diff --git a/manifest.json b/manifest.json
index 6afc77c36..f5271a909 100644
--- a/manifest.json
+++ b/manifest.json
@@ -1,6 +1,6 @@
 {
     "variables": {
-        "${LATEST}": "3.356.12"
+        "${LATEST}": "3.356.13"
     },
     "endpoints": "https://raw.githubusercontent.com/aws/aws-sdk-php/${LATEST}/src/data/endpoints.json",
     "services": {
diff --git a/src/Service/S3/CHANGELOG.md b/src/Service/S3/CHANGELOG.md
index 952f1e353..ece631373 100644
--- a/src/Service/S3/CHANGELOG.md
+++ b/src/Service/S3/CHANGELOG.md
@@ -2,6 +2,10 @@
 
 ## NOT RELEASED
 
+### BC-BREAK
+
+- AWS api-change: Expires's property and its getters/setters switched from `\DateTimeImmutable` to `string`.
+
 ## 2.10.0
 
 ### Added
diff --git a/src/Service/S3/composer.json b/src/Service/S3/composer.json
index b27cb3fee..8b5e5c4c0 100644
--- a/src/Service/S3/composer.json
+++ b/src/Service/S3/composer.json
@@ -30,7 +30,7 @@
     },
     "extra": {
         "branch-alias": {
-            "dev-master": "2.10-dev"
+            "dev-master": "3.0-dev"
         }
     }
 }
diff --git a/src/Service/S3/src/Input/CopyObjectRequest.php b/src/Service/S3/src/Input/CopyObjectRequest.php
index 8c562338a..49f26dad5 100644
--- a/src/Service/S3/src/Input/CopyObjectRequest.php
+++ b/src/Service/S3/src/Input/CopyObjectRequest.php
@@ -256,7 +256,7 @@ final class CopyObjectRequest extends Input
     /**
      * The date and time at which the object is no longer cacheable.
      *
-     * @var \DateTimeImmutable|null
+     * @var string|null
      */
     private $expires;
 
@@ -713,7 +713,7 @@ final class CopyObjectRequest extends Input
      *   CopySourceIfModifiedSince?: null|\DateTimeImmutable|string,
      *   CopySourceIfNoneMatch?: null|string,
      *   CopySourceIfUnmodifiedSince?: null|\DateTimeImmutable|string,
-     *   Expires?: null|\DateTimeImmutable|string,
+     *   Expires?: null|string,
      *   GrantFullControl?: null|string,
      *   GrantRead?: null|string,
      *   GrantReadACP?: null|string,
@@ -759,7 +759,7 @@ public function __construct(array $input = [])
         $this->copySourceIfModifiedSince = !isset($input['CopySourceIfModifiedSince']) ? null : ($input['CopySourceIfModifiedSince'] instanceof \DateTimeImmutable ? $input['CopySourceIfModifiedSince'] : new \DateTimeImmutable($input['CopySourceIfModifiedSince']));
         $this->copySourceIfNoneMatch = $input['CopySourceIfNoneMatch'] ?? null;
         $this->copySourceIfUnmodifiedSince = !isset($input['CopySourceIfUnmodifiedSince']) ? null : ($input['CopySourceIfUnmodifiedSince'] instanceof \DateTimeImmutable ? $input['CopySourceIfUnmodifiedSince'] : new \DateTimeImmutable($input['CopySourceIfUnmodifiedSince']));
-        $this->expires = !isset($input['Expires']) ? null : ($input['Expires'] instanceof \DateTimeImmutable ? $input['Expires'] : new \DateTimeImmutable($input['Expires']));
+        $this->expires = $input['Expires'] ?? null;
         $this->grantFullControl = $input['GrantFullControl'] ?? null;
         $this->grantRead = $input['GrantRead'] ?? null;
         $this->grantReadAcp = $input['GrantReadACP'] ?? null;
@@ -805,7 +805,7 @@ public function __construct(array $input = [])
      *   CopySourceIfModifiedSince?: null|\DateTimeImmutable|string,
      *   CopySourceIfNoneMatch?: null|string,
      *   CopySourceIfUnmodifiedSince?: null|\DateTimeImmutable|string,
-     *   Expires?: null|\DateTimeImmutable|string,
+     *   Expires?: null|string,
      *   GrantFullControl?: null|string,
      *   GrantRead?: null|string,
      *   GrantReadACP?: null|string,
@@ -942,7 +942,7 @@ public function getExpectedSourceBucketOwner(): ?string
         return $this->expectedSourceBucketOwner;
     }
 
