diff --git a/php/examples/VaasExample/GetVerdictByUrl.php b/php/examples/VaasExample/GetVerdictByUrl.php
index a0a76899..70757bf7 100644
--- a/php/examples/VaasExample/GetVerdictByUrl.php
+++ b/php/examples/VaasExample/GetVerdictByUrl.php
@@ -13,8 +13,8 @@
     getenv("TOKEN_URL") ?: "https://account.gdata.de/realms/vaas-production/protocol/openid-connect/token"
 );
 $vaas = (new Vaas())
-    ->WithAuthenticator($authenticator)
-    ->WithUrl(getenv("VAAS_URL") ?? "wss://gateway.production.vaas.gdatasecurity.de")
+    ->withAuthenticator($authenticator)
+    ->withUrl(getenv("VAAS_URL") ?? "wss://gateway.production.vaas.gdatasecurity.de")
     ->build();
 
 // EICAR
diff --git a/php/examples/wordpress/src/gd-scan/Vaas/Client.php b/php/examples/wordpress/src/gd-scan/Vaas/Client.php
index 3712880b..7266a3d5 100644
--- a/php/examples/wordpress/src/gd-scan/Vaas/Client.php
+++ b/php/examples/wordpress/src/gd-scan/Vaas/Client.php
@@ -17,7 +17,7 @@ public function __construct()
             getenv("TOKEN_URL") ?: "https://account.gdata.de/realms/vaas-production/protocol/openid-connect/token"
         );
         $this->vaas = (new Vaas())
-            ->WithAuthenticator($authenticator)
+            ->withAuthenticator($authenticator)
             ->build();
     }
 
diff --git a/php/src/vaas/Vaas.php b/php/src/vaas/Vaas.php
index c62bc51f..be5a458d 100644
--- a/php/src/vaas/Vaas.php
+++ b/php/src/vaas/Vaas.php
@@ -47,37 +47,37 @@ public function __destruct() {
         }
     }
 
-    public function WithOptions(VaasOptions $options): self
+    public function withOptions(VaasOptions $options): self
     {
         $this->options = $options;
         return $this;
     }
 
-    public function WithHtttpClient(HttpClient $httpClient): self
+    public function withHtttpClient(HttpClient $httpClient): self
     {
         $this->httpClient = $httpClient;
         return $this;
     }
 
-    public function WithAuthenticator(AuthenticatorInterface $authenticator): self
+    public function withAuthenticator(AuthenticatorInterface $authenticator): self
     {
         $this->authenticator = $authenticator;
         return $this;
     }
 
-    public function WithLogger(LoggerInterface $logger): self
+    public function withLogger(LoggerInterface $logger): self
     {
         $this->logger = $logger;
         return $this;
     }
 
-    public function WithUrl(string $vaasUrl): self
+    public function withUrl(string $vaasUrl): self
     {
         $this->vaasUrl = $vaasUrl;
         return $this;
     }
 
-    public function WithVaasConnection(VaasConnection $vaasConnection): self
+    public function withVaasConnection(VaasConnection $vaasConnection): self
     {
         $this->vaasConnection = $vaasConnection;
         return $this;
@@ -90,14 +90,14 @@ public function build(): self
         }
         if (!isset($this->vaasConnection) && isset($this->authenticator)) {
             $this->vaasConnection = (new VaasConnection())
-                ->WithAuthenticator($this->authenticator)
-                ->WithUrl($this->vaasUrl)
-                ->WithLogger($this->logger)
+                ->withAuthenticator($this->authenticator)
+                ->withUrl($this->vaasUrl)
+                ->withLogger($this->logger)
                 ->build();
         } else if (!isset($this->vaasConnection)) {
             $this->vaasConnection = (new VaasConnection())
-                ->WithUrl($this->vaasUrl)
-                ->WithLogger($this->logger)
+                ->withUrl($this->vaasUrl)
+                ->withLogger($this->logger)
                 ->build();    
         }
         if (!isset($this->options)) {
diff --git a/php/src/vaas/VaasConnection.php b/php/src/vaas/VaasConnection.php
index 8410e78e..91b5ba1c 100644
--- a/php/src/vaas/VaasConnection.php
+++ b/php/src/vaas/VaasConnection.php
@@ -54,27 +54,27 @@ public function close(): void {
         $this->loop->ignore();
     }
 
