From 821562513526dcd439b253f25677cc2c998d8fef Mon Sep 17 00:00:00 2001
From: Bruno Oliveira <nicoddemus@gmail.com>
Date: Wed, 23 Sep 2020 09:14:27 -0300
Subject: [PATCH] Use new pip resolver in plugins tox env

Fix #7783
---
 tox.ini | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/tox.ini b/tox.ini
index 642076dd476..b42aecdf85c 100644
--- a/tox.ini
+++ b/tox.ini
@@ -116,7 +116,11 @@ commands =
     make regen
 
 [testenv:plugins]
+# use latest versions of all plugins, including pre-releases
 pip_pre=true
+# use latest pip and new dependency resolver (#7783)
+download=true
+install_command=python -m pip --use-feature=2020-resolver install {opts} {packages}
 changedir = testing/plugins_integration
 deps =
     anyio[curio,trio]