-    public function getExpires(): ?\DateTimeImmutable
+    public function getExpires(): ?string
     {
         return $this->expires;
     }
@@ -1127,7 +1127,7 @@ public function request(): Request
             $headers['x-amz-copy-source-if-unmodified-since'] = $this->copySourceIfUnmodifiedSince->setTimezone(new \DateTimeZone('GMT'))->format(\DateTimeInterface::RFC7231);
         }
         if (null !== $this->expires) {
-            $headers['Expires'] = $this->expires->setTimezone(new \DateTimeZone('GMT'))->format(\DateTimeInterface::RFC7231);
+            $headers['Expires'] = $this->expires;
         }
         if (null !== $this->grantFullControl) {
             $headers['x-amz-grant-full-control'] = $this->grantFullControl;
@@ -1392,7 +1392,7 @@ public function setExpectedSourceBucketOwner(?string $value): self
         return $this;
     }
 
-    public function setExpires(?\DateTimeImmutable $value): self
+    public function setExpires(?string $value): self
     {
         $this->expires = $value;
 
diff --git a/src/Service/S3/src/Input/CreateMultipartUploadRequest.php b/src/Service/S3/src/Input/CreateMultipartUploadRequest.php
index c1515758a..bf4cb3817 100644
--- a/src/Service/S3/src/Input/CreateMultipartUploadRequest.php
+++ b/src/Service/S3/src/Input/CreateMultipartUploadRequest.php
@@ -116,7 +116,7 @@ final class CreateMultipartUploadRequest extends Input
     /**
      * The date and time at which the object is no longer cacheable.
      *
-     * @var \DateTimeImmutable|null
+     * @var string|null
      */
     private $expires;
 
@@ -552,7 +552,7 @@ final class CreateMultipartUploadRequest extends Input
      *   ContentEncoding?: null|string,
      *   ContentLanguage?: null|string,
      *   ContentType?: null|string,
-     *   Expires?: null|\DateTimeImmutable|string,
+     *   Expires?: null|string,
      *   GrantFullControl?: null|string,
      *   GrantRead?: null|string,
      *   GrantReadACP?: null|string,
@@ -588,7 +588,7 @@ public function __construct(array $input = [])
         $this->contentEncoding = $input['ContentEncoding'] ?? null;
         $this->contentLanguage = $input['ContentLanguage'] ?? null;
         $this->contentType = $input['ContentType'] ?? null;
-        $this->expires = !isset($input['Expires']) ? null : ($input['Expires'] instanceof \DateTimeImmutable ? $input['Expires'] : new \DateTimeImmutable($input['Expires']));
+        $this->expires = $input['Expires'] ?? null;
         $this->grantFullControl = $input['GrantFullControl'] ?? null;
         $this->grantRead = $input['GrantRead'] ?? null;
         $this->grantReadAcp = $input['GrantReadACP'] ?? null;
@@ -624,7 +624,7 @@ public function __construct(array $input = [])
      *   ContentEncoding?: null|string,
      *   ContentLanguage?: null|string,
      *   ContentType?: null|string,
-     *   Expires?: null|\DateTimeImmutable|string,
+     *   Expires?: null|string,
      *   GrantFullControl?: null|string,
      *   GrantRead?: null|string,
      *   GrantReadACP?: null|string,
@@ -720,7 +720,7 @@ public function getExpectedBucketOwner(): ?string
         return $this->expectedBucketOwner;
     }
 
-    public function getExpires(): ?\DateTimeImmutable
+    public function getExpires(): ?string
     {
         return $this->expires;
     }
@@ -867,7 +867,7 @@ public function request(): Request
             $headers['Content-Type'] = $this->contentType;
         }
         if (null !== $this->expires) {
-            $headers['Expires'] = $this->expires->setTimezone(new \DateTimeZone('GMT'))->format(\DateTimeInterface::RFC7231);
+            $headers['Expires'] = $this->expires;
         }
         if (null !== $this->grantFullControl) {
             $headers['x-amz-grant-full-control'] = $this->grantFullControl;
@@ -1067,7 +1067,7 @@ public function setExpectedBucketOwner(?string $value): self
         return $this;
     }
 
