diff --git a/tox.ini b/tox.ini
index ed727fbeaa..ed0a97aad5 100644
--- a/tox.ini
+++ b/tox.ini
@@ -18,7 +18,7 @@ setenv =
 # clue for oslo.db to use file-based database.
   OS_TEST_DBAPI_ADMIN_CONNECTION=sqlite:////tmp/placeholder-never-created-nor-used.db
 usedevelop = True
-install_command = pip install -c{env:UPPER_CONSTRAINTS_FILE:https://opendev.org/openstack/requirements/raw/branch/master/upper-constraints.txt} {opts} {packages}
+install_command = pip install -c{env:UPPER_CONSTRAINTS_FILE:https://releases.openstack.org/constraints/upper/master} {opts} {packages}
 deps = -r{toxinidir}/test-requirements.txt
 commands =
     find . -type f -name "*.pyc" -delete
@@ -128,7 +128,7 @@ basepython = python3
 # This environment is called from CI scripts to test and publish
 # the API Ref to docs.openstack.org.
 deps =
-    -c{env:UPPER_CONSTRAINTS_FILE:https://opendev.org/openstack/requirements/raw/branch/master/upper-constraints.txt}
+    -c{env:UPPER_CONSTRAINTS_FILE:https://releases.openstack.org/constraints/upper/master}
     -r{toxinidir}/doc/requirements.txt
 commands =
   rm -rf api-ref/build
@@ -165,7 +165,7 @@ import_exceptions = glance.i18n
 [testenv:docs]
 basepython = python3
 deps =
-    -c{env:UPPER_CONSTRAINTS_FILE:https://opendev.org/openstack/requirements/raw/branch/master/upper-constraints.txt}
+    -c{env:UPPER_CONSTRAINTS_FILE:https://releases.openstack.org/constraints/upper/master}
     -r{toxinidir}/doc/requirements.txt
 commands =
   rm -fr doc/build
@@ -179,7 +179,7 @@ commands = {posargs}
 [testenv:releasenotes]
 basepython = python3
 deps =
-    -c{env:UPPER_CONSTRAINTS_FILE:https://opendev.org/openstack/requirements/raw/branch/master/upper-constraints.txt}
+    -c{env:UPPER_CONSTRAINTS_FILE:https://releases.openstack.org/constraints/upper/master}
     -r{toxinidir}/doc/requirements.txt
 commands =
   sphinx-build -a -E -W -d releasenotes/build/doctrees -b html releasenotes/source releasenotes/build/html