diff --git a/README.md b/README.md
index 04e76f6f..6ada9736 100644
--- a/README.md
+++ b/README.md
@@ -1,5 +1,6 @@
 # flagger
 
+[![CII Best Practices](https://bestpractices.coreinfrastructure.org/projects/4783/badge)](https://bestpractices.coreinfrastructure.org/projects/4783)
 [![build](https://github.com/fluxcd/flagger/workflows/build/badge.svg)](https://github.com/fluxcd/flagger/actions)
 [![report](https://goreportcard.com/badge/github.com/fluxcd/flagger)](https://goreportcard.com/report/github.com/fluxcd/flagger)
 [![license](https://img.shields.io/github/license/fluxcd/flagger.svg)](https://github.com/fluxcd/flagger/blob/main/LICENSE)