diff --git a/pyproject.toml b/pyproject.toml
index 1d034d4..7c66fb0 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -40,6 +40,7 @@ dependencies = [
     "bioio-ome-tiff",
     "loguru",
     "ms-peak-picker",
+    "findmfpy",
     "kdepy>=1.1.8",
     "perlin-noise==1.13",
     # TODO demote to optional again later, but necessary for pycharm right now