diff --git a/rebuild b/rebuild
index 5fe9185..ca708f9 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
-53d1cce6-1178-11ec-9722-97d8d41c4f76
+acd26946-3b6e-11ee-aa67-73c682c2795e
diff --git a/tox.ini b/tox.ini
index 782b398..ff8c050 100644
--- a/tox.ini
+++ b/tox.ini
@@ -92,7 +92,8 @@ commands = stestr run --slowest {posargs}
 [testenv:pep8]
 basepython = python3
 deps = flake8==3.9.2
-       charm-tools==2.8.3
+       PyYAML==6.0.1
+       charm-tools==2.8.6
 commands = flake8 {posargs} src unit_tests
 
 [testenv:func-target]