From 32c872a7189e10193b1ff80a8938381ac2dd4ce5 Mon Sep 17 00:00:00 2001
From: Brad Warren <bmw@eff.org>
Date: Mon, 1 Jul 2019 11:20:31 -0700
Subject: [PATCH] Update virtualenv with CERTBOT_NO_PIN.

---
 .travis.yml | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/.travis.yml b/.travis.yml
index 5933cfe68..cf399bbd6 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -268,7 +268,9 @@ addons:
 
 # tools/pip_install.py is used to pin packages to a known working version
 # except in tests where the environment variable CERTBOT_NO_PIN is set.
-install: "tools/pip_install.py codecov tox"
+# virtualenv is listed here explicitly to make sure it is upgraded when
+# CERTBOT_NO_PIN is set.
+install: "tools/pip_install.py codecov tox virtualenv"
 script: tox
 
 after_success: '[ "$TOXENV" == "py27-cover" ] && codecov -F linux'