diff --git a/src/WordPress/Blueprints/Model/DataClass/UnzipStep.php b/src/WordPress/Blueprints/Model/DataClass/UnzipStep.php
index a5c67994..80a9ab66 100644
--- a/src/WordPress/Blueprints/Model/DataClass/UnzipStep.php
+++ b/src/WordPress/Blueprints/Model/DataClass/UnzipStep.php
@@ -10,7 +10,7 @@ class UnzipStep implements StepDefinitionInterface {
 	public Progress $progress;
 
 	/** @var bool */
-	public $continueOnError;
+	public bool $continueOnError;
 
 	/**
 	 * Step
@@ -24,7 +24,9 @@ class UnzipStep implements StepDefinitionInterface {
 	 *
 	 * @var string|ResourceDefinitionInterface
 	 */
-	public $zip_file;
+
+	// @TODO: Union types are PHP >= 8.0. Fix needed.
+	public string|ResourceDefinitionInterface $zip_file;
 
 	/**
 	 * The path to extract the zip file to