The short answer is that your Open Source is always outdated. Rod Cope wrote a post recently on strategically watching for your Open Source becoming obsolete and looking for new trends to consider. However, you are likely already using tens or hundreds of Open Source packages daily and these packages are constantly updating, adding new features, increasing performance and fixing bugs. It is very important to keep aware of how the underlying technologies are changing and keep up to date to avoid headaches in the future when massive upgrades are required to play catch-up.