diff --git a/.github/workflows/php.yml b/.github/workflows/php.yml
index e94cd3a..7294a5b 100644
--- a/.github/workflows/php.yml
+++ b/.github/workflows/php.yml
@@ -80,7 +80,6 @@ jobs:
         run: phpcs
 
       - name: Psalm
-        continue-on-error: true
         run: |
           psalm -c psalm.xml \
           --show-info=true \
diff --git a/composer.json b/composer.json
index 6d9d17c..73755bb 100644
--- a/composer.json
+++ b/composer.json
@@ -12,7 +12,7 @@
         "php": "^8.0",
         "ext-dom": "*",
 
-        "simplesamlphp/xml-common": "^1.8.0",
+        "simplesamlphp/xml-common": "^1.9.0",
         "simplesamlphp/assert": "^1.0.4"
     },
     "require-dev": {
diff --git a/src/XML/cas/Attributes.php b/src/XML/cas/Attributes.php
index e383857..012028a 100644
--- a/src/XML/cas/Attributes.php
+++ b/src/XML/cas/Attributes.php
@@ -25,7 +25,7 @@ final class Attributes extends AbstractCasElement
     public const LOCALNAME = 'attributes';
 
     /** The namespace-attribute for the xs:any element */
-    public const NAMESPACE = C::XS_ANY_NS_ANY;
+    public const XS_ANY_ELT_NAMESPACE = C::XS_ANY_NS_ANY;
 
 
     /**
diff --git a/src/XML/cas/AuthenticationFailure.php b/src/XML/cas/AuthenticationFailure.php
index f88c255..ac4a060 100644
--- a/src/XML/cas/AuthenticationFailure.php
+++ b/src/XML/cas/AuthenticationFailure.php
@@ -83,7 +83,6 @@ public static function fromXML(DOMElement $xml): static
             MissingAttributeException::class,
         );
 
-        /** @psalm-var string $code */
         $code = self::getAttribute($xml, 'code');
         return new static(trim($xml->textContent), $code);
     }
diff --git a/src/XML/cas/ProxyFailure.php b/src/XML/cas/ProxyFailure.php
index 7a0006c..4b679d5 100644
--- a/src/XML/cas/ProxyFailure.php
+++ b/src/XML/cas/ProxyFailure.php
@@ -82,7 +82,6 @@ public static function fromXML(DOMElement $xml): static
             MissingAttributeException::class,
         );
 
-        /** @psalm-var string $code */
         $code = self::getAttribute($xml, 'code');
         return new static(trim($xml->textContent), $code);
     }