diff --git a/.buildkite/scripts/test_old_deps.sh b/.buildkite/scripts/test_old_deps.sh
index 9fe5b696b0..3753f41a40 100755
--- a/.buildkite/scripts/test_old_deps.sh
+++ b/.buildkite/scripts/test_old_deps.sh
@@ -1,16 +1,16 @@
#!/usr/bin/env bash
# this script is run by buildkite in a plain `xenial` container; it installs the
-# minimal requirements for tox and hands over to the py35-old tox environment.
+# minimal requirements for tox and hands over to the py3-old tox environment.
set -ex
apt-get update
-apt-get install -y python3.5 python3.5-dev python3-pip libxml2-dev libxslt-dev xmlsec1 zlib1g-dev tox
+apt-get install -y python3 python3-dev python3-pip libxml2-dev libxslt-dev xmlsec1 zlib1g-dev tox
export LANG="C.UTF-8"
# Prevent virtualenv from auto-updating pip to an incompatible version
export VIRTUALENV_NO_DOWNLOAD=1
-exec tox -e py35-old,combine
+exec tox -e py3-old,combine
diff --git a/changelog.d/9769.misc b/changelog.d/9769.misc
new file mode 100644
index 0000000000..042a50615f
--- /dev/null
+++ b/changelog.d/9769.misc
@@ -0,0 +1 @@
+Fix incompatibility with `tox` 2.5.
diff --git a/tox.ini b/tox.ini
index 9ff70fe312..b2bc6f23ef 100644
--- a/tox.ini
+++ b/tox.ini
@@ -74,7 +74,7 @@ commands =
# we use "env" rather than putting a value in `setenv` so that it is not
# inherited by other tox environments.
#
- # keep this in sync with the copy in `testenv:py35-old`.
+ # keep this in sync with the copy in `testenv:py3-old`.
#
/usr/bin/env COVERAGE_PROCESS_START={toxinidir}/.coveragerc "{envbindir}/trial" {env:TRIAL_FLAGS:} {posargs:tests} {env:TOXSUFFIX:}
@@ -103,8 +103,9 @@ usedevelop=true
# A test suite for the oldest supported versions of Python libraries, to catch
# any uses of APIs not available in them.
-[testenv:py35-old]
-skip_install=True
+[testenv:py3-old]
+skip_install = true
+usedevelop = false
deps =
# Old automat version for Twisted
Automat == 0.3.0
@@ -136,7 +137,8 @@ commands =
python -m synmark {posargs:}
[testenv:packaging]
-skip_install=True
+skip_install = true
+usedevelop = false
deps =
check-manifest
commands =
@@ -154,7 +156,8 @@ extras = lint
commands = isort -c --df --sp setup.cfg {[base]lint_targets}
[testenv:check-newsfragment]
-skip_install = True
+skip_install = true
+usedevelop = false
deps = towncrier>=18.6.0rc1
commands =
python -m towncrier.check --compare-with=origin/develop
@@ -163,7 +166,8 @@ commands =
commands = {toxinidir}/scripts-dev/generate_sample_config --check
[testenv:combine]
-skip_install = True
+skip_install = true
+usedevelop = false
deps =
coverage
pip>=10 ; python_version >= '3.6'
@@ -173,14 +177,16 @@ commands=
coverage report
[testenv:cov-erase]
-skip_install = True
+skip_install = true
+usedevelop = false
deps =
coverage
commands=
coverage erase
[testenv:cov-html]
-skip_install = True
+skip_install = true
+usedevelop = false
deps =
coverage
commands=
|