diff --git a/pyproject.toml b/pyproject.toml
index 7ca75b8ce8a28eab9ec7ec68eb011468a76c31a1..bbd96e6aa98c544f851764fc7ffc52522e42616a 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -53,9 +53,6 @@ zarr = "^2.14.0"
 omero = [ "omero-py" ]
 
 # Postprocessing
-[tool.poetry.group.pp]
-optional = true
-
 [tool.poetry.group.pp.dependencies]
 leidenalg = "^0.8.8"
 more-itertools = "^8.12.0"