-    public function setExpires(?\DateTimeImmutable $value): self
+    public function setExpires(?string $value): self
     {
         $this->expires = $value;
 
diff --git a/src/Service/S3/src/Input/PutObjectRequest.php b/src/Service/S3/src/Input/PutObjectRequest.php
index b22553458..f209f97ea 100644
--- a/src/Service/S3/src/Input/PutObjectRequest.php
+++ b/src/Service/S3/src/Input/PutObjectRequest.php
@@ -261,7 +261,7 @@ final class PutObjectRequest extends Input
      *
      * [^1]: https://www.rfc-editor.org/rfc/rfc7234#section-5.3
      *
-     * @var \DateTimeImmutable|null
+     * @var string|null
      */
     private $expires;
 
@@ -633,7 +633,7 @@ final class PutObjectRequest extends Input
      *   ChecksumCRC64NVME?: null|string,
      *   ChecksumSHA1?: null|string,
      *   ChecksumSHA256?: null|string,
-     *   Expires?: null|\DateTimeImmutable|string,
+     *   Expires?: null|string,
      *   IfMatch?: null|string,
      *   IfNoneMatch?: null|string,
      *   GrantFullControl?: null|string,
@@ -679,7 +679,7 @@ public function __construct(array $input = [])
         $this->checksumCrc64Nvme = $input['ChecksumCRC64NVME'] ?? null;
         $this->checksumSha1 = $input['ChecksumSHA1'] ?? null;
         $this->checksumSha256 = $input['ChecksumSHA256'] ?? null;
-        $this->expires = !isset($input['Expires']) ? null : ($input['Expires'] instanceof \DateTimeImmutable ? $input['Expires'] : new \DateTimeImmutable($input['Expires']));
+        $this->expires = $input['Expires'] ?? null;
         $this->ifMatch = $input['IfMatch'] ?? null;
         $this->ifNoneMatch = $input['IfNoneMatch'] ?? null;
         $this->grantFullControl = $input['GrantFullControl'] ?? null;
@@ -725,7 +725,7 @@ public function __construct(array $input = [])
      *   ChecksumCRC64NVME?: null|string,
      *   ChecksumSHA1?: null|string,
      *   ChecksumSHA256?: null|string,
-     *   Expires?: null|\DateTimeImmutable|string,
+     *   Expires?: null|string,
      *   IfMatch?: null|string,
      *   IfNoneMatch?: null|string,
      *   GrantFullControl?: null|string,
@@ -857,7 +857,7 @@ public function getExpectedBucketOwner(): ?string
         return $this->expectedBucketOwner;
     }
 
-    public function getExpires(): ?\DateTimeImmutable
+    public function getExpires(): ?string
     {
         return $this->expires;
     }
@@ -1046,7 +1046,7 @@ public function request(): Request
             $headers['x-amz-checksum-sha256'] = $this->checksumSha256;
         }
         if (null !== $this->expires) {
-            $headers['Expires'] = $this->expires->setTimezone(new \DateTimeZone('GMT'))->format(\DateTimeInterface::RFC7231);
+            $headers['Expires'] = $this->expires;
         }
         if (null !== $this->ifMatch) {
             $headers['If-Match'] = $this->ifMatch;
@@ -1292,7 +1292,7 @@ public function setExpectedBucketOwner(?string $value): self
         return $this;
     }
 
-    public function setExpires(?\DateTimeImmutable $value): self
+    public function setExpires(?string $value): self
     {
         $this->expires = $value;
 
diff --git a/src/Service/S3/src/Result/GetObjectOutput.php b/src/Service/S3/src/Result/GetObjectOutput.php
index e67bec3a0..f24b57a1a 100644
--- a/src/Service/S3/src/Result/GetObjectOutput.php
+++ b/src/Service/S3/src/Result/GetObjectOutput.php
@@ -222,7 +222,7 @@ class GetObjectOutput extends Result
     /**
      * The date and time at which the object is no longer cacheable.
      *
-     * @var \DateTimeImmutable|null
+     * @var string|null
      */
     private $expires;
 
@@ -499,7 +499,7 @@ public function getExpiration(): ?string
         return $this->expiration;
     }
 
