diff --git a/constraints-juju-29.txt b/constraints-juju-29.txt
new file mode 100644
index 000000000..6a3dead58
--- /dev/null
+++ b/constraints-juju-29.txt
@@ -0,0 +1 @@
+juju<3.0
diff --git a/constraints-juju-31.txt b/constraints-juju-31.txt
new file mode 100644
index 000000000..11c49ff22
--- /dev/null
+++ b/constraints-juju-31.txt
@@ -0,0 +1 @@
+juju>=3.1,<3.2
diff --git a/constraints-juju-32.txt b/constraints-juju-32.txt
new file mode 100644
index 000000000..6b5c57a94
--- /dev/null
+++ b/constraints-juju-32.txt
@@ -0,0 +1 @@
+juju>=3.2,<3.3
diff --git a/tox.ini b/tox.ini
index 2cb5a78d6..bd1ca067a 100644
--- a/tox.ini
+++ b/tox.ini
@@ -58,7 +58,9 @@ commands =
 
 [testenv:func-target]
 basepython = python3
-deps = -r{toxinidir}/test-requirements.txt
+deps = 
+    -c{toxinidir}/constraints-{env:EXTRA:juju-29}.txt
+    -r{toxinidir}/test-requirements.txt
 commands =
     {envdir}/bin/python3 setup.py install
     functest-run-suite --keep-model --bundle {posargs}