State of Python 2025: Web development makes a comeback

Despite all the innovation, the 2025 survey found a widespread and costly habit: the vast majority of developers are running outdated Python versions. 83% are missing out on the latest updates, with most saying their current version works just fine or that they simply haven’t had time to upgrade. Kennedy points out that this isn’t just about missing a few new features; it’s leaving serious performance gains on the table. An upgrade from Python 3.10, for example, could make code run about 42% faster without a single change.