diff --git a/searxng_extra/update/update_firefox_version.py b/searxng_extra/update/update_firefox_version.py
index 6a446947..07bcef7f 100755
--- a/searxng_extra/update/update_firefox_version.py
+++ b/searxng_extra/update/update_firefox_version.py
@@ -20,7 +20,7 @@ NORMAL_REGEX = re.compile('^[0-9]+\.[0-9](\.[0-9])?$')
 #
 useragents = {
     "versions": (),
-    "os": ('Windows NT 10.0; WOW64',
+    "os": ('Windows NT 10.0; Win64; x64',
            'X11; Linux x86_64'),
     "ua": "Mozilla/5.0 ({os}; rv:{version}) Gecko/20100101 Firefox/{version}"
 }