diff --git a/tox.ini b/tox.ini
index 6a9f87b9d..a55f1ff1e 100644
--- a/tox.ini
+++ b/tox.ini
@@ -10,7 +10,7 @@ setenv =
 passenv = *_proxy
           *_PROXY
 usedevelop = True
-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