diff --git a/Lecture4.ipynb b/Lecture4.ipynb
index f3cb633..7d553b3 100644
--- a/Lecture4.ipynb
+++ b/Lecture4.ipynb
@@ -118,7 +118,8 @@
    "source": [
     "<details>\n",
     "<summary>Colab error solution</summary>\n",
-    "If running the import module cell fails with an \"AttributeError\", click `Runtime` -> `Restart Session` and then simply rerun the cell. "
+    "If running the import module cell fails with an \"AttributeError\", click `Runtime` -> `Restart Session` and then simply rerun the cell. \n",
+    "</details>"
    ]
   },
   {
@@ -997,7 +998,7 @@
    "name": "python",
    "nbconvert_exporter": "python",
    "pygments_lexer": "ipython3",
-   "version": "3.9.18"
+   "version": "3.10.13"
   },
   "vscode": {
    "interpreter": {
diff --git a/Lecture5.ipynb b/Lecture5.ipynb
index abadce3..f001071 100644
--- a/Lecture5.ipynb
+++ b/Lecture5.ipynb
@@ -104,15 +104,14 @@
    "source": [
     "<details>\n",
     "<summary>Colab error solution</summary>\n",
-    "If running the import module cell fails with an \"AttributeError\", click `Runtime` -> `Restart Session` and then simply rerun the cell."
+    "If running the import module cell fails with an \"AttributeError\", click `Runtime` -> `Restart Session` and then simply rerun the cell.\n",
+    "</details>"
    ]
   },
   {
    "cell_type": "markdown",
    "metadata": {},
    "source": [
-    "### Model building\n",
-    "\n",
     "Pay attention to each step in the process:"
    ]
   },