diff --git a/nodepool/elements/infra-package-needs/pkg-map b/nodepool/elements/infra-package-needs/pkg-map
index 39efb7fc89..184fe61051 100644
--- a/nodepool/elements/infra-package-needs/pkg-map
+++ b/nodepool/elements/infra-package-needs/pkg-map
@@ -10,7 +10,8 @@
     "ubuntu": {
       "focal": {
         "ntp": "",
-        "ntpdate": ""
+        "ntpdate": "",
+        "python-dev": ""
       }
    }
   },
diff --git a/tox.ini b/tox.ini
index bf58e116b0..610c3f1285 100644
--- a/tox.ini
+++ b/tox.ini
@@ -109,6 +109,7 @@ commands = {toxinidir}/specs/generate_specs_site.py {toxinidir}/specs/specs.yaml
 [testenv:dib]
 deps =
    diskimage-builder
+   yamllint
 changedir = {toxinidir}/nodepool
 commands = env ELEMENTS_DIR=elements dib-lint