diff --git a/requirements.txt b/requirements.txt
index 61ad0091..21f64e3d 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -30,4 +30,5 @@ kaleido
 numpy>=1.25.0 # test suite will fail if user installed lower than this
 sphinx
 sphinx-rtd-theme
+osmium
 -e .