diff --git a/src/Server/Session/Session.php b/src/Server/Session/Session.php
index 6bf3c30..e02fcc7 100644
--- a/src/Server/Session/Session.php
+++ b/src/Server/Session/Session.php
@@ -51,9 +51,9 @@ public function getStore(): SessionStoreInterface
         return $this->store;
     }
 
-    public function save(): void
+    public function save(): bool
     {
-        $this->store->write($this->id, json_encode($this->data, \JSON_THROW_ON_ERROR));
+        return $this->store->write($this->id, json_encode($this->data, \JSON_THROW_ON_ERROR));
     }
 
     public function get(string $key, mixed $default = null): mixed
diff --git a/src/Server/Session/SessionInterface.php b/src/Server/Session/SessionInterface.php
index 9ee5e80..8f93a6e 100644
--- a/src/Server/Session/SessionInterface.php
+++ b/src/Server/Session/SessionInterface.php
@@ -26,7 +26,7 @@ public function getId(): Uuid;
     /**
      * Save the session.
      */
-    public function save(): void;
+    public function save(): bool;
 
     /**
      * Get a specific attribute from the session.