--- a/docs/conf.py
+++ b/docs/conf.py
@@ -28,7 +28,6 @@ needs_sphinx = "8.1"
 # extensions coming with Sphinx (named 'sphinx.ext.*') or your custom
 # ones.
 extensions = [
-    "dater",
     "sphinx.ext.autodoc",
     "sphinx.ext.extlinks",
     "sphinx.ext.intersphinx",