diff --git a/.kokoro/test.bat b/.kokoro/test.bat
index 93727bb..d604736 100644
--- a/.kokoro/test.bat
+++ b/.kokoro/test.bat
@@ -17,7 +17,7 @@
 cd /d %~dp0
 cd ..
 
-call npm install -g npm@6 || goto :error
+call npm install -g npm@5 || goto :error
 
 call npm install || goto :error
 call npm run test || goto :error