diff --git a/docs/index.md b/docs/index.md
index be9b75b..578d426 100644
--- a/docs/index.md
+++ b/docs/index.md
@@ -86,7 +86,7 @@ compose.exec('node', 'npm install', { cwd: path.join(__dirname) })
 While `docker-compose` runs on Node.js 6+, running the tests requires you to use Node.js 8 as they make use of `async/await`.
 
 ```
-npm test
+yarn test
 ```
 
 ## Want to help?
diff --git a/readme.md b/readme.md
index 23e7dac..f699386 100644
--- a/readme.md
+++ b/readme.md
@@ -82,7 +82,7 @@ compose.exec('node', 'npm install', { cwd: path.join(__dirname) })
 While `docker-compose` runs on Node.js 6+, running the tests requires you to use Node.js 8 as they make use of `async/await`.
 
 ```
-npm test
+yarn test
 ```
 
 ## Want to help?