diff --git a/pyproject.toml b/pyproject.toml
index a23145f..449310e 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -55,6 +55,10 @@ gui = [
     "napari>=0.4.18",
     "ome-zarr>=0.8",
 ]
+flatfield = [
+    "basicpy @ git+https://github.com/QI2lab/BaSiCPy.git",
+    "matplotlib>=3.5",
+]
 dev = [
     "pytest>=7.0",
     "pytest-cov>=4.0",
@@ -63,7 +67,7 @@ dev = [
     "mypy>=1.0",
 ]
 all = [
-    "tilefusion[gpu,gui,dev]",
+    "tilefusion[gpu,gui,flatfield,dev]",
 ]
 
 [project.scripts]