diff --git a/README.md b/README.md
index c8832e1..c9c770b 100644
--- a/README.md
+++ b/README.md
@@ -29,7 +29,7 @@ You can consult the `values.yaml` file for the full range of options available t
 
 > **Note:** We try out best to follow `https://semver.org` so that it's clear patch, minor and major releases for breaking changes.
 
-[diagram]: https://github.com/drupalwxt/helm-drupal/blob/master/docs/diagram-drupal.pdf
+[diagram]: https://github.com/drupalwxt/helm-drupal/blob/main/docs/diagram-drupal.pdf
 [drupal]: drupal/README.md
 [helm]: https://helm.sh/
 [wxt]: https://drupalwxt.github.io