diff --git a/4-Classification/4-Applied/solution/notebook.ipynb b/4-Classification/4-Applied/solution/notebook.ipynb
index b9682048..5ed9da52 100644
--- a/4-Classification/4-Applied/solution/notebook.ipynb
+++ b/4-Classification/4-Applied/solution/notebook.ipynb
@@ -64,7 +64,7 @@
     }
    ],
    "source": [
-    "pip install skl2onnx"
+    "!pip install skl2onnx"
    ]
   },
   {