-    public function WithAuthenticator(AuthenticatorInterface $authenticator): VaasConnection {
+    public function withAuthenticator(AuthenticatorInterface $authenticator): VaasConnection {
         $this->authenticator = $authenticator;
         return $this;
     }
 
-    public function WithConnection(WebsocketConnection $WebSocketClient): VaasConnection {
+    public function withConnection(WebsocketConnection $WebSocketClient): VaasConnection {
         $this->WebSocketClient = $WebSocketClient;
         return $this;
     }
 
-    public function WithUrl(string $url): VaasConnection {
+    public function withUrl(string $url): VaasConnection {
         $this->url = $url;
         return $this;
     }
     
-    public function WithLogger(LoggerInterface $logger): VaasConnection {
+    public function withLogger(LoggerInterface $logger): VaasConnection {
         $this->logger = $logger;
         return $this;
     }
 
-    public function WithTimeout(int $timeoutInSeconds): VaasConnection {
+    public function withTimeout(int $timeoutInSeconds): VaasConnection {
         $this->waitTimeoutInSeconds = $timeoutInSeconds;
         return $this;
     }
diff --git a/php/tests/vaas/ProtocolTest.php b/php/tests/vaas/ProtocolTest.php
index 9a5fe53e..753aaa95 100644
--- a/php/tests/vaas/ProtocolTest.php
+++ b/php/tests/vaas/ProtocolTest.php
@@ -42,12 +42,12 @@ public function testConnectionGetsClosedAfterConnecting_ThrowsVaasConnectionClos
         $fakeWebsocket->method('receive')
             ->willReturn(WebsocketMessage::fromText('{"kind": "AuthResponse", "success": true, "session_id": "id"}'));
         $vaasConnection = (new VaasConnection())
-            ->WithConnection($fakeWebsocket)
+            ->withConnection($fakeWebsocket)
             ->build();
 
         $vaas = (new Vaas())
-            ->WithUrl("wws://url.de")
-            ->WithVaasConnection($vaasConnection)
+            ->withUrl("wws://url.de")
+            ->withVaasConnection($vaasConnection)
             ->build();
         $vaas->Connect("valid");
         $vaas->ForSha256("000005c43196142f01d615a67b7da8a53cb0172f8e9317a2ec9a0a39a1da6fe8");
@@ -64,12 +64,12 @@ public function testConnectionGetsClosedBeforeConnect_ThrowsVaasConnectionClosed
         $fakeWebsocket->method('receive')
             ->willReturn(WebsocketMessage::fromText('{"kind": "AuthResponse", "success": true, "session_id": "id"}'));
         $vaasConnection = (new VaasConnection())
-            ->WithConnection($fakeWebsocket)
+            ->withConnection($fakeWebsocket)
             ->build();
 
         $vaas = (new Vaas())
-            ->WithUrl("wws://url.de")
-            ->WithVaasConnection($vaasConnection)
+            ->withUrl("wws://url.de")
+            ->withVaasConnection($vaasConnection)
             ->build();
         $vaas->Connect("valid");
     }
diff --git a/php/tests/vaas/VaasTest.php b/php/tests/vaas/VaasTest.php
index ea224001..814b5386 100644
--- a/php/tests/vaas/VaasTest.php
+++ b/php/tests/vaas/VaasTest.php
@@ -80,9 +80,9 @@ public function setUp(): void
     private function _getVaas(bool $useCache = false, bool $useHashLookup = true, LoggerInterface $logger = null): Vaas
     {
         return (new Vaas())
-            ->WithUrl($_ENV["VAAS_URL"])
-            ->WithLogger($logger ?? $this->_getDebugLogger())
-            ->WithOptions(new VaasOptions($useCache, $useHashLookup))
+            ->withUrl($_ENV["VAAS_URL"])
+            ->withLogger($logger ?? $this->_getDebugLogger())
+            ->withOptions(new VaasOptions($useCache, $useHashLookup))
             ->build();
     }