diff --git a/nbs/04_hierarchy.ipynb b/nbs/04_hierarchy.ipynb
index 8a1013e4..6d144ee2 100644
--- a/nbs/04_hierarchy.ipynb
+++ b/nbs/04_hierarchy.ipynb
@@ -2789,6 +2789,10 @@
    "display_name": "python3",
    "language": "python",
    "name": "python3"
+  },
+  "language_info": {
+   "name": "python",
+   "version": "3.9.13"
   }
  },
  "nbformat": 4,
diff --git a/nbs/15_arc.ipynb b/nbs/15_arc.ipynb
index f12ecd46..6b87773e 100644
--- a/nbs/15_arc.ipynb
+++ b/nbs/15_arc.ipynb
@@ -1023,6 +1023,10 @@
    "display_name": "python3",
    "language": "python",
    "name": "python3"
+  },
+  "language_info": {
+   "name": "python",
+   "version": "3.9.13"
   }
  },
  "nbformat": 4,
diff --git a/nbs/16_environment_processing.ipynb b/nbs/16_environment_processing.ipynb
index 49a6f82c..73e1e6c0 100644
--- a/nbs/16_environment_processing.ipynb
+++ b/nbs/16_environment_processing.ipynb
@@ -663,6 +663,10 @@
    "display_name": "python3",
    "language": "python",
    "name": "python3"
+  },
+  "language_info": {
+   "name": "python",
+   "version": "3.9.13"
   }
  },
  "nbformat": 4,