diff --git a/_includes/manuals/nightly/1.2_release_notes.md b/_includes/manuals/nightly/1.2_release_notes.md
index c042901c21..9bc3f33018 100644
--- a/_includes/manuals/nightly/1.2_release_notes.md
+++ b/_includes/manuals/nightly/1.2_release_notes.md
@@ -6,6 +6,17 @@ This section will be updated prior to the next release.
 
 ### Upgrade warnings
 
+#### Running Foreman on Debian 11 (Bullseye) is not supported anymore
+
+Foreman supports running on Debian 12 (Bullseye) since 3.11.4.
+Running Foreman on Debian 11 has been deprecated since 3.13.
+Support for running Foreman on Debian 11 has been removed.
+
+Note this is for running Foreman itself.
+Clients will remain supported.
+
+For more details, see the [removal RFC](https://community.theforeman.org/t/drop-debian-11-ruby-2-7-and-nodejs-14-support-in-foreman-3-14/40503).
+
 ### Deprecations
 
 ### Release Notes
diff --git a/_includes/manuals/nightly/2.1_quickstart_installation.md b/_includes/manuals/nightly/2.1_quickstart_installation.md
index bcd1d58028..5e0f2b2209 100644
--- a/_includes/manuals/nightly/2.1_quickstart_installation.md
+++ b/_includes/manuals/nightly/2.1_quickstart_installation.md
@@ -25,7 +25,6 @@ To provide specific installation instructions, please select your operating syst
 <select onChange="update_quickstart_os(this);">
   <option value="none">-- select operating system --</option>
   <option value="el9">Enterprise Linux 9</option>
-  <option value="debian11">Debian 11 (Bullseye)</option>
   <option value="debian12">Debian 12 (Bookworm)</option>
   <option value="ubuntu2204">Ubuntu 22.04 (Jammy)</option>
 </select>
@@ -54,26 +53,6 @@ sudo dnf -y install https://yum.theforeman.org/releases/{{page.version}}/el9/x86
 {% endhighlight %}
 </div>
 
-<div class="quickstart_os quickstart_os_debian11">
-  <p>
-    Enable Puppet's 8.x repository:
-  </p>
-
-{% highlight bash %}
-sudo apt-get -y install ca-certificates
-cd /tmp && wget https://apt.puppet.com/puppet8-release-bullseye.deb
-sudo apt-get install /tmp/puppet8-release-bullseye.deb
-{% endhighlight %}
-
-  <p>Enable the Foreman repositories:</p>
-
-{% highlight bash %}
-sudo wget https://deb.theforeman.org/foreman.asc -O /etc/apt/trusted.gpg.d/foreman.asc
-echo "deb http://deb.theforeman.org/ bullseye {{page.version}}" | sudo tee /etc/apt/sources.list.d/foreman.list
-echo "deb http://deb.theforeman.org/ plugins {{page.version}}" | sudo tee -a /etc/apt/sources.list.d/foreman.list
-{% endhighlight %}
-</div>
-
 <div class="quickstart_os quickstart_os_debian12">
   <p>
     Enable Puppet's 8.x repository:
diff --git a/_includes/manuals/nightly/3.3.2_debian_packages.md b/_includes/manuals/nightly/3.3.2_debian_packages.md
index 0fe8b40415..d99f182682 100644
--- a/_includes/manuals/nightly/3.3.2_debian_packages.md
+++ b/_includes/manuals/nightly/3.3.2_debian_packages.md
@@ -3,7 +3,6 @@ The Foreman packages should work on the following Debian-based Linux distributio
 
 #### Distributions
 
-* Debian Linux 11 (Bullseye), amd64
 * Debian Linux 12 (Bookworm), amd64
 * Ubuntu Linux 22.04 LTS (Jammy Jellyfish), amd64
 
@@ -14,8 +13,6 @@ If you encounter any errors during the installation, [please file a bug report!]
 Add one of the following lines to your */etc/apt/sources.list* (alternatively in a separate file in */etc/apt/sources.list.d/foreman.list*):
 
 ```
-# Debian Bullseye
-deb http://deb.theforeman.org/ bullseye {{page.version}}
 # Debian Bookworm
 deb http://deb.theforeman.org/ bookworm {{page.version}}
 # Ubuntu 22.04 Jammy
diff --git a/_includes/manuals/nightly/3.6_upgrade.md b/_includes/manuals/nightly/3.6_upgrade.md
index 748f84d29a..c9b85f0084 100644
--- a/_includes/manuals/nightly/3.6_upgrade.md
+++ b/_includes/manuals/nightly/3.6_upgrade.md
@@ -36,7 +36,6 @@ To provide specific installation instructions, please select your operating syst
 <select id="upgrade_os" onChange="update_upgrade_os(this);">
   <option value="none">-- select operating system --</option>
   <option value="el9">CentOS Stream 9 / Red Hat Enterprise Linux 9</option>
-  <option value="debian11">Debian 11 (Bullseye)</option>
   <option value="debian12">Debian 12 (Bookworm)</option>
   <option value="ubuntu2204">Ubuntu 22.04 (Jammy)</option>
 </select>
@@ -62,7 +61,7 @@ Before proceeding, it is necessary to shutdown the Foreman instance.
 systemctl stop httpd foreman.service foreman.socket dynflow\*
 {% endhighlight %}
 </div>
-<div class="upgrade_os upgrade_os_debian11 upgrade_os_debian12 upgrade_os_ubuntu2204">
+<div class="upgrade_os upgrade_os_debian12 upgrade_os_ubuntu2204">
 {% highlight bash %}
 systemctl stop apache2 foreman.service foreman.socket dynflow\*
 {% endhighlight %}
@@ -95,7 +94,7 @@ dnf upgrade ruby\* foreman\*
 {% endhighlight %}
 </div>
 
-<div class="upgrade_os upgrade_os_debian11 upgrade_os_debian12 upgrade_os_ubuntu2204">
+<div class="upgrade_os upgrade_os_debian12 upgrade_os_ubuntu2204">
 Upgrading from the last release to {{page.version}} has been tested. Updating
 the packages will upgrade the application and automatically migrate the
 database.
@@ -103,12 +102,6 @@ database.
 First edit `/etc/apt/sources.list.d/foreman.list` and change the release
 number from the previous release to `{{ page.version }}`:
 
-<div class="upgrade_os upgrade_os_debian11">
-{% highlight bash %}
-deb http://deb.theforeman.org/ bullseye {{ page.version }}
-deb http://deb.theforeman.org/ plugins {{ page.version }}
-{% endhighlight %}
-</div>
 <div class="upgrade_os upgrade_os_debian12">
 {% highlight bash %}
 deb http://deb.theforeman.org/ bookworm {{ page.version }}
@@ -180,7 +173,7 @@ Start the application server. This is redundant if you previously ran `foreman-i
 systemctl start httpd foreman.service foreman.socket
 {% endhighlight %}
 </div>
-<div class="upgrade_os upgrade_os_debian11 upgrade_os_debian12 upgrade_os_ubuntu2204">
+<div class="upgrade_os upgrade_os_debian12 upgrade_os_ubuntu2204">
 {% highlight bash %}
 systemctl start apache2 foreman.service foreman.socket
 {% endhighlight %}