diff --git a/tox.ini b/tox.ini
index 7309de6c..4befdbcc 100644
--- a/tox.ini
+++ b/tox.ini
@@ -86,3 +86,5 @@ deps =
 commands = pytest {toxinidir}/tests/functional {posargs:-v}
 deps =
   -r {toxinidir}/tests/functional/requirements.txt
+  # Pin libjuju version since func tests are breaking with v3.3.1
+  juju~=3.1.0