diff --git a/templates/gitea/config.yaml b/templates/gitea/config.yaml
index ab4832d..983014d 100644
--- a/templates/gitea/config.yaml
+++ b/templates/gitea/config.yaml
@@ -17,6 +17,12 @@ metadata:
 type: Opaque
 stringData:
   assertions: |
+
+{{- /*assert that only one PG dep is enabled */ -}}
+{{- if and (.Values.gitea.postgresql.enabled) (index (.Values.gitea "postgresql-ha" "enabled")) -}}
+  {{- fail "Only one of postgresql or postgresql-ha can be enabled at the same time." -}}
+{{- end }}
+
 {{- /* multiple replicas assertions */ -}}
 {{- if gt .Values.replicaCount 1.0 -}}
   {{- if .Values.gitea.config.cron.GIT_GC_REPOS -}}
@@ -24,10 +30,11 @@ stringData:
       {{- fail "Invoking the garbage collector via CRON is not yet supported when running with multiple replicas. Please set 'GIT_GC_REPOS.enabled = false'." -}}
     {{- end }}
   {{- end }}
+
   {{- if eq (first .Values.persistence.accessModes) "ReadWriteOnce" -}}
     {{- fail "When using multiple replicas, a RWX file system is required and gitea.persistence.accessModes[0] must be set to ReadWriteMany." -}}
   {{- end }}
-  
+
   {{- if eq (get .Values.gitea.config.indexer "ISSUE_INDEXER_TYPE") "bleve" -}}
     {{- fail "When using multiple replicas, the issue indexer (gitea.config.indexer.ISSUE_INDEXER_TYPE) must be set to a HA-ready provider such as 'meilisearch', 'elasticsearch' or 'db' (if the DB is HA-ready)." -}}
   {{- end }}