diff --git a/tox.ini b/tox.ini
index 392c9dd7..f4fd99b7 100644
--- a/tox.ini
+++ b/tox.ini
@@ -12,7 +12,7 @@ passenv = *_proxy
 whitelist_externals = bash
                       find
                       rm
-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