diff --git a/rebuild b/rebuild
index 365a50b..1f1bd6a 100644
--- a/rebuild
+++ b/rebuild
@@ -2,4 +2,4 @@
 # when dependencies of the charm change,
 # but nothing in the charm needs to.
 # simply change the uuid to something new
-91d3391e-a4d0-11ea-812a-a3a958893dce
+d9e526e0-d02c-11ea-a3da-677cb807cdeb
diff --git a/tox.ini b/tox.ini
index 5b41c1d..afd48f0 100644
--- a/tox.ini
+++ b/tox.ini
@@ -50,6 +50,11 @@ basepython = python3.7
 deps = -r{toxinidir}/test-requirements.txt
 commands = stestr run --slowest {posargs}
 
+[testenv:py38]
+basepython = python3.8
+deps = -r{toxinidir}/test-requirements.txt
+commands = stestr run --slowest {posargs}
+
 [testenv:pep8]
 basepython = python3
 deps = -r{toxinidir}/test-requirements.txt