bin/sidekiqctl in sidekiq-3.4.2 vs bin/sidekiqctl in sidekiq-3.5.0

@@ -58,24 +58,24 @@
   def pid
     @pid ||= File.read(pidfile).to_i
   end
 
   def quiet
-    `kill -USR1 #{pid}`
+    Process.kill(:USR1, pid)
   end
 
   def stop
-    `kill -TERM #{pid}`
+    Process.kill(:TERM, pid)
     kill_timeout.times do
       begin
         Process.getpgid(pid)
       rescue Errno::ESRCH
         FileUtils.rm_f pidfile
         done 'Sidekiq shut down gracefully.'
       end
       sleep 1
     end
-    `kill -9 #{pid}`
+    Process.kill(:KILL, pid)
     FileUtils.rm_f pidfile
     done 'Sidekiq shut down forcefully.'
   end
   alias_method :shutdown, :stop
 end