diff --git a/requirements/dev.txt b/requirements/dev.txt
index 7eb5f73664c..4f7f2c3fdd1 100644
--- a/requirements/dev.txt
+++ b/requirements/dev.txt
@@ -165,7 +165,7 @@ pluggy==0.13.1
     #   pytest
 pre-commit==2.15.0
     # via -r requirements/lint.txt
-proxy.py==2.3.1
+proxy.py==3.4.0
     # via -r requirements/test.txt
 py==1.10.0
     # via
diff --git a/requirements/test.txt b/requirements/test.txt
index 70efaabe694..3ba126cec81 100644
--- a/requirements/test.txt
+++ b/requirements/test.txt
@@ -5,7 +5,7 @@ cryptography==3.3.1; platform_machine!="i686" and python_version<"3.9" # no 32-b
 freezegun==1.1.0
 mypy==0.910; implementation_name=="cpython"
 mypy-extensions==0.4.3; implementation_name=="cpython"
-proxy.py==2.3.1
+proxy.py==3.4.0
 pytest==6.2.5
 pytest-cov==3.0.0
 pytest-mock==3.6.1
diff --git a/tests/test_proxy_functional.py b/tests/test_proxy_functional.py
index ab3f5986ac9..2ccb87e75a1 100644
--- a/tests/test_proxy_functional.py
+++ b/tests/test_proxy_functional.py
@@ -35,7 +35,7 @@
 
 
 @pytest.fixture
-def secure_proxy_url(monkeypatch, tls_certificate_pem_path):
+def secure_proxy_url(tls_certificate_pem_path):
     """Return the URL of an instance of a running secure proxy.
 
     This fixture also spawns that instance and tears it down after the test.
@@ -54,18 +54,11 @@ def secure_proxy_url(monkeypatch, tls_certificate_pem_path):
         tls_certificate_pem_path,  # contains both key and cert
     ]
 
-    class PatchedAccetorPool(proxy.core.acceptor.AcceptorPool):
-        def listen(self):
-            super().listen()
-            self.socket_host, self.socket_port = self.socket.getsockname()[:2]
-
-    monkeypatch.setattr(proxy.proxy, "AcceptorPool", PatchedAccetorPool)
-
     with proxy.Proxy(input_args=proxypy_args) as proxy_instance:
         yield URL.build(
             scheme="https",
-            host=proxy_instance.acceptors.socket_host,
-            port=proxy_instance.acceptors.socket_port,
+            host=proxy_instance.pool.flags.hostname,
+            port=proxy_instance.pool.flags.port,
         )