diff --git a/00_index.ipynb b/00_index.ipynb
index 5fd4ad5f..13143226 100644
--- a/00_index.ipynb
+++ b/00_index.ipynb
@@ -6,35 +6,35 @@
    "source": [
     "# Introduction\n",
     "\n",
-    "- [Introduction to the tutorial](./00-intro.ipynb)\n",
+    "- [Introduction to the tutorial](./00_intro.ipynb)\n",
     "\n",
     "# Basic Tutorial\n",
     "\n",
-    "- [Basic datatypes](./01-basic_datatypes.ipynb)\n",
-    "- [Control Flow](./02-control_flow.ipynb)\n",
-    "- [Functions](./03-functions.ipynb)\n",
-    "- [Input-Output](./04-input_output.ipynb)\n",
-    "- [Object-oriented programming](./05-object_oriented_programming.ipynb)\n",
-    "- [Modules and packages](./06-modules_and_packages.ipynb)\n",
+    "- [Basic datatypes](./01_basic_datatypes.ipynb)\n",
+    "- [Control Flow](./02_control_flow.ipynb)\n",
+    "- [Functions](./03_functions.ipynb)\n",
+    "- [Input-Output](./04_input_output.ipynb)\n",
+    "- [Object-oriented programming](./05_object_oriented_programming.ipynb)\n",
+    "- [Modules and packages](./06_modules_and_packages.ipynb)\n",
     "\n",
     "# Advanced tutorial\n",
     "\n",
-    "- [Manage Python project](./10-manage_python_project.ipynb)\n",
-    "- [Functional programming](./11-functional_programming.ipynb)\n",
-    "- [Advanced functions](./12-functions_advanced.ipynb)\n",
-    "- [Advanced Object-oriented programming](./13-object_oriented_programming_advanced.ipynb)\n",
+    "- [Manage Python project](./10_manage_python_project.ipynb)\n",
+    "- [Functional programming](./11_functional_programming.ipynb)\n",
+    "- [Advanced functions](./12_functions_advanced.ipynb)\n",
+    "- [Advanced Object-oriented programming](./13_object_oriented_programming_advanced.ipynb)\n",
     "\n",
     "# Libraries\n",
     "\n",
-    "- [Matplotlib](./20-library_matplotlib.ipynb)\n",
-    "- [NumPy](./21-library_numpy.ipynb)\n",
-    "- [scikit-learn](./22-library_sklearn.ipynb)\n",
-    "- [SciPy](./23-library_scipy.ipynb)\n",
-    "- [Pandas](./24-library_pandas.ipynb)\n",
+    "- [Matplotlib](./20_library_matplotlib.ipynb)\n",
+    "- [NumPy](./21_library_numpy.ipynb)\n",
+    "- [scikit-learn](./22_library_sklearn.ipynb)\n",
+    "- [SciPy](./23_library_scipy.ipynb)\n",
+    "- [Pandas](./24_library_pandas.ipynb)\n",
     "\n",
     "# Additional Topics\n",
     "\n",
-    "- [Parallelism and concurrency in Python](./14-threads.ipynb)\n"
+    "- [Parallelism and concurrency in Python](./14_threads.ipynb)\n"
    ]
   }
  ],
@@ -54,7 +54,7 @@
    "name": "python",
    "nbconvert_exporter": "python",
    "pygments_lexer": "ipython3",
-   "version": "3.12.0"
+   "version": "3.10.10"
   }
  },
  "nbformat": 4,