diff --git a/static/Caddyfile b/static/Caddyfile
index 19d933a..6fe326b 100644
--- a/static/Caddyfile
+++ b/static/Caddyfile
@@ -25,7 +25,7 @@ http://static-mat-services.fly.dev/ {
     Permissions-Policy interest-cohort=()
     # enable HSTS
     # currently ramping up max-age as per https://hstspreload.org/
-    Strict-Transport-Security max-age=300; includeSubDomains
+    Strict-Transport-Security max-age=604800; includeSubDomains
     # disable clients from sniffing the media type
     X-Content-Type-Options nosniff
     # clickjacking protection