Memory Issue during compiling less with grunt

i'm currently using bower + grunt to build my website.

dependencies in bower.json:

  "dependencies": {
    "jquery": "~2.1.3",
    "bootstrap": "~3.3.2",
    "admin-lte": "~2.0.0"
  },

dependecies in my package.json:

  "dependencies": {
    "grunt": "^0.4.5",
    "grunt-bower-concat": "^0.4.0"
  },
  "devDependencies": {
    "grunt": "^0.4.5",
    "grunt-contrib-concat": "^0.5.1",
    "grunt-contrib-copy": "^0.7.0",
    "grunt-contrib-cssmin": "^0.12.2",
    "grunt-contrib-less": "^1.0.0",
    "grunt-contrib-uglify": "^0.7.0",
    "grunt-contrib-watch": "^0.6.1",
    "grunt-filerev": "^2.2.0",
    "grunt-usemin": "^3.0.0"
  },

I was using AdminLTE 1.4.* and all was fine. I updated to AdminLTE 2.0.0 and when I try to compile my less file I receive this error:

FATAL ERROR: CALL_AND_RETRY_LAST Allocation failed - process out of memory

I have my base.less file that include just bootstrap ad Adminlte stylesheets. If I exclude some files from the imports of adminlte.less file (bootstrap variables and mixins and all the skins) it compiles with no error, but I need to import the skins too :)

How can I fix it?