diff --git a/tox.ini b/tox.ini
index ca2522a..659f20d 100644
--- a/tox.ini
+++ b/tox.ini
@@ -105,3 +105,11 @@
   bash
 commands =
   bash {toxinidir}/build/build-manila-image.sh
+
+[testenv:promtool-test]
+skip_install = true
+deps =
+  PyYAML
+  rjsonnet
+commands =
+  python3 {toxinidir}/hack/promtool-test.py