diff --git a/testing/hosts/default/etc/ssh/sshd_config b/testing/hosts/default/etc/ssh/sshd_config
index f4ced3e374..700c7caaf7 100644
--- a/testing/hosts/default/etc/ssh/sshd_config
+++ b/testing/hosts/default/etc/ssh/sshd_config
@@ -1,6 +1,7 @@
 Port 22
 Protocol 2
 Ciphers aes128-gcm@openssh.com
+KexAlgorithms curve25519-sha256
 HostKey /etc/ssh/ssh_host_rsa_key
 HostKey /etc/ssh/ssh_host_ecdsa_key
 PermitRootLogin yes