diff --git a/external/os-guides/pentesting/kali.md b/external/os-guides/pentesting/kali.md
index 5cda6f74..09a7bda7 100644
--- a/external/os-guides/pentesting/kali.md
+++ b/external/os-guides/pentesting/kali.md
@@ -365,7 +365,11 @@ There are multiple ways to create a Kali Linux VM:
       
         [user@kali ~]$ sudo sed -i 's/stretch/buster/g' /etc/apt/sources.list
         [user@kali ~]$ sudo sed -i 's/stretch/buster/g' /etc/apt/sources.list.d/qubes-r<X>.list
+        
+For installation based on Debian 10 stable, please note that the security repository of Debian testing has [recently been renamed][Debian-security-naming-convention] from `<current testing>/update` to `<current-testing>-security`. To account for that change, execute the following command.
 
+        [user@kali ~]$ sudo sed -i 's/bullseye\/updates/bullseye-security/g' /etc/apt/sources.list
+        
 5. Upgrade `kali` template to latest Debian testing release
 
         [user@kali ~]$ sudo apt-get update
@@ -525,6 +529,10 @@ These instructions will show you how to upgrade a Debian TemplateVM to Kali Linu
       
         [user@kali-rolling ~]$ sudo sed -i 's/stretch/buster/g' /etc/apt/sources.list
         [user@kali-rolling ~]$ sudo sed -i 's/stretch/buster/g' /etc/apt/sources.list.d/qubes-r<X>.list
+        
+For installation based on Debian 10 stable, please note that the security repository of Debian testing has [recently been renamed][Debian-security-naming-convention] from `<current testing>/update` to `<current-testing>-security`. To account for that change, execute the following command.
+
+        [user@kali ~]$ sudo sed -i 's/bullseye\/updates/bullseye-security/g' /etc/apt/sources.list
 
 5. Upgrade `kali-rolling` template to latest Debian testing release
 
@@ -607,3 +615,5 @@ Thanks to the people in [the discussion thread](https://github.com/QubesOS/qubes
 
 [Debian-releases]: https://www.debian.org/releases/
 
+[Debian-security-naming-convention]: https://www.mail-archive.com/debian-security@lists.debian.org/msg41223.html
+