diff -U 3 -dHrN -- a/trytond/wsgi.py b/trytond/wsgi.py
--- a/trytond/wsgi.py	2021-02-12 10:14:41.000000000 +0100
+++ b/trytond/wsgi.py	2021-02-15 12:37:50.432511576 +0100
@@ -10,13 +10,23 @@
 from werkzeug.wrappers import Response
 from werkzeug.routing import Map, Rule
 from werkzeug.exceptions import abort, HTTPException, InternalServerError
-from werkzeug.contrib.fixers import ProxyFix
+try:
+    from werkzeug.middleware.proxy_fix import ProxyFix
+
+    def NumProxyFix(app, num_proxies):
+        return ProxyFix(app,
+            x_for=num_proxies, x_proto=num_proxies, x_host=num_proxies,
+            x_port=num_proxies, x_prefix=num_proxies)
+except ImportError:
+    from werkzeug.contrib.fixers import ProxyFix as NumProxyFix
 try:
     from werkzeug.security import safe_join
 except ImportError:
     safe_join = posixpath.join
-
-from werkzeug.wsgi import SharedDataMiddleware
+try:
+    from werkzeug.middleware.shared_data import SharedDataMiddleware
+except ImportError:
+    from werkzeug.wsgi import SharedDataMiddleware
 
 import wrapt
 
@@ -157,6 +167,6 @@
     app.wsgi_app = SharedDataMiddlewareIndex(app.wsgi_app, static_files)
 num_proxies = config.getint('web', 'num_proxies')
 if num_proxies:
-    app.wsgi_app = ProxyFix(app.wsgi_app, num_proxies=num_proxies)
+    app.wsgi_app = NumProxyFix(app.wsgi_app, num_proxies)
 import trytond.protocols.dispatcher
 import trytond.bus