diff --git a/docs/dist/debuggingbook-1.2.1.tar.gz b/docs/dist/debuggingbook-1.2.1.tar.gz
index 77a7b655..84047df8 100644
Binary files a/docs/dist/debuggingbook-1.2.1.tar.gz and b/docs/dist/debuggingbook-1.2.1.tar.gz differ
diff --git a/docs/dist/debuggingbook-code.zip b/docs/dist/debuggingbook-code.zip
index d604a637..1ee792b0 100644
Binary files a/docs/dist/debuggingbook-code.zip and b/docs/dist/debuggingbook-code.zip differ
diff --git a/docs/dist/debuggingbook-notebooks.zip b/docs/dist/debuggingbook-notebooks.zip
index ba2fcb6d..693fdd04 100644
Binary files a/docs/dist/debuggingbook-notebooks.zip and b/docs/dist/debuggingbook-notebooks.zip differ
diff --git a/docs/html/ReleaseNotes.html b/docs/html/ReleaseNotes.html
index 72694578..9ca1006f 100644
--- a/docs/html/ReleaseNotes.html
+++ b/docs/html/ReleaseNotes.html
@@ -11920,6 +11920,7 @@
      </li>
      <li class="has-sub"><a href="#"><span title="Release Notes for The Debugging Book"><i class="fa fa-fw fa-list-ul"></i></span> <span class="menu_2">Release Notes for The Debugging Book</span></a>
            <ul><li class="has-sub"><a href="#Current-Version-(in-progress)">&nbsp;&bull;&nbsp;&nbsp; Current Version (in progress)</a>
+</li><li class="has-sub"><a href="#Version-1.2.1-(2023-10-24)">&nbsp;&bull;&nbsp;&nbsp; Version 1.2.1 (2023-10-24)</a>
 </li><li class="has-sub"><a href="#Version-1.2-(2023-10-24)">&nbsp;&bull;&nbsp;&nbsp; Version 1.2 (2023-10-24)</a>
 </li><li class="has-sub"><a href="#Version-1.1.2-(2023-01-03)">&nbsp;&bull;&nbsp;&nbsp; Version 1.1.2 (2023-01-03)</a>
 </li><li class="has-sub"><a href="#Version-1.1.1-(2023-01-02)">&nbsp;&bull;&nbsp;&nbsp; Version 1.1.1 (2023-01-02)</a>
@@ -11992,6 +11993,15 @@
 </div>
 </div>
 
+<div class="input_markdown">
+<div class="cell border-box-sizing text_cell rendered">
+<div class="inner_cell">
+<div class="text_cell_render border-box-sizing rendered_html"><h2 id="Version-1.2.1-(2023-10-24)">Version 1.2.1 (2023-10-24)<a class="anchor-link" href="#Version-1.2.1-(2023-10-24)">&#182;</a></h2><p>This version fixes a typo in the <code>setup.py</code> requirements.</p>
+</div>
+</div>
+</div>
+</div>
+
 <div class="input_markdown">
 <div class="cell border-box-sizing text_cell rendered">
 <div class="inner_cell">
@@ -12087,7 +12097,7 @@
 The content of this project is licensed under the
 <a href="https://creativecommons.org/licenses/by-nc-sa/4.0/" target=_blank>Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International License</a>.
 The source code that is part of the content, as well as the source code used to format and display that content is licensed under the <a href="https://github.com/uds-se/debuggingbook/blob/master/LICENSE.md#mit-license">MIT License</a>.
-<a href="https://github.com/uds-se/debuggingbook/commits/master/notebooks/ReleaseNotes.ipynb" target=_blank)>Last change: 2023-10-24 14:11:55+02:00</a> &bull; 
+<a href="https://github.com/uds-se/debuggingbook/commits/master/notebooks/ReleaseNotes.ipynb" target=_blank)>Last change: 2023-10-24 18:18:26+02:00</a> &bull; 
 <a href="#citation" id="cite" onclick="revealCitation()">Cite</a> &bull;
 <a href="https://cispa.de/en/impressum" target=_blank>Imprint</a>
 </p>
@@ -12103,7 +12113,7 @@
 <a name="citation"></a>
 <h2>How to Cite this Work</h2>
 <p>
-Andreas Zeller: "<a href="https://www.debuggingbook.org/html/ReleaseNotes.html">Release Notes for The Debugging Book</a>".  In Andreas Zeller, "<a href="https://www.debuggingbook.org/">The Debugging Book</a>", <a href="https://www.debuggingbook.org/html/ReleaseNotes.html">https://www.debuggingbook.org/html/ReleaseNotes.html</a>.  Retrieved 2023-10-24 14:11:55+02:00.
+Andreas Zeller: "<a href="https://www.debuggingbook.org/html/ReleaseNotes.html">Release Notes for The Debugging Book</a>".  In Andreas Zeller, "<a href="https://www.debuggingbook.org/">The Debugging Book</a>", <a href="https://www.debuggingbook.org/html/ReleaseNotes.html">https://www.debuggingbook.org/html/ReleaseNotes.html</a>.  Retrieved 2023-10-24 18:18:26+02:00.
 </p>
 <pre>
 @incollection{debuggingbook2023:ReleaseNotes,
@@ -12113,9 +12123,9 @@ <h2>How to Cite this Work</h2>
     year = {2023},
     publisher = {CISPA Helmholtz Center for Information Security},
     howpublished = {\url{https://www.debuggingbook.org/html/ReleaseNotes.html}},
-    note = {Retrieved 2023-10-24 14:11:55+02:00},
+    note = {Retrieved 2023-10-24 18:18:26+02:00},
     url = {https://www.debuggingbook.org/html/ReleaseNotes.html},
-    urldate = {2023-10-24 14:11:55+02:00}
+    urldate = {2023-10-24 18:18:26+02:00}
 }
 </pre>
 </div>
diff --git a/docs/notebooks/ReleaseNotes.ipynb b/docs/notebooks/ReleaseNotes.ipynb
index 2683dc3b..8a4ef2ce 100644
--- a/docs/notebooks/ReleaseNotes.ipynb
+++ b/docs/notebooks/ReleaseNotes.ipynb
@@ -33,6 +33,19 @@
     "Major changes will show up here as we make them."
    ]
   },
+  {
+   "cell_type": "markdown",
+   "metadata": {
+    "slideshow": {
+     "slide_type": "slide"
+    }
+   },
+   "source": [
+    "## Version 1.2.1 (2023-10-24)\n",
+    "\n",
+    "This version fixes a typo in the `setup.py` requirements."
+   ]
+  },
   {
    "cell_type": "markdown",
    "metadata": {