diff --git a/appveyor.yml b/appveyor.yml
index 31f2505a..e60efad5 100644
--- a/appveyor.yml
+++ b/appveyor.yml
@@ -7,6 +7,7 @@ install:
   # Get the latest stable version of Node.js or io.js
   - ps: Install-Product node $env:nodejs_version
   # install modules
+  - npm install -g npm@5.7
   - npm install
 
 # Post-install test scripts.