diff --git a/docs/requirements.txt b/docs/requirements.txt
index f2764237..10030239 100644
--- a/docs/requirements.txt
+++ b/docs/requirements.txt
@@ -22,4 +22,5 @@ setuptools==65.2.0
 dask[distributed]==2022.9.1
 pre-commit==2.20.0
 importlib==1.0.4
-importlib-metadata==5.1.0
+importlib-metadata==5.1.0
+trollsift==0.5.0