diff --git a/pyproject.toml b/pyproject.toml
index 9b1416d237754b3cc3a88995779333ee47931176..ca4c12b859dc838fcf6e8a9b3e0ba4271bd0bfee 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -46,6 +46,7 @@ parallel = [
 doc = [
     "sphinx<8.2",
     "pydata-sphinx-theme",
+    "sphinxcontrib-bibtex",
     "myst-parser",
     "jupyter",
     "nbconvert",