diff --git a/tox.ini b/tox.ini
index 911b19cdb4a..761353a768a 100644
--- a/tox.ini
+++ b/tox.ini
@@ -9,9 +9,11 @@ setenv = VIRTUAL_ENV={envdir}
 passenv = TRACE_FAILONLY GENERATE_HASHES http_proxy HTTP_PROXY https_proxy HTTPS_PROXY no_proxy NO_PROXY
 usedevelop = True
 install_command =
-    pip install -U -c{env:UPPER_CONSTRAINTS_FILE:https://git.openstack.org/cgit/openstack/requirements/plain/upper-constraints.txt} {opts} {packages}
-deps = -r{toxinidir}/requirements.txt
-       -r{toxinidir}/test-requirements.txt
+  pip install {opts} {packages}
+deps =
+  -c{env:UPPER_CONSTRAINTS_FILE:https://git.openstack.org/cgit/openstack/requirements/plain/upper-constraints.txt}
+  -r{toxinidir}/requirements.txt
+  -r{toxinidir}/test-requirements.txt
 whitelist_externals = sh
 commands =
   {toxinidir}/tools/ostestr_compat_shim.sh {posargs}