diff --git a/Rakefile b/Rakefile
index 11ba867..9498b97 100644
--- a/Rakefile
+++ b/Rakefile
@@ -13,15 +13,17 @@ namespace :spec do
     targets << target
   end
 
-  task :all     => targets
+  # Use multitask for parallel execution
+  multitask :all     => targets
   task :default => :all
 
   targets.each do |target|
     original_target = target == "_default" ? target[1..-1] : target
     desc "Run serverspec tests to #{original_target}"
-    RSpec::Core::RakeTask.new(target.to_sym) do |t|
-      ENV['TARGET_HOST'] = original_target
-      t.pattern = "spec/#{original_target}/*_spec.rb"
+    task target.to_sym do
+      # Run RSpec in a separate process with environment variable set
+      # This ensures each parallel task has its own isolated environment
+      sh "TARGET_HOST=#{original_target} bundle exec rspec spec/#{original_target}/*_spec.rb"
     end
   end
 end