diff --git a/src/XML/ds/AbstractKeyInfoType.php b/src/XML/ds/AbstractKeyInfoType.php
index 3753e670..1a227ea2 100644
--- a/src/XML/ds/AbstractKeyInfoType.php
+++ b/src/XML/ds/AbstractKeyInfoType.php
@@ -36,6 +36,7 @@ abstract class AbstractKeyInfoType extends AbstractDsElement
      *     \SimpleSAML\XMLSecurity\XML\ds\RetrievalMethod|
      *     \SimpleSAML\XMLSecurity\XML\ds\X509Data|
      *     \SimpleSAML\XMLSecurity\XML\ds\PGPData|
+     *     \SimpleSAML\XMLSecurity\XML\ds\MgmtData|
      *     \SimpleSAML\XML\SerializableElementInterface
      * )[] $info
      * @param string|null $Id
@@ -65,7 +66,15 @@ final public function __construct(
             if ($item instanceof AbstractDsElement) {
                 Assert::isInstanceOfAny(
                     $item,
-                    [KeyName::class, KeyValue::class, RetrievalMethod::class, X509Data::class, PGPData::class],
+                    [
+                        KeyName::class,
+                        KeyValue::class,
+                        RetrievalMethod::class,
+                        X509Data::class,
+                        PGPData::class,
+                        // SPKIData::class,
+                        MgmtData::class,
+                    ],
                     SchemaViolationException::class,
                 );
             }
diff --git a/tests/XML/ds/KeyInfoTest.php b/tests/XML/ds/KeyInfoTest.php
index 1ba1c1a2..d0cc384b 100644
--- a/tests/XML/ds/KeyInfoTest.php
+++ b/tests/XML/ds/KeyInfoTest.php
@@ -16,6 +16,7 @@
 use SimpleSAML\XMLSecurity\XML\ds\AbstractKeyInfoType;
 use SimpleSAML\XMLSecurity\XML\ds\KeyInfo;
 use SimpleSAML\XMLSecurity\XML\ds\KeyName;
+use SimpleSAML\XMLSecurity\XML\ds\MgmtData;
 use SimpleSAML\XMLSecurity\XML\ds\PGPData;
 use SimpleSAML\XMLSecurity\XML\ds\PGPKeyID;
 use SimpleSAML\XMLSecurity\XML\ds\PGPKeyPacket;
@@ -105,6 +106,7 @@ public function testMarshalling(): void
                     new PGPKeyPacket('GpM8'),
                     [new P('/CTj03d1DB5e2t7CTo9BEzCf5S9NRzwnBgZRlm32REI=')],
                 ),
+                new MgmtData('ManagementData'),
                 new Chunk(DOMDocumentFactory::fromString(
                     '<ssp:Chunk xmlns:ssp="urn:x-simplesamlphp:namespace">some</ssp:Chunk>',
                 )->documentElement),
diff --git a/tests/XML/xenc/OriginatorKeyInfoTest.php b/tests/XML/xenc/OriginatorKeyInfoTest.php
index 947f9d61..8b78e00c 100644
--- a/tests/XML/xenc/OriginatorKeyInfoTest.php
+++ b/tests/XML/xenc/OriginatorKeyInfoTest.php
@@ -14,6 +14,7 @@
 use SimpleSAML\XMLSecurity\XML\ds\AbstractDsElement;
 use SimpleSAML\XMLSecurity\XML\ds\AbstractKeyInfoType;
 use SimpleSAML\XMLSecurity\XML\ds\KeyName;
+use SimpleSAML\XMLSecurity\XML\ds\MgmtData;
 use SimpleSAML\XMLSecurity\XML\ds\PGPData;
 use SimpleSAML\XMLSecurity\XML\ds\PGPKeyID;
 use SimpleSAML\XMLSecurity\XML\ds\PGPKeyPacket;
@@ -101,6 +102,7 @@ public function testMarshalling(): void
                     new PGPKeyPacket('GpM8'),
                     [new P('/CTj03d1DB5e2t7CTo9BEzCf5S9NRzwnBgZRlm32REI=')],
                 ),
+                new MgmtData('ManagementData'),
                 new Chunk(DOMDocumentFactory::fromString(
                     '<ssp:Chunk xmlns:ssp="urn:x-simplesamlphp:namespace">some</ssp:Chunk>',
                 )->documentElement),
