Hey everyone! 
We’re excited to announce that Core is now officially 1.0! 
Today’s release is the result of five years of invention and refinement, culminating in this rock-solid, stable release. We’ve been stabilizing interfaces, improving performance, and removing deprecated features, in particular:
- Authentication with tokens has been removed; finalizing the transition to API keys
- Python 3.6 is no longer supported. Python 3.7 is now the minimum version.
- Flow
Environmentshave been removed; finalizing the transition toRunConfigs
We’ve written a handy upgrade guide to help you make the transition. Learn more about other breaking changes and refinements in the changelog and how this release fits in the broader progression in the blog post:
Big thanks 
to everyone who downloaded the Release candidate for Prefect Core 1.0 and provided feedback.
Even bigger thanks to those who contributed enhancements and tasks to this release, including:
- Alessandro Lollo
- Aneesh Makala
- Connor Martin
- Gebing
- Julio Faracco
- Kevin Mullins
- Mathijs Miermans
- Oliver Mannion
- Raymond Yu
The latest Docker image now points to Prefect 1.0 as well!
Happy Engineering!