--- a/Gemfile
+++ b/Gemfile
@@ -399,7 +399,7 @@
 # Required for ED25519 SSH host key support
 group :ed25519 do
   gem 'rbnacl-libsodium'
-  gem 'rbnacl', '~> 4.0'
+  gem 'rbnacl', '~> 5.0'
   gem 'bcrypt_pbkdf', '~> 1.0'
 end