diff --git a/nginx.conf b/nginx.conf
index 5b18d66..c5761de 100644
--- a/nginx.conf
+++ b/nginx.conf
@@ -44,6 +44,9 @@ http {
         # Restrict to modern TLS to avoid handshake issues
         ssl_protocols TLSv1.2 TLSv1.3; # Drop TLSv1.0/1.1
         ssl_prefer_server_ciphers on;
+        # Harden cipher suite and ECDH curves (mitigate bad key share)
+        ssl_ciphers 'ECDHE-ECDSA-AES128-GCM-SHA256:ECDHE-RSA-AES128-GCM-SHA256:ECDHE-ECDSA-AES256-GCM-SHA384:ECDHE-RSA-AES256-GCM-SHA384:ECDHE-ECDSA-CHACHA20-POLY1305:ECDHE-RSA-CHACHA20-POLY1305';
+        ssl_ecdh_curve X25519:secp256r1;
 
         ##
         # Logging Settings