diff --git a/src/Signature/SignatureProvider.php b/src/Signature/SignatureProvider.php
index f328de8435..5d496d763d 100644
--- a/src/Signature/SignatureProvider.php
+++ b/src/Signature/SignatureProvider.php
@@ -44,6 +44,7 @@ class SignatureProvider
     private static $s3v4SignedServices = [
         's3' => true,
         's3control' => true,
+        's3-outposts' => true,
         's3-object-lambda' => true,
         's3express' => true
     ];
diff --git a/tests/Signature/SignatureProviderTest.php b/tests/Signature/SignatureProviderTest.php
index f794f9a0c3..cbd945299b 100644
--- a/tests/Signature/SignatureProviderTest.php
+++ b/tests/Signature/SignatureProviderTest.php
@@ -29,7 +29,8 @@ public function versionProvider()
             ['v4a', SignatureV4::class, 'eventbridge'],
             ['v4-s3express', S3ExpressSignature::class, 's3express'],
             ['v4-unsigned-body', SignatureV4::class, 'foo'],
-            ['anonymous', AnonymousSignature::class, 's3']
+            ['anonymous', AnonymousSignature::class, 's3'],
+            ['s3v4', S3SignatureV4::class, 's3-outposts']
         ];
     }