diff --git a/phoenix_static_buildpack.config b/phoenix_static_buildpack.config
index df85d9f..1d31746 100644
--- a/phoenix_static_buildpack.config
+++ b/phoenix_static_buildpack.config
@@ -1,2 +1,3 @@
 # Avoid Webpack Errors by using latest node:
 node_version=12.16.1
+npm_version=6.13.4