1 files changed, 1 insertions, 1 deletions

diff --git a/tox.ini b/tox.ini
index cc1472fe..93dd910a 100644
--- a/tox.ini
+++ b/tox.ini
@@ -9,7 +9,7 @@ deps =
   -c{env:UPPER_CONSTRAINTS_FILE:https://opendev.org/openstack/requirements/raw/branch/master/upper-constraints.txt}
   -r{toxinidir}/requirements.txt
   -r{toxinidir}/test-requirements.txt
-install_command = pip install {opts} {packages}
+install_command = pip install --use-deprecated=legacy-resolver {opts} {packages}
 commands =
   pytest \
     --junit-xml=junit.xml \