diff --git a/include/watermark_runtime.inc.php b/include/watermark_runtime.inc.php
index f8d39b8..522c18c 100644
--- a/include/watermark_runtime.inc.php
+++ b/include/watermark_runtime.inc.php
@@ -52,11 +52,11 @@ function bratonien_tools_runtime_effective_rule($category_id)
   return bratonien_tools_resolve_album_rule((int)$category_id, $categories, $rules, $defaults);
 }
 
-function bratonien_tools_runtime_sign($rel_url, $profile_id)
+function bratonien_tools_runtime_sign($rel_url, $profile_id, $profile_version='')
 {
   global $conf;
   $key = !empty($conf['secret_key']) ? $conf['secret_key'] : ($conf['db_password'] ?? 'bratonien-tools');
-  return hash_hmac('sha256', $profile_id.'|'.$rel_url, $key);
+  return hash_hmac('sha256', $profile_id.'|'.$profile_version.'|'.$rel_url, $key);
 }
 
 function bratonien_tools_runtime_b64url_encode($value)
@@ -88,6 +88,27 @@ function bratonien_tools_profile_watermark_path(array $profile)
   return $path;
 }
 
+function bratonien_tools_runtime_profile_version(array $profile)
+{
+  $watermark_path = bratonien_tools_profile_watermark_path($profile);
+  $parts = array(
+    $profile['id'] ?? 0,
+    $profile['watermark_file'] ?? '',
+    $profile['scale_percent'] ?? 100,
+    $profile['xpos'] ?? 90,
+    $profile['ypos'] ?? 90,
+    $profile['xrepeat'] ?? 0,
+    $profile['yrepeat'] ?? 0,
+    $profile['opacity'] ?? 35,
+    $profile['min_width'] ?? 10,
+    $profile['min_height'] ?? 10,
+    $profile['active'] ?? 1,
+    $watermark_path ? @filemtime($watermark_path) : 0,
+  );
+
+  return substr(sha1(implode('|', $parts)), 0, 16);
+}
+
 function bratonien_tools_filter_derivative_url($url, $params, $src_image, $rel_url)
 {
   if (!bratonien_tools_watermark_engine_enabled())
@@ -122,8 +143,9 @@ function bratonien_tools_filter_derivative_url($url, $params, $src_image, $rel_u
   }
 
   $profile_id = (int)$profile['id'];
-  $signature = bratonien_tools_runtime_sign($rel_url, $profile_id);
+  $profile_version = bratonien_tools_runtime_profile_version($profile);
+  $signature = bratonien_tools_runtime_sign($rel_url, $profile_id, $profile_version);
 
-  return get_root_url().'plugins/'.BRATONIEN_TOOLS_ID.'/watermark.php?p='.$profile_id.'&u='.
-    rawurlencode(bratonien_tools_runtime_b64url_encode($rel_url)).'&s='.$signature;
+  return get_root_url().'plugins/'.BRATONIEN_TOOLS_ID.'/watermark.php?p='.$profile_id.'&v='.
+    rawurlencode($profile_version).'&u='.rawurlencode(bratonien_tools_runtime_b64url_encode($rel_url)).'&s='.$signature;
 }