diff --git a/k8s/infra/forgejo-runner/templates/gc-cronjob.yaml b/k8s/infra/forgejo-runner/templates/gc-cronjob.yaml
index bed8ce8..abec800 100644
--- a/k8s/infra/forgejo-runner/templates/gc-cronjob.yaml
+++ b/k8s/infra/forgejo-runner/templates/gc-cronjob.yaml
@@ -43,7 +43,7 @@ metadata:
   labels:
     app: forgejo-runner-gc
 spec:
-  schedule: "0 2,5 * * *"      # Run at 02:00 and 05:00 UTC (more frequent for heavy build workloads)
+  schedule: {{ .Values.gc.schedule | quote }}
   concurrencyPolicy: Forbid
   successfulJobsHistoryLimit: 3
   failedJobsHistoryLimit: 3
diff --git a/k8s/infra/forgejo-runner/values.yaml b/k8s/infra/forgejo-runner/values.yaml
index f4e90f0..7f18371 100644
--- a/k8s/infra/forgejo-runner/values.yaml
+++ b/k8s/infra/forgejo-runner/values.yaml
@@ -59,7 +59,7 @@ nodeSelector:
 # disable in per-runner overrides so it renders once.
 gc:
   enabled: true
-  schedule: "0 3 * * *"        # daily 03:00 UTC
+  schedule: "*/30 * * * *"     # every 30 minutes
   image: alpine/k8s:1.31.0
   pruneAge: "72h"              # Docker artifacts unused longer than this get pruned
   pruneAgeHours: 72             # Same as pruneAge but numeric for date arithmetic in shell