diff --git a/lib/esbonio-extensions/tests/data/tutorial/doctest_no_output.ipynb b/lib/esbonio-extensions/tests/data/tutorial/doctest_no_output.ipynb
index 36b853988..51e2781e0 100644
--- a/lib/esbonio-extensions/tests/data/tutorial/doctest_no_output.ipynb
+++ b/lib/esbonio-extensions/tests/data/tutorial/doctest_no_output.ipynb
@@ -1,17 +1,17 @@
 {
-    "cells": [
-        {
-            "cell_type": "code",
-            "execution_count": null,
-            "metadata": {},
-            "outputs": [],
-            "source": [
-                "l = [1,2,3]\n",
-                "l.append(4)"
-            ]
-        }
-    ],
-    "metadata": {},
-    "nbformat": 4,
-    "nbformat_minor": 4
+ "cells": [
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "metadata": {},
+   "outputs": [],
+   "source": [
+    "l = [1, 2, 3]\n",
+    "l.append(4)"
+   ]
+  }
+ ],
+ "metadata": {},
+ "nbformat": 4,
+ "nbformat_minor": 4
 }