diff --git a/README.md b/README.md
index 242b1a4..12b0c28 100644
--- a/README.md
+++ b/README.md
@@ -1,6 +1,6 @@
 [![CI](https://github.com/michael-denyer/pyLocusZoom/actions/workflows/ci.yml/badge.svg)](https://github.com/michael-denyer/pyLocusZoom/actions/workflows/ci.yml)
+[![DOI](https://img.shields.io/badge/DOI-10.5281%2Fzenodo.22665975-orange)](https://doi.org/10.5281/zenodo.22665975)
 [![PyPI](https://img.shields.io/pypi/v/pylocuszoom)](https://pypi.org/project/pylocuszoom/)
-[![DOI](https://img.shields.io/badge/DOI-10.5281%2Fzenodo.22665975-blue)](https://doi.org/10.5281/zenodo.22665975)
 [![License: GPL v3](https://img.shields.io/badge/License-GPLv3-red.svg)](https://www.gnu.org/licenses/gpl-3.0)
 [![Python 3.10+](https://img.shields.io/badge/python-3.10+-blue.svg)](https://www.python.org/downloads/)
 [![Matplotlib](https://img.shields.io/badge/Matplotlib-3.5+-11557c.svg)](https://matplotlib.org/)
diff --git a/lychee.toml b/lychee.toml
index 3986eca..92e2e22 100644
--- a/lychee.toml
+++ b/lychee.toml
@@ -11,6 +11,10 @@ exclude = [
   # gnu.org aggressively rate-limits CI runner IPs. LICENSE.md is already
   # excluded via exclude_path; this catches inline GPL links in other docs.
   '^https?://www\.gnu\.org/licenses/',
+  # DOIs are persistent identifiers; the doi.org hop always resolves, and
+  # the Zenodo record page behind it has returned 504 during outages, which
+  # lychee reports as a redirect loop. Don't let a Zenodo outage block a commit.
+  '^https?://doi\.org/10\.5281/zenodo\.',
 ]
 
 exclude_path = [