diff --git a/tutorials/4.knowledge-graphs.ipynb b/tutorials/4.knowledge-graphs.ipynb
index d5f6673..e4f3882 100644
--- a/tutorials/4.knowledge-graphs.ipynb
+++ b/tutorials/4.knowledge-graphs.ipynb
@@ -74,7 +74,7 @@
    "cell_type": "markdown",
    "metadata": {},
    "source": [
-    "Install the Graphviz based on your operation system https://graphviz.org/download/"
+    "Install Graphviz based on your operation system https://graphviz.org/download/"
    ]
   },
   {
@@ -415,11 +415,6 @@
     "        return display(dot)\n"
    ]
   },
-  {
-   "cell_type": "markdown",
-   "metadata": {},
-   "source": []
-  },
   {
    "cell_type": "markdown",
    "metadata": {},
@@ -593,7 +588,7 @@
  ],
  "metadata": {
   "kernelspec": {
-   "display_name": "Python 3",
+   "display_name": "Python 3 (ipykernel)",
    "language": "python",
    "name": "python3"
   },
@@ -611,5 +606,5 @@
   }
  },
  "nbformat": 4,
- "nbformat_minor": 2
+ "nbformat_minor": 4
 }