From 63a021c1641562c323b89d284ac3107ca3807c88 Mon Sep 17 00:00:00 2001
From: Sophia Yang <sophia.yang@mongodb.com>
Date: Thu, 4 Jun 2026 10:37:52 -0400
Subject: [PATCH 1/2] bump maxWireVersion 29

---
 pymongo/common.py     | 4 ++--
 test/test_topology.py | 2 +-
 2 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/pymongo/common.py b/pymongo/common.py
index ea349b3d23..7ab4b64d2c 100644
--- a/pymongo/common.py
+++ b/pymongo/common.py
@@ -69,8 +69,8 @@
 # What this version of PyMongo supports.
 MIN_SUPPORTED_SERVER_VERSION = "4.2"
 MIN_SUPPORTED_WIRE_VERSION = 8
-# MongoDB 8.0
-MAX_SUPPORTED_WIRE_VERSION = 25
+# MongoDB 9.0
+MAX_SUPPORTED_WIRE_VERSION = 29
 
 # Frequency to call hello on servers, in seconds.
 HEARTBEAT_FREQUENCY = 10
diff --git a/test/test_topology.py b/test/test_topology.py
index c87c48819e..8738f97d2a 100644
--- a/test/test_topology.py
+++ b/test/test_topology.py
@@ -594,7 +594,7 @@ def test_wire_version(self):
                 "setName": "rs",
                 "hosts": ["a"],
                 "minWireVersion": 26,
-                "maxWireVersion": 27,
+                "maxWireVersion": 29,
             },
         )
 

From beae88fbfa68ee265669be8d815724f6451b2c2d Mon Sep 17 00:00:00 2001
From: Sophia Yang <sophia.yang@mongodb.com>
Date: Thu, 4 Jun 2026 11:09:31 -0400
Subject: [PATCH 2/2] use shared const in test assert

---
 test/test_topology.py | 9 +++++----
 1 file changed, 5 insertions(+), 4 deletions(-)

diff --git a/test/test_topology.py b/test/test_topology.py
index 8738f97d2a..83e269560f 100644
--- a/test/test_topology.py
+++ b/test/test_topology.py
@@ -593,8 +593,8 @@ def test_wire_version(self):
                 HelloCompat.LEGACY_CMD: True,
                 "setName": "rs",
                 "hosts": ["a"],
-                "minWireVersion": 26,
-                "maxWireVersion": 29,
+                "minWireVersion": common.MAX_SUPPORTED_WIRE_VERSION + 1,
+                "maxWireVersion": common.MAX_SUPPORTED_WIRE_VERSION + 2,
             },
         )
 
@@ -604,8 +604,9 @@ def test_wire_version(self):
             # Error message should say which server failed and why.
             self.assertEqual(
                 str(e),
-                "Server at a:27017 requires wire version 26, but this version "
-                "of PyMongo only supports up to %d." % (common.MAX_SUPPORTED_WIRE_VERSION,),
+                "Server at a:27017 requires wire version %d, but this version "
+                "of PyMongo only supports up to %d."
+                % (common.MAX_SUPPORTED_WIRE_VERSION + 1, common.MAX_SUPPORTED_WIRE_VERSION),
             )
         else:
             self.fail("No error with incompatible wire version")