diff --git a/infra/gitea/Dockerfile b/infra/gitea/Dockerfile
index 465825e..be53c44 100644
--- a/infra/gitea/Dockerfile
+++ b/infra/gitea/Dockerfile
@@ -1,4 +1,4 @@
-# syntax=docker/dockerfile:1.7
+# syntax=docker/dockerfile:1.28
 # =============================================================================
 # Gitea with fhirworx theme compiled in.
 #