diff --git a/nginx/nginx.conf b/nginx/nginx.conf
index 609f83c..e184e91 100644
--- a/nginx/nginx.conf
+++ b/nginx/nginx.conf
@@ -27,6 +27,9 @@ http {
         ssl_certificate_key /certs/server.key;
         ssl_protocols TLSv1.2 TLSv1.3;
 
+        # Redirect plain HTTP requests to HTTPS
+        error_page 497 https://$host:$server_port$request_uri;
+
         location / {
             proxy_pass http://127.0.0.1:5000;
             proxy_set_header Host $host;