diff --git a/lib/Deserializer/functions.php b/lib/Deserializer/functions.php
index c0ecb4d..7b8f715 100644
--- a/lib/Deserializer/functions.php
+++ b/lib/Deserializer/functions.php
@@ -358,7 +358,12 @@ function functionCaller(Reader $reader, callable $func, string $namespace)
     } elseif (is_string($func) && str_contains($func, '::')) {
         // We have a string that should refer to a method that exists, like "MyClass::someMethod"
         // ReflectionMethod knows how to handle that as-is
-        $ref = new \ReflectionMethod($func);
+        if (PHP_VERSION_ID >= 80400) {
+            // @phpstan-ignore staticMethod.notFound
+            $ref = \ReflectionMethod::createFromMethodName($func);
+        } else {
+            $ref = new \ReflectionMethod($func);
+        }
     } elseif ($func instanceof \Closure || is_string($func)) {
         // We have an actual Closure (a real function) or a string that is the name of a function
         // ReflectionFunction can take either of those
diff --git a/phpstan-baseline.neon b/phpstan-baseline.neon
index ec0c143..675fad3 100644
--- a/phpstan-baseline.neon
+++ b/phpstan-baseline.neon
@@ -1,6 +1,6 @@
 parameters:
   ignoreErrors:
   -
-    message: "#^Call to function is_null\\(\\) with null will always evaluate to true\\.$#"
+    rawMessage: "Call to function is_null() with null will always evaluate to true."
     path: lib/Serializer/functions.php
     count: 1
diff --git a/phpstan.neon b/phpstan.neon
index a6beaea..14f00f0 100644
--- a/phpstan.neon
+++ b/phpstan.neon
@@ -8,5 +8,5 @@ parameters:
     - tests
   ignoreErrors:
     -
-      message: '#^Dynamic call to static method XMLReader::XML\(\)\.$#'
+      rawMessage: 'Dynamic call to static method XMLReader::XML().'
       identifier: staticMethod.dynamicCall
diff --git a/tests/phpunit.xml b/tests/phpunit.xml
index efb74fd..651f97c 100644
--- a/tests/phpunit.xml
+++ b/tests/phpunit.xml
@@ -1,5 +1,15 @@
 <?xml version="1.0"?>
-<phpunit xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" colors="true" bootstrap="../vendor/autoload.php" beStrictAboutTestsThatDoNotTestAnything="true" beStrictAboutOutputDuringTests="true" failOnRisky="true" failOnWarning="true" xsi:noNamespaceSchemaLocation="https://schema.phpunit.de/10.5/phpunit.xsd" cacheDirectory=".phpunit.cache">
+<phpunit xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+         colors="true"
+         bootstrap="../vendor/autoload.php"
+         beStrictAboutTestsThatDoNotTestAnything="true"
+         beStrictAboutOutputDuringTests="true"
+         failOnRisky="true"
+         failOnWarning="true"
+         failOnDeprecation="true"
+         xsi:noNamespaceSchemaLocation="https://schema.phpunit.de/10.5/phpunit.xsd"
+         cacheDirectory=".phpunit.cache"
+>
   <testsuites>
     <testsuite name="Sabre_XML">
       <directory>.</directory>