-    public function getExpires(): ?\DateTimeImmutable
+    public function getExpires(): ?string
     {
         $this->initialize();
 
@@ -678,7 +678,7 @@ protected function populateResult(Response $response): void
         $this->contentLanguage = $headers['content-language'][0] ?? null;
         $this->contentRange = $headers['content-range'][0] ?? null;
         $this->contentType = $headers['content-type'][0] ?? null;
-        $this->expires = isset($headers['expires'][0]) ? new \DateTimeImmutable($headers['expires'][0]) : null;
+        $this->expires = $headers['expires'][0] ?? null;
         $this->websiteRedirectLocation = $headers['x-amz-website-redirect-location'][0] ?? null;
         $this->serverSideEncryption = $headers['x-amz-server-side-encryption'][0] ?? null;
         $this->sseCustomerAlgorithm = $headers['x-amz-server-side-encryption-customer-algorithm'][0] ?? null;
diff --git a/src/Service/S3/src/Result/HeadObjectOutput.php b/src/Service/S3/src/Result/HeadObjectOutput.php
index 9d1f6d585..50fe19c61 100644
--- a/src/Service/S3/src/Result/HeadObjectOutput.php
+++ b/src/Service/S3/src/Result/HeadObjectOutput.php
@@ -241,7 +241,7 @@ class HeadObjectOutput extends Result
     /**
      * The date and time at which the object is no longer cacheable.
      *
-     * @var \DateTimeImmutable|null
+     * @var string|null
      */
     private $expires;
 
@@ -556,7 +556,7 @@ public function getExpiration(): ?string
         return $this->expiration;
     }
 
-    public function getExpires(): ?\DateTimeImmutable
+    public function getExpires(): ?string
     {
         $this->initialize();
 
@@ -736,7 +736,7 @@ protected function populateResult(Response $response): void
         $this->contentLanguage = $headers['content-language'][0] ?? null;
         $this->contentType = $headers['content-type'][0] ?? null;
         $this->contentRange = $headers['content-range'][0] ?? null;
-        $this->expires = isset($headers['expires'][0]) ? new \DateTimeImmutable($headers['expires'][0]) : null;
+        $this->expires = $headers['expires'][0] ?? null;
         $this->websiteRedirectLocation = $headers['x-amz-website-redirect-location'][0] ?? null;
         $this->serverSideEncryption = $headers['x-amz-server-side-encryption'][0] ?? null;
         $this->sseCustomerAlgorithm = $headers['x-amz-server-side-encryption-customer-algorithm'][0] ?? null;
diff --git a/src/Service/S3/src/S3Client.php b/src/Service/S3/src/S3Client.php
index a931dc6e9..f99dca984 100644
--- a/src/Service/S3/src/S3Client.php
+++ b/src/Service/S3/src/S3Client.php
@@ -530,7 +530,7 @@ public function completeMultipartUpload($input): CompleteMultipartUploadOutput
      *   CopySourceIfModifiedSince?: null|\DateTimeImmutable|string,
      *   CopySourceIfNoneMatch?: null|string,
      *   CopySourceIfUnmodifiedSince?: null|\DateTimeImmutable|string,
-     *   Expires?: null|\DateTimeImmutable|string,
+     *   Expires?: null|string,
      *   GrantFullControl?: null|string,
      *   GrantRead?: null|string,
      *   GrantReadACP?: null|string,
@@ -913,7 +913,7 @@ public function createBucket($input): CreateBucketOutput
      *   ContentEncoding?: null|string,
      *   ContentLanguage?: null|string,
      *   ContentType?: null|string,
-     *   Expires?: null|\DateTimeImmutable|string,
+     *   Expires?: null|string,
      *   GrantFullControl?: null|string,
      *   GrantRead?: null|string,
      *   GrantReadACP?: null|string,
@@ -2627,7 +2627,7 @@ public function putBucketTagging($input): Result
      *   ChecksumCRC64NVME?: null|string,
      *   ChecksumSHA1?: null|string,
      *   ChecksumSHA256?: null|string,
-     *   Expires?: null|\DateTimeImmutable|string,
+     *   Expires?: null|string,
      *   IfMatch?: null|string,
      *   IfNoneMatch?: null|string,
      *   GrantFullControl?: null|string,