diff --git a/_quarto.yml b/_quarto.yml
index b70e7fe62..ae29ed75a 100644
--- a/_quarto.yml
+++ b/_quarto.yml
@@ -341,7 +341,7 @@ format:
       file: custom.html
     link-external-icon: true
     link-external-newwindow: true
-    link-external-filter: '^(?:http:|https:)\/\/documentation.*dataspace.copernicus\/custom'
+    link-external-filter: '^(?:http:|https:)\/\/(documentation.dataspace.copernicus.eu|eu-cdse.github.io)\/'
 bread-crumbs: true
 ipynb-filters:
   - notebook_filter.py