diff --git a/docs/requirements.txt b/docs/requirements.txt
index 4d94b4a8..cc2f7252 100644
--- a/docs/requirements.txt
+++ b/docs/requirements.txt
@@ -1,6 +1,7 @@
 docutils
 ipykernel
 jupyter-sphinx
+pyarrow
 sphinx >=3.5.4
 sphinx-audeering-theme >=1.2.1
 sphinx-autodoc-typehints