Python 3 used by default in all our runtimes from December 1st, 2025

Last year, we moved the Python runtime default from 2.x to 3.x. Starting December 1st, 2025, Python 3.x will also become the default for all other runtimes. If you still need to use Python 2.7, you must explicitly set CC_PYTHON_VERSION=2 in your application settings.