diff --git a/README.md b/README.md
index 7d401f5..08c57b1 100644
--- a/README.md
+++ b/README.md
@@ -4,7 +4,7 @@
 [![Python](https://img.shields.io/pypi/pyversions/decode?label=Python&color=cornflowerblue&style=flat-square)](https://pypi.org/project/decode/)
 [![Downloads](https://img.shields.io/pypi/dm/decode?label=Downloads&color=cornflowerblue&style=flat-square)](https://pepy.tech/project/decode)
 [![DOI](https://img.shields.io/badge/DOI-10.5281/zenodo.3384216-cornflowerblue?style=flat-square)](https://doi.org/10.5281/zenodo.3384216)
-[![Tests](https://img.shields.io/github/actions/workflow/status/deshima-dev/decode/tests.yml?label=Tests&style=flat-square)](https://github.com/deshima-dev/decode/actions)
+[![Tests](https://img.shields.io/github/actions/workflow/status/deshima-dev/decode/tests.yaml?label=Tests&style=flat-square)](https://github.com/deshima-dev/decode/actions)
 
 DESHIMA code for data analysis