diff --git a/notebooks/16-non-linear-lsq-arrhenius-data-fit.ipynb b/notebooks/16-non-linear-lsq-arrhenius-data-fit.ipynb
index 97e6e9e..511b884 100644
--- a/notebooks/16-non-linear-lsq-arrhenius-data-fit.ipynb
+++ b/notebooks/16-non-linear-lsq-arrhenius-data-fit.ipynb
@@ -66,7 +66,7 @@
    "metadata": {},
    "source": [
     "## [Introduction](#toc)<a id=\"intro\"></a>\n",
-    "The non-linear least-squares method is an extension of the linear least-squares method, covered earlier in this course, to treat non-linear objective functions. Therefore Newton's method, also covered earlier, will be needed to solve an iterative version of the normal equations similarly obtained in the linear case. The theoretical notes we will need for this topic can be found in the course notes OneNote [ChEn-3170-nllsq](https://studentuml-my.sharepoint.com/:o:/g/personal/valmor_dealmeida_uml_edu/EneHAIon7YZFuB9JjA9m3pMBw6YL7qqvra6Zsv0QbaE6tw?e=lWvGX6). "
+    "The non-linear least-squares method is an extension of the linear least-squares method, covered earlier in this course, to treat non-linear objective functions. Therefore Newton's method, also covered earlier, will be needed to solve an iterative version of the normal equations similarly obtained in the linear case. The theoretical notes we will need for this topic can be found in the course notes OneNote [ChEn-3170-nllsq](https://studentuml-my.sharepoint.com/:o:/g/personal/valmor_dealmeida_uml_edu/EneHAIon7YZFuB9JjA9m3pMBw6YL7qqvra6Zsv0QbaE6tw?e=VGIngd). "
    ]
   },
   {
diff --git a/notebooks/17-chen-ode-introduction.ipynb b/notebooks/17-chen-ode-introduction.ipynb
index c0770b3..75d2e50 100644
--- a/notebooks/17-chen-ode-introduction.ipynb
+++ b/notebooks/17-chen-ode-introduction.ipynb
@@ -59,7 +59,7 @@
    "source": [
     "## Introduction<a id=\"intro\"></a>\n",
     "\n",
-    "At the moment, the elements of theory needed are in the course notes (OneNote [ChEn-3170-chen-odes](https://studentuml-my.sharepoint.com/:o:/g/personal/valmor_dealmeida_uml_edu/EmgguVANK9pOp0MR58EOoJgBYN2Rz2g1PoSbdakus5RNRA?e=TH3plT))."
+    "At the moment, the elements of theory needed are in the course notes (OneNote [ChEn-3170-chen-odes](https://studentuml-my.sharepoint.com/:o:/g/personal/valmor_dealmeida_uml_edu/EmgguVANK9pOp0MR58EOoJgBYN2Rz2g1PoSbdakus5RNRA?e=gWi1EQ))."
    ]
   },
   {
diff --git a/notebooks/19-cstr-cooling-coil.ipynb b/notebooks/19-cstr-cooling-coil.ipynb
index ff7d77f..3a13ae0 100644
--- a/notebooks/19-cstr-cooling-coil.ipynb
+++ b/notebooks/19-cstr-cooling-coil.ipynb
@@ -713,7 +713,7 @@
    "name": "python",
    "nbconvert_exporter": "python",
    "pygments_lexer": "ipython3",
-   "version": "3.7.1"
+   "version": "3.8.5"
   },
   "latex_envs": {
    "LaTeX_envs_menu_present": true,
diff --git a/notebooks/20-semi-batch-hx-coil.ipynb b/notebooks/20-semi-batch-hx-coil.ipynb
index bf76ef2..8805e9c 100644
--- a/notebooks/20-semi-batch-hx-coil.ipynb
+++ b/notebooks/20-semi-batch-hx-coil.ipynb
@@ -771,7 +771,7 @@
    "name": "python",
    "nbconvert_exporter": "python",
    "pygments_lexer": "ipython3",
-   "version": "3.7.1"
+   "version": "3.8.5"
   },
   "latex_envs": {
    "LaTeX_envs_menu_present": true,
diff --git a/notebooks/21-nuclear-point-reactor.ipynb b/notebooks/21-nuclear-point-reactor.ipynb
index 30cc5c4..83d4cb7 100644
--- a/notebooks/21-nuclear-point-reactor.ipynb
+++ b/notebooks/21-nuclear-point-reactor.ipynb
@@ -656,7 +656,7 @@
    "name": "python",
    "nbconvert_exporter": "python",
    "pygments_lexer": "ipython3",
-   "version": "3.7.1"
+   "version": "3.8.5"
   },
   "latex_envs": {
    "LaTeX_envs_menu_present": true,