diff --git a/tools/pytest.ini b/tools/pytest.ini
index ccf84ee823f4d1..3f3d0983ab1839 100644
--- a/tools/pytest.ini
+++ b/tools/pytest.ini
@@ -20,6 +20,8 @@ filterwarnings =
     ignore:This method will be removed in .*\.\s+Use 'parser\.read_file\(\)' instead\.:DeprecationWarning:mozversion
     # ignore mozversion not cleanly closing .ini files
     ignore:unclosed file.*\.ini:ResourceWarning:mozversion
+    # mozrunner uses telnetlib module
+    ignore:'telnetlib' is deprecated and slated for removal in Python 3:DeprecationWarning
     # https://github.com/web-platform-tests/wpt/issues/39366
     always:The metaschema specified by \$schema was not found\. Using the latest draft to validate, but this will raise an error in the future\.:DeprecationWarning
     # https://github.com/web-platform-tests/wpt/issues/39359