diff --git a/argocd/applications/firefly-iii.yaml b/argocd/applications/firefly-iii.yaml
index 2610ce4..64baa1b 100644
--- a/argocd/applications/firefly-iii.yaml
+++ b/argocd/applications/firefly-iii.yaml
@@ -11,3 +11,6 @@ spec:
     path: firefly-iii
     repoURL: https://git.pyrocufflink.blue/infra/kubernetes.git
     targetRevision: master
+  syncPolicy:
+    automated:
+      prune: true