diff --git a/Readme.md b/Readme.md
index 50e94a0..6fda26a 100644
--- a/Readme.md
+++ b/Readme.md
@@ -101,7 +101,7 @@ testosterone
   })
 
   .run(function () {
-    require('sys').print('All tests passed!');
+    require('util').print('All tests passed!');
   });
 
 // Output
@@ -150,7 +150,7 @@ testosterone
   })
 
   .run(function () {
-    require('sys').print('done!');
+    require('util').print('done!');
   });
 
 // Output
diff --git a/tests/serial.js b/tests/serial.js
index 3d7f1b8..adfcbae 100644
--- a/tests/serial.js
+++ b/tests/serial.js
@@ -49,5 +49,5 @@ testosterone
   )
 
   .run(function () {
-    require('sys').print('done!');
+    require('util').print('done!');
   });
diff --git a/tests/stubs.js b/tests/stubs.js
index 9eb83db..aef929f 100644
--- a/tests/stubs.js
+++ b/tests/stubs.js
@@ -31,5 +31,5 @@ testosterone
   })
 
   .run(function () {
-    require('sys').print('done!');
+    require('util').print('done!');
   });