The expected value changed for the proxies keyword
diff --git a/test_requests.py b/test_requests.py
index 13b9d64ced..dbb38064aa 100755
--- a/test_requests.py
+++ b/test_requests.py
@@ -1258,7 +1258,7 @@ class TestRedirects:
         'cert': None,
         'timeout': None,
         'allow_redirects': False,
-        'proxies': None,
+        'proxies': {},
     }
 
     def test_requests_are_updated_each_time(self):

It used to be None but a recent PR changed that before my last one was merged

Fixes #1975 
