From a8703819ebc1f36471e8067f9ce5ff5527877dfe Mon Sep 17 00:00:00 2001
From: Patrick Cloke <clokep@users.noreply.github.com>
Date: Mon, 18 Jan 2021 09:35:42 -0500
Subject: [PATCH] Fix the Python 3.5 old-deps build. (#9146)

setuptools 51.0.0 dropped support for Python 3.5.
---
 changelog.d/9146.misc | 1 +
 tox.ini               | 3 +++
 2 files changed, 4 insertions(+)
 create mode 100644 changelog.d/9146.misc

diff --git a/changelog.d/9146.misc b/changelog.d/9146.misc
new file mode 100644
index 000000000..7af29baa3
--- /dev/null
+++ b/changelog.d/9146.misc
@@ -0,0 +1 @@
+Fix the Python 3.5 + old dependencies build in CI.
diff --git a/tox.ini b/tox.ini
index 297136fcc..5210e7b86 100644
--- a/tox.ini
+++ b/tox.ini
@@ -103,6 +103,9 @@ usedevelop=true
 [testenv:py35-old]
 skip_install=True
 deps =
+    # Ensure a version of setuptools that supports Python 3.5 is installed.
+    setuptools < 51.0.0
+
     # Old automat version for Twisted
     Automat == 0.3.0