diff --git a/tox.ini b/tox.ini
index d3317c06..af228b75 100644
--- a/tox.ini
+++ b/tox.ini
@@ -27,6 +27,7 @@ commands_pre =
 commands =
     poetry run coverage run --source=cyclonedx -m unittest discover -t . -s tests -v
 setenv =
+    PYTHONUTF8=1
     PYTHONHASHSEED=0
     CDX_TEST_RECREATE_SNAPSHOTS={env:CDX_TEST_RECREATE_SNAPSHOTS:}