diff --git a/.pre-commit-config.yaml b/.pre-commit-config.yaml
index 76eec5d..5bcfcaa 100644
--- a/.pre-commit-config.yaml
+++ b/.pre-commit-config.yaml
@@ -1,7 +1,7 @@
 ---
 repos:
 - repo: https://github.com/adrienverge/yamllint.git
-  rev: v1.17.0
+  rev: v1.26.3
   hooks:
     - id: yamllint
       args: [-c=.yamllint.yaml]
diff --git a/helm/values.yaml b/helm/values.yaml
index 7a882b6..a7b869b 100644
--- a/helm/values.yaml
+++ b/helm/values.yaml
@@ -19,6 +19,10 @@ daskhub:
         name: pcccr.azurecr.io/jupyterhub/k8s-hub
         tag: "1.0.1.post0"
 
+      cull:
+        enabled: true
+        maxAge: 86400  # 24 hours
+
       config:
         JupyterHub:
           admin_access: false