diff --git a/tox.ini b/tox.ini
index 47227898..c2219238 100644
--- a/tox.ini
+++ b/tox.ini
@@ -9,8 +9,8 @@ stxdir = {toxinidir}/..
 [testenv]
 install_command = pip install \
     -v -v -v \
-    -c{env:UPPER_CONSTRAINTS_FILE:https://opendev.org/openstack/requirements/raw/branch/stable/stein/upper-constraints.txt}  \
-    -U {opts} {packages}
+    -c https://opendev.org/openstack/requirements/raw/branch/stable/stein/upper-constraints.txt  \
+    {opts} {packages}
 
 setenv = VIRTUAL_ENV={envdir}
          OS_STDOUT_CAPTURE=1
@@ -56,7 +56,6 @@ basepython = python2.7
 usedevelop = False
 skip_install = True
 deps = {[testenv]deps}
-    git+git://github.com/starlingx-staging/stx-horizon.git
     -e{[tox]stxdir}/{env:STX_DC_CLIENT}/distributedcloud-client
     -e{[tox]stxdir}/config/sysinv/cgts-client/cgts-client
     -e{[tox]stxdir}/config/sysinv/sysinv/sysinv
@@ -65,6 +64,7 @@ deps = {[testenv]deps}
     -e{[tox]stxdir}/nfv/nfv/nfv-client
     -e{[tox]stxdir}/ha/service-mgmt-client/sm-client
     -e{[tox]stxdir}/utilities/ceph/python-cephclient/python-cephclient
+    horizon==15.2.0
     requests-toolbelt
     pylint
 commands =