diff --git a/scripts/cross/Dockerfile b/scripts/cross/Dockerfile
index 968c0f01a1..997343b048 100644
--- a/scripts/cross/Dockerfile
+++ b/scripts/cross/Dockerfile
@@ -12,12 +12,14 @@ RUN apt-get update -y && apt-get install --no-install-recommends -y -q \
                          libltdl-dev \
                          libltdl7
 
-RUN curl -sL https://deb.nodesource.com/setup_8.x | bash -
-RUN apt-get install -y nodejs npm
+RUN curl -sL https://deb.nodesource.com/setup_10.x | bash -
+RUN curl -sL https://dl.yarnpkg.com/debian/pubkey.gpg | apt-key add -
+RUN echo "deb https://dl.yarnpkg.com/debian/ stable main" | tee /etc/apt/sources.list.d/yarn.list
+
+RUN apt-get update -y && apt-get install nodejs yarn=1.12.1-1
 
 RUN rm -rf /var/lib/apt/lists/*
 
-RUN npm install -g yarn@1.12.1
 
 ENV GOVERSION 1.11.5
 RUN mkdir /goroot && mkdir /gopath
diff --git a/ui/.nvmrc b/ui/.nvmrc
index 368fe859d7..e338b86593 100644
--- a/ui/.nvmrc
+++ b/ui/.nvmrc
@@ -1 +1 @@
-v8.12.0
+v10
diff --git a/ui/scripts/start-vault.js b/ui/scripts/start-vault.js
index 25479512bb..de2c2f8d61 100755
--- a/ui/scripts/start-vault.js
+++ b/ui/scripts/start-vault.js
@@ -71,4 +71,7 @@ process.on('exit', function() {
   vault.kill('SIGINT');
 });
 
-fs.writeFile(pidFile, process.pid);
+fs.writeFile(pidFile, process.pid, (err) => {
+  if (err) throw err;
+  console.log('The file has been saved!');
+});