diff --git a/charms/horizon-k8s/tox.ini b/charms/horizon-k8s/tox.ini
index a2e52c68..671cda90 100644
--- a/charms/horizon-k8s/tox.ini
+++ b/charms/horizon-k8s/tox.ini
@@ -75,6 +75,10 @@ deps = {[testenv:py3]deps}
 basepython = python3.10
 deps = {[testenv:py3]deps}
 
+[testenv:py311]
+basepython = python3.11
+deps = {[testenv:py3]deps}
+
 [testenv:cover]
 basepython = python3
 deps = {[testenv:py3]deps}