diff --git a/pubsub/api/src/update_topic_type.php b/pubsub/api/src/update_topic_type.php
new file mode 100644
index 0000000000..8d179a719c
--- /dev/null
+++ b/pubsub/api/src/update_topic_type.php
@@ -0,0 +1,73 @@
+<?php
+
+/**
+ * Copyright 2025 Google LLC.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+/**
+ * For instructions on how to run the full sample:
+ *
+ * @see https://github.com/GoogleCloudPlatform/php-docs-samples/blob/main/pubsub/api/README.md
+ */
+
+namespace Google\Cloud\Samples\PubSub;
+
+# [START pubsub_update_topic_type]
+use Google\Cloud\PubSub\PubSubClient;
+
+/**
+ * Changes the type of a Pub/Sub topic.
+ *
+ * @param string $projectId  The Google project ID.
+ * @param string $topicName  The Pub/Sub topic name.
+ * @param string $streamArn  The Kinesis stream ARN to ingest data from.
+ * @param string $consumerArn  The Kinesis consumer ARN to used for ingestion in Enhanced Fan-Out mode. The consumer must be already created and ready to be used.
+ * @param string $awsRoleArn  AWS role ARN to be used for Federated Identity authentication with Kinesis. Check the Pub/Sub docs for how to set up this role and the required permissions that need to be attached to it.
+ * @param string $gcpServiceAccount  The GCP service account to be used for Federated Identity authentication with Kinesis (via a AssumeRoleWithWebIdentity call for the provided role). The $awsRoleArn must be set up with accounts.google.com:sub equals to this service account number.
+ */
+function update_topic_type(
+    string $projectId,
+    string $topicName,
+    string $streamArn,
+    string $consumerArn,
+    string $awsRoleArn,
+    string $gcpServiceAccount
+): void {
+    $pubsub = new PubSubClient([
+        'projectId' => $projectId,
+    ]);
+
+    $topic = $pubsub->topic($topicName);
+
+    $topic->update([
+        'ingestionDataSourceSettings' => [
+            'aws_kinesis' => [
+                'stream_arn' => $streamArn,
+                'consumer_arn' => $consumerArn,
+                'aws_role_arn' => $awsRoleArn,
+                'gcp_service_account' => $gcpServiceAccount
+            ]
+        ]
+    ], [
+        'updateMask' => [
+            'ingestionDataSourceSettings'
+        ]
+    ]);
+
+    printf('Topic updated: %s' . PHP_EOL, $topic->name());
+}
+# [END pubsub_update_topic_type]
+require_once __DIR__ . '/../../../testing/sample_helpers.php';
+\Google\Cloud\Samples\execute_sample(__FILE__, __NAMESPACE__, $argv);
diff --git a/pubsub/api/test/pubsubTest.php b/pubsub/api/test/pubsubTest.php
index 5cf0e45b2f..cb3375a396 100644
--- a/pubsub/api/test/pubsubTest.php
+++ b/pubsub/api/test/pubsubTest.php
@@ -600,4 +600,28 @@ public function testOptimisticSubscribe()
         $this->assertMatchesRegularExpression('/Subscription deleted:/', $output);
         $this->assertMatchesRegularExpression(sprintf('/%s/', $subcriptionId), $output);
     }
+
+    public function testUpdateTopicType()
+    {
+        $topic = 'test-topic-' . rand();
+        $output = $this->runFunctionSnippet('create_topic', [
+            self::$projectId,
+            $topic,
+        ]);
+
+        $this->assertMatchesRegularExpression('/Topic created:/', $output);
+        $this->assertMatchesRegularExpression(sprintf('/%s/', $topic), $output);
+
+        $output = $this->runFunctionSnippet('update_topic_type', [
+            self::$projectId,
+            $topic,
+            'arn:aws:kinesis:us-west-2:111111111111:stream/fake-stream-name',
+            'arn:aws:kinesis:us-west-2:111111111111:stream/fake-stream-name/consumer/consumer-1:1111111111',
+            self::$awsRoleArn,
+            self::$gcpServiceAccount
+        ]);
+
+        $this->assertMatchesRegularExpression('/Topic updated:/', $output);
+        $this->assertMatchesRegularExpression(sprintf('/%s/', $topic), $output);
+    }
 }