diff --git a/python-k8sapp-ptp-notification/k8sapp_ptp_notification/requirements.txt b/python-k8sapp-ptp-notification/k8sapp_ptp_notification/requirements.txt
index e71df21..1499a7c 100644
--- a/python-k8sapp-ptp-notification/k8sapp_ptp_notification/requirements.txt
+++ b/python-k8sapp-ptp-notification/k8sapp_ptp_notification/requirements.txt
@@ -1,2 +1,2 @@
-pbr>=2.0.0
-PyYAML==3.10
+pbr===5.1.3
+PyYAML>=3.13
diff --git a/python-k8sapp-ptp-notification/k8sapp_ptp_notification/test-requirements.txt b/python-k8sapp-ptp-notification/k8sapp_ptp_notification/test-requirements.txt
index e248a36..9a65221 100644
--- a/python-k8sapp-ptp-notification/k8sapp_ptp_notification/test-requirements.txt
+++ b/python-k8sapp-ptp-notification/k8sapp_ptp_notification/test-requirements.txt
@@ -12,13 +12,13 @@ passlib>=1.7.0
 psycopg2-binary
 python-subunit>=0.0.18
 requests-mock>=0.6.0 # Apache-2.0
-sphinx!=1.2.0,!=1.3b1,<1.3,>=1.1.2
-oslosphinx<2.6.0,>=2.5.0 # Apache-2.0
+sphinx===1.8.4
+oslosphinx===4.18.0 # Apache-2.0
 oslotest>=3.2.0 # Apache-2.0
 stestr>=1.0.0 # Apache-2.0
 testrepository>=0.0.18
 testtools!=1.2.0,>=0.9.36
-tempest-lib<0.5.0,>=0.4.0
+tempest-lib===1.0.0
 ipaddr
 pytest
 pyudev
diff --git a/python-k8sapp-ptp-notification/k8sapp_ptp_notification/tox.ini b/python-k8sapp-ptp-notification/k8sapp_ptp_notification/tox.ini
index d3d81a9..baf7a8d 100644
--- a/python-k8sapp-ptp-notification/k8sapp_ptp_notification/tox.ini
+++ b/python-k8sapp-ptp-notification/k8sapp_ptp_notification/tox.ini
@@ -21,8 +21,7 @@ sitepackages = True
 whitelist_externals = bash
                       find
 
-install_command = pip install --use-deprecated legacy-resolver \
-    -v -v -v \
+install_command = pip install -v -v -v \
     -c{toxinidir}/upper-constraints.txt \
     -c{env:UPPER_CONSTRAINTS_FILE:https://opendev.org/openstack/requirements/raw/branch/stable/stein/upper-constraints.txt} \
     {opts} {packages}