diff --git a/src/Persistence/Mapping/ClassMetadata.php b/src/Persistence/Mapping/ClassMetadata.php
index 38c628e6..1cc434ed 100644
--- a/src/Persistence/Mapping/ClassMetadata.php
+++ b/src/Persistence/Mapping/ClassMetadata.php
@@ -35,7 +35,7 @@ public function getIdentifier(): array;
      *
      * @return ReflectionClass<T>
      */
-    public function getReflectionClass(): ReflectionClass;
+    public function getReflectionClass();
 
     /** Checks if the given field name is a mapped identifier for this class. */
     public function isIdentifier(string $fieldName): bool;
diff --git a/src/Persistence/Mapping/Driver/FileDriver.php b/src/Persistence/Mapping/Driver/FileDriver.php
index 1f035363..2264111d 100644
--- a/src/Persistence/Mapping/Driver/FileDriver.php
+++ b/src/Persistence/Mapping/Driver/FileDriver.php
@@ -71,7 +71,7 @@ public function getGlobalBasename(): string
      *
      * @throws MappingException
      */
-    public function getElement(string $className): ClassMetadata
+    public function getElement(string $className)
     {
         if ($this->classCache === null) {
             $this->initialize();
@@ -139,7 +139,7 @@ public function getAllClassNames(): array
      * @return ClassMetadata[]
      * @psalm-return array<class-string, ClassMetadata<object>>
      */
-    abstract protected function loadMappingFile(string $file): array;
+    abstract protected function loadMappingFile(string $file);
 
     /**
      * Initializes the class cache from all the global files.
diff --git a/src/Persistence/Proxy.php b/src/Persistence/Proxy.php
index 7394111f..d597e103 100644
--- a/src/Persistence/Proxy.php
+++ b/src/Persistence/Proxy.php
@@ -26,7 +26,7 @@ interface Proxy
      *
      * Acts as a no-op if already initialized.
      */
-    public function __load(): void;
+    public function __load();
 
     /** Returns whether this proxy is initialized or not. */
     public function __isInitialized(): bool;