nuxeo-ui-elements-10.10 build fails

10:50:25 [nuxeo-ui-elements-10.10] $ /bin/bash -xe /tmp/jenkins8610689389460842575.sh
10:50:25 + PATH=/opt/build/tools/node-v6.4.0-linux-x64/bin:/opt/jenkins/.gem/ruby/2.5.0/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/snap/bin
10:50:25 + npm cache clean
10:50:25 + bower cache clean
10:50:27 bower deleted       Cached package es6-promise: 
...
10:52:42 Polymer CLI requires at least Node v8.0. You have v6.4.0.
10:52:42 See https://www.polymer-project.org/2.0/docs/tools/node-support for details.
10:52:42 
10:52:42 npm ERR! Linux 4.4.0-96-generic
10:52:42 npm ERR! argv "/opt/build/tools/node-v6.4.0-linux-x64/bin/node" "/opt/build/tools/node-v6.4.0-linux-x64/bin/npm" "run" "test"
10:52:42 npm ERR! node v6.4.0
10:52:42 npm ERR! npm  v3.10.7
10:52:42 npm ERR! code ELIFECYCLE
10:52:42 npm ERR! nuxeo-ui-elements@2.4.0 test: `polymer test --simpleOutput --expanded -l chrome`
10:52:42 npm ERR! Exit status 1
10:52:42 npm ERR! 
10:52:42 npm ERR! Failed at the nuxeo-ui-elements@2.4.0 test script 'polymer test --simpleOutput --expanded -l chrome'.
10:52:42 npm ERR! Make sure you have the latest version of node.js and npm installed.
10:52:42 npm ERR! If you do, this is most likely a problem with the nuxeo-ui-elements package,
10:52:42 npm ERR! not with npm itself.
10:52:42 npm ERR! Tell the author that this fails on your system:
10:52:42 npm ERR!     polymer test --simpleOutput --expanded -l chrome
10:52:42 npm ERR! You can get information on how to open an issue for this project with:
10:52:42 npm ERR!     npm bugs nuxeo-ui-elements
10:52:42 npm ERR! Or if that isn't available, you can get their info via:
10:52:42 npm ERR!     npm owner ls nuxeo-ui-elements
10:52:42 npm ERR! There is likely additional logging output above.
10:52:42 
10:52:42 npm ERR! Please include the following file with any support request:
10:52:42 npm ERR!     /opt/jenkins/workspace/10.10/nuxeo-ui-elements-10.10/npm-debug.log
10:52:42 Build step 'Execute shell' marked build as failure