diff --git a/tox.ini b/tox.ini
index c43a7e8c0..3ebe3b4a2 100644
--- a/tox.ini
+++ b/tox.ini
@@ -10,7 +10,7 @@ setenv =
   SQLALCHEMY_WARN_20=1
 usedevelop = True
 deps =
-  -c{env:TOX_CONSTRAINTS_FILE:https://releases.openstack.org/constraints/upper/master}
+  -c{env:TOX_CONSTRAINTS_FILE:https://releases.openstack.org/constraints/upper/2024.1}
   -r{toxinidir}/requirements.txt
   -r{toxinidir}/test-requirements.txt
 commands =
@@ -67,7 +67,7 @@ commands = oslo_debug_helper -t barbican/tests {posargs}
 # the main docs to https://docs.openstack.org/barbican
 description = Build main documentation
 deps =
-  -c{env:TOX_CONSTRAINTS_FILE:https://releases.openstack.org/constraints/upper/master}
+  -c{env:TOX_CONSTRAINTS_FILE:https://releases.openstack.org/constraints/upper/2024.1}
   -r{toxinidir}/requirements.txt
   -r{toxinidir}/doc/requirements.txt
 commands=
@@ -109,7 +109,7 @@ allowlist_externals =
 # Note: This requires local running instances of Barbican and Keystone
 # TODO(dmend): remove --serial and uncomment coverage commands
 deps =
-  -c{env:TOX_CONSTRAINTS_FILE:https://releases.openstack.org/constraints/upper/master}
+  -c{env:TOX_CONSTRAINTS_FILE:https://releases.openstack.org/constraints/upper/2024.1}
   -r{toxinidir}/test-requirements.txt
 setenv =
     OS_TEST_PATH={toxinidir}/functionaltests
@@ -129,7 +129,7 @@ passenv = KMIP_PLUGIN_ENABLED
 # This tox env is purely to make local test development easier
 # Note: This requires local running instances of Barbican and Keystone
 deps =
-  -c{env:TOX_CONSTRAINTS_FILE:https://releases.openstack.org/constraints/upper/master}
+  -c{env:TOX_CONSTRAINTS_FILE:https://releases.openstack.org/constraints/upper/2024.1}
   -r{toxinidir}/test-requirements.txt
 setenv =
     OS_TEST_PATH={toxinidir}/barbican/cmd/functionaltests