diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index bb2a2a8..825766d 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -18,9 +18,10 @@ jobs:
           - "3.2"
           - "3.3"
           - "3.4"
+          - "4.0"
 
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v7
       - name: Set up Ruby
         uses: ruby/setup-ruby@v1
         with:
diff --git a/Rakefile b/Rakefile
index f32601d..78567a7 100644
--- a/Rakefile
+++ b/Rakefile
@@ -3,7 +3,11 @@
 require "bundler/gem_tasks"
 require "minitest/test_task"
 
-Minitest::TestTask.create
+Minitest::TestTask.create do |t|
+  # Capistrano 3.20 emits circular require warnings under Ruby 3.4 with -w.
+  # Keep test output clean until upstream fixes the warning path.
+  t.warning = false
+end
 
 require "standard/rake"
 
diff --git a/lib/capistrano/solid_queue.rb b/lib/capistrano/solid_queue.rb
index 3235d12..b270890 100644
--- a/lib/capistrano/solid_queue.rb
+++ b/lib/capistrano/solid_queue.rb
@@ -30,7 +30,7 @@ def execute_systemd(*args, raise_on_non_zero_exit: true)
 
       def sudo_if_needed(*command, raise_on_non_zero_exit: true)
         if fetch(:solid_queue_systemctl_user) == :system
-          backend.sudo command.map(&:to_s).join(" ")
+          backend.sudo command.join(" ")
         else
           backend.execute(*command, raise_on_non_zero_exit: raise_on_non_zero_exit)
         end