diff --git a/src/spikeinterface_pipelines/spikesorting/params.py b/src/spikeinterface_pipelines/spikesorting/params.py
index 25edb4b..255cd34 100644
--- a/src/spikeinterface_pipelines/spikesorting/params.py
+++ b/src/spikeinterface_pipelines/spikesorting/params.py
@@ -59,9 +59,6 @@ class Kilosort3Model(BaseModel):
     model_config = ConfigDict(extra="forbid")
     pass
 
-class Kilosort4Model(BaseModel):
-    model_config = ConfigDict(extra="forbid")
-    pass
 
 class MountainSort5Model(BaseModel):
     model_config = ConfigDict(extra="forbid")