diff --git a/asciinema/compose.yaml b/asciinema/compose.yaml
index bd30738..e88595d 100644
--- a/asciinema/compose.yaml
+++ b/asciinema/compose.yaml
@@ -18,6 +18,7 @@ services:
       SMTP_FROM_ADDRESS: ${EMAIL_FROM}
       SMTP_PORT: 587
       SMTP_TLS: always
+      SMTP_ALLOWED_TLS_VERSIONS: tlsv1.2,tlsv1.3
       SIGN_UP_DISABLED: ${ASCIINEMA_SIGN_UP_DISABLED:-false}
       DEFAULT_AVATAR: gravatar
     labels: