diff --git a/pyproject.toml b/pyproject.toml
index e0b8ecf..977e584 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -28,7 +28,7 @@ cyclopts = "^2.0.0"
 numpy = "*"
 nibabel = "*"
 zarr = "^2.0.0"
-wkw = "*" 
+
 
 [tool.poetry.group.df]
 optional = true
@@ -46,6 +46,11 @@ optional = true
 h5py = "*"
 scipy = "*"
 
+[tool.poetry.group.wk]
+optional = true
+[tool.poetry.group.wk.dependencies]
+wkw = "*" 
+
 [tool.poetry.group.dev]
 optional = true
 [tool.poetry.group.dev.dependencies]