Currently the unstable version of Node.js running on Travis CI is v0.11.3 (26 Jun 2013).
The most recent release of the unstable Node is v0.11.5 (07 Aug 2013).
An upgrade is necessary to test the projects against the most recent Node features, otherwise a test tends to fail (an example of v0.11.4 code failing on v0.11.3).
Currently the unstable version of Node.js running on Travis CI is v0.11.3 (26 Jun 2013).
The most recent release of the unstable Node is v0.11.5 (07 Aug 2013).
An upgrade is necessary to test the projects against the most recent Node features, otherwise a test tends to fail (an example of v0.11.4 code failing on v0.11.3).