diff --git a/lecture_3.ipynb b/lecture_3.ipynb
index 0f851af..7e1ca70 100644
--- a/lecture_3.ipynb
+++ b/lecture_3.ipynb
@@ -6,7 +6,7 @@
    "source": [
     "## License \n",
     "\n",
-    "Copyright 2020 Patrick Hall (jphall@gwu.edu)\n",
+    "Copyright 2020 - 2023 Patrick Hall (jphall@gwu.edu)\n",
     "\n",
     "Licensed under the Apache License, Version 2.0 (the \"License\");\n",
     "you may not use this file except in compliance with the License.\n",
@@ -7794,7 +7794,7 @@
  "metadata": {
   "anaconda-cloud": {},
   "kernelspec": {
-   "display_name": "Python 3",
+   "display_name": "Python 3 (ipykernel)",
    "language": "python",
    "name": "python3"
   },
@@ -7808,7 +7808,7 @@
    "name": "python",
    "nbconvert_exporter": "python",
    "pygments_lexer": "ipython3",
-   "version": "3.6.9"
+   "version": "3.10.6"
   }
  },
  "nbformat": 4,
diff --git a/lecture_4.ipynb b/lecture_4.ipynb
index 9240b09..b9c7ec7 100644
--- a/lecture_4.ipynb
+++ b/lecture_4.ipynb
@@ -6,7 +6,7 @@
    "source": [
     "## License \n",
     "\n",
-    "Copyright 2020 Patrick Hall (jphall@gwu.edu)\n",
+    "Copyright 2020 - 2023 Patrick Hall (jphall@gwu.edu)\n",
     "\n",
     "Licensed under the Apache License, Version 2.0 (the \"License\");\n",
     "you may not use this file except in compliance with the License.\n",
@@ -1488,7 +1488,7 @@
  "metadata": {
   "anaconda-cloud": {},
   "kernelspec": {
-   "display_name": "Python 3",
+   "display_name": "Python 3 (ipykernel)",
    "language": "python",
    "name": "python3"
   },
@@ -1502,7 +1502,7 @@
    "name": "python",
    "nbconvert_exporter": "python",
    "pygments_lexer": "ipython3",
-   "version": "3.6.9"
+   "version": "3.10.6"
   }
  },
  "nbformat": 4,
diff --git a/lecture_5.ipynb b/lecture_5.ipynb
index 2c9a64b..703bb36 100644
--- a/lecture_5.ipynb
+++ b/lecture_5.ipynb
@@ -6,7 +6,7 @@
    "source": [
     "## License \n",
     "\n",
-    "Copyright 2020 Patrick Hall (jphall@gwu.edu)\n",
+    "Copyright 2020 - 2023 Patrick Hall (jphall@gwu.edu)\n",
     "\n",
     "Licensed under the Apache License, Version 2.0 (the \"License\");\n",
     "you may not use this file except in compliance with the License.\n",
@@ -2775,7 +2775,7 @@
  "metadata": {
   "anaconda-cloud": {},
   "kernelspec": {
-   "display_name": "Python 3",
+   "display_name": "Python 3 (ipykernel)",
    "language": "python",
    "name": "python3"
   },
@@ -2789,7 +2789,7 @@
    "name": "python",
    "nbconvert_exporter": "python",
    "pygments_lexer": "ipython3",
-   "version": "3.6.9"
+   "version": "3.10.6"
   }
  },
  "nbformat": 4,