diff --git a/pyproject.toml b/pyproject.toml
index 219019f..a5243e4 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -30,5 +30,5 @@ dependencies = [
     "google-genai>=2.14.0",
     "pillow>=12.3.0",
     "scikit-learn>=1.9.0",
-    "skl2onnx>=0.5.0",
+    "skl2onnx>=1.20.0",
 ]