diff --git a/tox.ini b/tox.ini
index 145fda15..4bdbc6d0 100644
--- a/tox.ini
+++ b/tox.ini
@@ -7,7 +7,7 @@ setenv =
     VIRTUAL_ENV={envdir}
     BRANCH_NAME=master
     CLIENT_NAME=oslo.service
-install_command = pip install -U {opts} {packages}
+install_command = pip install {opts} {packages}
 deps =
   -c{env:UPPER_CONSTRAINTS_FILE:https://git.openstack.org/cgit/openstack/requirements/plain/upper-constraints.txt}
   -r{toxinidir}/test-requirements.txt