diff --git a/psalm.xml.dist b/psalm.xml.dist
index 729e9a9..30258a7 100644
--- a/psalm.xml.dist
+++ b/psalm.xml.dist
@@ -1,6 +1,5 @@
 <?xml version="1.0"?>
 <psalm
-    totallyTyped="false"
     errorLevel="3"
     resolveFromConfigFile="true"
     xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
diff --git a/src/Data.php b/src/Data.php
index 46e7f86..3409b8e 100644
--- a/src/Data.php
+++ b/src/Data.php
@@ -203,6 +203,8 @@ public function export(): array
 
     /**
      * {@inheritdoc}
+     *
+     * @return bool
      */
     #[\ReturnTypeWillChange]
     public function offsetExists($key)
@@ -212,6 +214,8 @@ public function offsetExists($key)
 
     /**
      * {@inheritdoc}
+     *
+     * @return mixed
      */
     #[\ReturnTypeWillChange]
     public function offsetGet($key)
@@ -224,6 +228,8 @@ public function offsetGet($key)
      *
      * @param string $key
      * @param mixed $value
+     *
+     * @return void
      */
     #[\ReturnTypeWillChange]
     public function offsetSet($key, $value)
@@ -233,6 +239,8 @@ public function offsetSet($key, $value)
 
     /**
      * {@inheritdoc}
+     *
+     * @return void
      */
     #[\ReturnTypeWillChange]
     public function offsetUnset($key)