diff --git a/CHANGELOG.md b/CHANGELOG.md
index 6902854..6e8503a 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -7,6 +7,15 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## [Unreleased]
 
+## [0.5.11] - 2026-01-27
+
+### Fixed
+
+- **CRITICAL:** Fixed "sold out" message on licensed variable products by correcting `is_purchasable()` method
+- Variable products don't have a direct price - `is_purchasable()` now delegates to parent `WC_Product_Variable` class
+- Fixed variation class detection by using product ID parameter instead of unreliable global `$post`
+- Product class filter now properly accepts all 4 WooCommerce filter parameters for reliable variation detection
+
 ## [0.5.10] - 2026-01-27
 
 ### Fixed
diff --git a/releases/wc-licensed-product-0.5.11.zip b/releases/wc-licensed-product-0.5.11.zip
new file mode 100644
index 0000000..20325cb
Binary files /dev/null and b/releases/wc-licensed-product-0.5.11.zip differ
diff --git a/releases/wc-licensed-product-0.5.11.zip.sha256 b/releases/wc-licensed-product-0.5.11.zip.sha256
new file mode 100644
index 0000000..a1d7460
--- /dev/null
+++ b/releases/wc-licensed-product-0.5.11.zip.sha256
@@ -0,0 +1 @@
+32571178bfa8f0d0a03ed05b498d5f9b3c860104393a96732e86a03b6de298d2  wc-licensed-product-0.5.11.zip
diff --git a/src/Product/LicensedProductType.php b/src/Product/LicensedProductType.php
index 7abb461..ff9fe12 100644
--- a/src/Product/LicensedProductType.php
+++ b/src/Product/LicensedProductType.php
@@ -32,7 +32,7 @@ final class LicensedProductType
     {
         // Register product types
         add_filter('product_type_selector', [$this, 'addProductType']);
-        add_filter('woocommerce_product_class', [$this, 'getProductClass'], 10, 2);
+        add_filter('woocommerce_product_class', [$this, 'getProductClass'], 10, 4);
 
         // Add product data tabs
         add_filter('woocommerce_product_data_tabs', [$this, 'addProductDataTab']);
@@ -76,8 +76,13 @@ final class LicensedProductType
 
     /**
      * Get product class for licensed types
+     *
+     * @param string $className Default class name
+     * @param string $productType Product type
+     * @param string $postType Post type (usually 'product' or 'product_variation')
+     * @param int    $productId Product ID
      */
-    public function getProductClass(string $className, string $productType): string
+    public function getProductClass(string $className, string $productType, string $postType = '', int $productId = 0): string
     {
         if ($productType === 'licensed') {
             return LicensedProduct::class;
@@ -87,10 +92,21 @@ final class LicensedProductType
         }
         // Handle variations of licensed-variable products
         if ($productType === 'variation') {
-            // Check if parent is licensed-variable
-            global $post;
-            if ($post && $post->post_parent) {
-                $parentType = \WC_Product_Factory::get_product_type($post->post_parent);
+            // Get parent ID from the product post
+            $parentId = 0;
+            if ($productId > 0) {
+                $parentId = wp_get_post_parent_id($productId);
+            }
+            // Fallback to global $post if product ID not available
+            if (!$parentId) {
+                global $post;
+                if ($post && $post->post_parent) {
+                    $parentId = $post->post_parent;
+                }
+            }
+
+            if ($parentId) {
+                $parentType = \WC_Product_Factory::get_product_type($parentId);
                 if ($parentType === 'licensed-variable') {
                     return LicensedProductVariation::class;
                 }
diff --git a/src/Product/LicensedVariableProduct.php b/src/Product/LicensedVariableProduct.php
index 81fc864..d1eb233 100644
--- a/src/Product/LicensedVariableProduct.php
+++ b/src/Product/LicensedVariableProduct.php
@@ -50,11 +50,14 @@ class LicensedVariableProduct extends WC_Product_Variable
     }
 
     /**
-     * Licensed products are purchasable
+     * Licensed variable products are purchasable if the parent check passes
+     * Variable products don't have a direct price - their variations do
      */
     public function is_purchasable(): bool
     {
-        return $this->exists() && $this->get_price() !== '';
+        // Use the parent WC_Product_Variable logic
+        // which checks exists() and status, not price
+        return parent::is_purchasable();
     }
 
     /**
diff --git a/wc-licensed-product.php b/wc-licensed-product.php
index bb4d435..2600266 100644
--- a/wc-licensed-product.php
+++ b/wc-licensed-product.php
@@ -3,7 +3,7 @@
  * Plugin Name: WooCommerce Licensed Product
  * Plugin URI: https://src.bundespruefstelle.ch/magdev/wc-licensed-product
  * Description: WooCommerce plugin to sell software products using license keys with domain-based validation.
- * Version: 0.5.10
+ * Version: 0.5.11
  * Author: Marco Graetsch
  * Author URI: https://src.bundespruefstelle.ch/magdev
  * License: GPL-2.0-or-later
@@ -28,7 +28,7 @@ if (!defined('ABSPATH')) {
 }
 
 // Plugin constants
-define('WC_LICENSED_PRODUCT_VERSION', '0.5.10');
+define('WC_LICENSED_PRODUCT_VERSION', '0.5.11');
 define('WC_LICENSED_PRODUCT_PLUGIN_FILE', __FILE__);
 define('WC_LICENSED_PRODUCT_PLUGIN_DIR', plugin_dir_path(__FILE__));
 define('WC_LICENSED_PRODUCT_PLUGIN_URL', plugin_dir_url(__FILE__));