diff --git a/extensions/ipynb/src/notebookSerializer.ts b/extensions/ipynb/src/notebookSerializer.ts
index 78e4bc31621..a9331529728 100644
--- a/extensions/ipynb/src/notebookSerializer.ts
+++ b/extensions/ipynb/src/notebookSerializer.ts
@@ -40,7 +40,7 @@ export class NotebookSerializer implements vscode.NotebookSerializer {
 			}
 		}
 
-		if (json.nbformat && json.nbformat < 5) {
+		if (json.nbformat && json.nbformat < 4) {
 			throw new Error('Only Jupyter notebooks version 4+ are supported');
 		}