diff --git a/doc/requirements.txt b/doc/requirements.txt
index 2faa4de0..07489bbe 100644
--- a/doc/requirements.txt
+++ b/doc/requirements.txt
@@ -2,6 +2,9 @@ ipykernel
 numpy
 matplotlib
 pandas
+# setuptools seems to be needed for pybtex, see
+# https://github.com/mcmtroffaes/sphinxcontrib-bibtex/issues/345:
+setuptools
 sphinxcontrib-bibtex>=2.1
 sphinxcontrib-svg2pdfconverter
 ipywidgets