diff --git a/tests/XML/xenc/RecipientKeyInfoTest.php b/tests/XML/xenc/RecipientKeyInfoTest.php
index 7197a0e0..e59658ea 100644
--- a/tests/XML/xenc/RecipientKeyInfoTest.php
+++ b/tests/XML/xenc/RecipientKeyInfoTest.php
@@ -14,6 +14,7 @@
 use SimpleSAML\XMLSecurity\XML\ds\AbstractDsElement;
 use SimpleSAML\XMLSecurity\XML\ds\AbstractKeyInfoType;
 use SimpleSAML\XMLSecurity\XML\ds\KeyName;
+use SimpleSAML\XMLSecurity\XML\ds\MgmtData;
 use SimpleSAML\XMLSecurity\XML\ds\PGPData;
 use SimpleSAML\XMLSecurity\XML\ds\PGPKeyID;
 use SimpleSAML\XMLSecurity\XML\ds\PGPKeyPacket;
@@ -101,6 +102,7 @@ public function testMarshalling(): void
                     new PGPKeyPacket('GpM8'),
                     [new P('/CTj03d1DB5e2t7CTo9BEzCf5S9NRzwnBgZRlm32REI=')],
                 ),
+                new MgmtData('ManagementData'),
                 new Chunk(DOMDocumentFactory::fromString(
                     '<ssp:Chunk xmlns:ssp="urn:x-simplesamlphp:namespace">some</ssp:Chunk>',
                 )->documentElement),
diff --git a/tests/resources/xml/ds_KeyInfo.xml b/tests/resources/xml/ds_KeyInfo.xml
index 4a051ea7..ed6730e4 100644
--- a/tests/resources/xml/ds_KeyInfo.xml
+++ b/tests/resources/xml/ds_KeyInfo.xml
@@ -9,5 +9,6 @@
     <ds:PGPKeyPacket>GpM8</ds:PGPKeyPacket>
     <xenc:P xmlns:xenc="http://www.w3.org/2001/04/xmlenc#">/CTj03d1DB5e2t7CTo9BEzCf5S9NRzwnBgZRlm32REI=</xenc:P>
   </ds:PGPData>
+  <ds:MgmtData xmlns:ds="http://www.w3.org/2000/09/xmldsig#">ManagementData</ds:MgmtData>
   <ssp:Chunk xmlns:ssp="urn:x-simplesamlphp:namespace">some</ssp:Chunk>
 </ds:KeyInfo>
diff --git a/tests/resources/xml/ds_Signature.xml b/tests/resources/xml/ds_Signature.xml
index 66b7595f..9e23abb8 100644
--- a/tests/resources/xml/ds_Signature.xml
+++ b/tests/resources/xml/ds_Signature.xml
@@ -23,6 +23,7 @@
       <ds:PGPKeyPacket>GpM8</ds:PGPKeyPacket>
       <xenc:P xmlns:xenc="http://www.w3.org/2001/04/xmlenc#">/CTj03d1DB5e2t7CTo9BEzCf5S9NRzwnBgZRlm32REI=</xenc:P>
     </ds:PGPData>
+    <ds:MgmtData>ManagementData</ds:MgmtData>
     <ssp:Chunk xmlns:ssp="urn:x-simplesamlphp:namespace">some</ssp:Chunk>
   </ds:KeyInfo>
   <ds:Object>
diff --git a/tests/resources/xml/xenc_OriginatorKeyInfo.xml b/tests/resources/xml/xenc_OriginatorKeyInfo.xml
index 121f7edf..4472feab 100644
--- a/tests/resources/xml/xenc_OriginatorKeyInfo.xml
+++ b/tests/resources/xml/xenc_OriginatorKeyInfo.xml
@@ -9,5 +9,6 @@
     <ds:PGPKeyPacket>GpM8</ds:PGPKeyPacket>
     <xenc:P xmlns:xenc="http://www.w3.org/2001/04/xmlenc#">/CTj03d1DB5e2t7CTo9BEzCf5S9NRzwnBgZRlm32REI=</xenc:P>
   </ds:PGPData>
+  <ds:MgmtData xmlns:ds="http://www.w3.org/2000/09/xmldsig#">ManagementData</ds:MgmtData>
   <ssp:Chunk xmlns:ssp="urn:x-simplesamlphp:namespace">some</ssp:Chunk>
 </xenc:OriginatorKeyInfo>
diff --git a/tests/resources/xml/xenc_RecipientKeyInfo.xml b/tests/resources/xml/xenc_RecipientKeyInfo.xml
index 36a43030..4dcff148 100644
--- a/tests/resources/xml/xenc_RecipientKeyInfo.xml
+++ b/tests/resources/xml/xenc_RecipientKeyInfo.xml
@@ -9,5 +9,6 @@
     <ds:PGPKeyPacket>GpM8</ds:PGPKeyPacket>
     <xenc:P xmlns:xenc="http://www.w3.org/2001/04/xmlenc#">/CTj03d1DB5e2t7CTo9BEzCf5S9NRzwnBgZRlm32REI=</xenc:P>
   </ds:PGPData>
+  <ds:MgmtData xmlns:ds="http://www.w3.org/2000/09/xmldsig#">ManagementData</ds:MgmtData>
   <ssp:Chunk xmlns:ssp="urn:x-simplesamlphp:namespace">some</ssp:Chunk>
 </xenc:RecipientKeyInfo>