diff --git a/Makefile b/Makefile
index 47b081981..82821c6df 100644
--- a/Makefile
+++ b/Makefile
@@ -25,7 +25,7 @@ trace examples: FORCE
 	docker-compose stop
 collector:
 	docker-compose -f docker-compose-collector.yaml up -d --remove-orphans
-	docker-compose -f docker-compose-collector.yaml run -e OTEL_EXPORTER_OTLP_ENDPOINT=otel-collector:4317 --rm php php ./examples/AlwaysOnOTLPGrpcExample2.php
+	docker-compose -f docker-compose-collector.yaml run -e OTEL_EXPORTER_OTLP_ENDPOINT=otel-collector:4318 --rm php php ./examples/AlwaysOnOTLPGrpcExample2.php
 	docker-compose -f docker-compose-collector.yaml stop
 
 metrics-prometheus-example:
diff --git a/contrib/OtlpGrpc/Exporter.php b/contrib/OtlpGrpc/Exporter.php
index 6d3857d71..a4228f1f2 100644
--- a/contrib/OtlpGrpc/Exporter.php
+++ b/contrib/OtlpGrpc/Exporter.php
@@ -69,7 +69,7 @@ class Exporter implements Trace\Exporter
      * OTLP GRPC Exporter Constructor
      */
     public function __construct(
-        string $endpointURL = 'localhost:4317',
+        string $endpointURL = 'localhost:4318',
         bool $insecure = true,
         string $certificateFile = '',
         string $headers = '',
diff --git a/docker-compose-collector.yaml b/docker-compose-collector.yaml
index 74ce4266f..a44591e39 100644
--- a/docker-compose-collector.yaml
+++ b/docker-compose-collector.yaml
@@ -31,6 +31,6 @@ services:
       - "8889:8889"   # Prometheus exporter metrics
       - "13133:13133" # health_check extension
       - "9411"   # Zipkin receiver
-      - "4317:4317"        # OTLP gRPC receiver
+      - "4318:4318"        # OTLP gRPC receiver
       - "55681:55681" # Legacy OTLP/HTTP Port
       - "55680:55679" # zpages extension
diff --git a/tests/Contrib/Unit/OTLPGrpcExporterTest.php b/tests/Contrib/Unit/OTLPGrpcExporterTest.php
index 905b418d8..bf5919cb4 100644
--- a/tests/Contrib/Unit/OTLPGrpcExporterTest.php
+++ b/tests/Contrib/Unit/OTLPGrpcExporterTest.php
@@ -43,7 +43,7 @@ public function testExporter()
 
     public function testRefusesInvalidHeaders()
     {
-        $foo = new Exporter('localhost:4317', true, '', 'a:bc');
+        $foo = new Exporter('localhost:4318', true, '', 'a:bc');
 
         $this->assertEquals([], $foo->getHeaders());
 
@@ -63,7 +63,7 @@ public function testSetHeadersWithEnvironmentVariables()
 
     public function testSetHeadersInConstructor()
     {
-        $exporter = new Exporter('localhost:4317', true, '', 'x-aaa=foo,x-bbb=bar');
+        $exporter = new Exporter('localhost:4318', true, '', 'x-aaa=foo,x-bbb=bar');
 
         $this->assertEquals(['x-aaa' => ['foo'], 'x-bbb' => ['bar']], $exporter->getHeaders());
 
@@ -126,13 +126,13 @@ private function isInsecure(Exporter $exporter) : bool
     public function testClientOptions()
     {
         // default options
-        $exporter = new Exporter('localhost:4317');
+        $exporter = new Exporter('localhost:4318');
         $opts = $exporter->getClientOptions();
         $this->assertEquals(10, $opts['timeout']);
         $this->assertTrue($this->isInsecure($exporter));
         $this->assertFalse(array_key_exists('grpc.default_compression_algorithm', $opts));
         // method args
-        $exporter = new Exporter('localhost:4317', false, '', '', true, 5);
+        $exporter = new Exporter('localhost:4318', false, '', '', true, 5);
         $opts = $exporter->getClientOptions();
         $this->assertEquals(5, $opts['timeout']);
         $this->assertFalse($this->isInsecure($exporter));
@@ -141,7 +141,7 @@ public function testClientOptions()
         putenv('OTEL_EXPORTER_OTLP_TIMEOUT=1');
         putenv('OTEL_EXPORTER_OTLP_COMPRESSION=1');
         putenv('OTEL_EXPORTER_OTLP_INSECURE=false');
-        $exporter = new Exporter('localhost:4317');
+        $exporter = new Exporter('localhost:4318');
         $opts = $exporter->getClientOptions();
         $this->assertEquals(1, $opts['timeout']);
         $this->assertFalse($this->isInsecure($exporter));
diff --git a/tests/Contrib/Unit/OTLPHttpExporterTest.php b/tests/Contrib/Unit/OTLPHttpExporterTest.php
index 8cfe8c64f..678bad146 100644
--- a/tests/Contrib/Unit/OTLPHttpExporterTest.php
+++ b/tests/Contrib/Unit/OTLPHttpExporterTest.php
@@ -187,7 +187,7 @@ public function exporterEndpointDataProvider()
     {
         return [
             'Default Endpoint' => ['', 'https://localhost:55681/v1/traces'],
-            'Custom Endpoint' => ['https://otel-collector:4317/custom/path', 'https://otel-collector:4317/custom/path'],
+            'Custom Endpoint' => ['https://otel-collector:4318/custom/path', 'https://otel-collector:4318/custom/path'],
             'Insecure Endpoint' => ['http://api.example.com:80/v1/traces', 'http://api.example.com/v1/traces'],
             //'Without Path' => ['https://api.example.com', 'https://api.example.com/v1/traces'] # TODO: Support a default path of /v1/traces
         ];