diff --git a/tox.ini b/tox.ini
index 264ac49712..4bf0a2b14e 100644
--- a/tox.ini
+++ b/tox.ini
@@ -147,7 +147,6 @@ filterwarnings =
     ignore:invalid escape sequence:DeprecationWarning:.*netaddr.*
     ignore:invalid escape sequence:DeprecationWarning:.*prettytable
     ignore:invalid escape sequence:DeprecationWarning:.*subunit.*
-    ignore:invalid escape sequence:DeprecationWarning:.*testtools.*
     # python 3.7
     ignore:Using or importing the ABCs:DeprecationWarning:unittest2.*
     # python 3.8
diff --git a/upper-constraints.txt b/upper-constraints.txt
index 17569f68b0..1ba64f87a7 100644
--- a/upper-constraints.txt
+++ b/upper-constraints.txt
@@ -9,7 +9,6 @@ paramiko===2.6.0
 pbr===5.4.3
 PrettyTable===0.7.2
 pyOpenSSL===19.0.0
-python-subunit===1.3.0
 PyYAML===5.1.2
 six===1.13.0
 SQLAlchemy===1.3.13