diff --git a/pyproject.toml b/pyproject.toml
index f41ecc34d..4c9315722 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -93,7 +93,6 @@ igorproio = ["igor2"]
 kwikio = ["klusta"]
 neomatlabio = ["scipy>=1.0.0"]
 nixio = ["nixio>=1.5.0"]
-stimfitio = ["stfio"]
 tiffio = ["pillow"]
 edf = ["pyedflib"]
 ced = ["sonpy"]