diff --git a/boring-nginx/ssl_params b/boring-nginx/ssl_params
index 7384056..fd080c5 100644
--- a/boring-nginx/ssl_params
+++ b/boring-nginx/ssl_params
@@ -1,5 +1,5 @@
 ssl_protocols TLSv1.2;
-ssl_ecdh_curve X25519:P-384;
+ssl_ecdh_curve X25519:P-521:P-384;
 ssl_ciphers CECPQ1-ECDSA-AES256-GCM-SHA384:CECPQ1-RSA-AES256-GCM-SHA384:[ECDHE-ECDSA-CHACHA20-POLY1305|ECDHE-RSA-CHACHA20-POLY1305|ECDHE-ECDSA-CHACHA20-POLY1305-D|ECDHE-RSA-CHACHA20-POLY1305-D|ECDHE-ECDSA-AES256-GCM-SHA384|ECDHE-RSA-AES256-GCM-SHA384]:ECDHE-ECDSA-AES128-GCM-SHA256:ECDHE-RSA-AES128-GCM-SHA256;
 ssl_prefer_server_ciphers on;