diff --git a/argocd/apps/openproject/openproject.yaml b/argocd/apps/openproject/openproject.yaml
index 766018c..85783ff 100644
--- a/argocd/apps/openproject/openproject.yaml
+++ b/argocd/apps/openproject/openproject.yaml
@@ -30,6 +30,8 @@ spec:
           forceString: true
         - name: ingress.annotations.cert-manager\.io\/cluster-issuer
           value: lets-encrypt-staging
+        - name: 'persistence.accessMode'
+          value: 'ReadWriteOnce'
     chart: openproject
   destination:
     server: 'https://kubernetes.default.svc'