diff --git a/README.md b/README.md
index d57255f..3c35bc6 100644
--- a/README.md
+++ b/README.md
@@ -12,6 +12,10 @@ Requires the shoppingfeed plugin
 
 ## Changelog
 
+### 1.0.5 (8-07-2025)
+
+* fix: set visibility to public for the __wakeup() method in the ShoppingFeedCustomFields class
+
 ### 1.0.4 (28-08-2023)
 
 * fix: missing value for select with single value
diff --git a/src/ShoppingFeedCustomFields.php b/src/ShoppingFeedCustomFields.php
index 524ceff..45292ff 100644
--- a/src/ShoppingFeedCustomFields.php
+++ b/src/ShoppingFeedCustomFields.php
@@ -96,6 +96,7 @@ private function __clone() {
 	/**
 	 * Singleton instance can't be serialized.
 	 */
-	private function __wakeup() {
+	public function __wakeup() {
+		throw new \Exception( 'Cannot unserialize a singleton.' );
 	}
 }