diff --git a/tests/units/test_signed_commits.rb b/tests/units/test_signed_commits.rb
index f3c783c1..fe1f8d87 100644
--- a/tests/units/test_signed_commits.rb
+++ b/tests/units/test_signed_commits.rb
@@ -14,7 +14,7 @@ def in_repo_with_signing_config(&block)
     in_temp_dir do |path|
       `git init`
       ssh_key_file = File.expand_path(File.join('.git', 'test-key'))
-      `ssh-keygen -t dsa -N "" -C "test key" -f "#{ssh_key_file}"`
+      `ssh-keygen -t ed25519 -N "" -C "test key" -f "#{ssh_key_file}"`
       `git config --local gpg.format ssh`
       `git config --local user.signingkey #{ssh_key_file}.pub`