diff --git a/README.md b/README.md
index 4e00bb6..474f7a2 100644
--- a/README.md
+++ b/README.md
@@ -586,8 +586,8 @@ Cuando estemos contentos con nuestro `zsh` tendremos que ejecutar
 Añadimos el ppa:
 
 ``` {bash}
-curl -s https://syncthing.net/release-key.txt | sudo apt-key add -
-echo "deb https://apt.syncthing.net/ syncthing stable" | sudo tee /etc/apt/sources.list.d/syncthing.list
+curl -s https://syncthing.net/release-key.txt | sudo gpg --dearmour -o /usr/local/share/keyrings/synching-archive-keyring.gpg
+echo "deb [ signed-by=/usr/local/share/keyrings/synching-archive-keyring.gpg ] https://apt.syncthing.net/ syncthing stable" | sudo tee /etc/apt/sources.list.d/syncthing.list
 sudo apt-get update
 sudo apt-get install syncthing
 ```
diff --git a/out/LinuxMintUlyana.dw b/out/LinuxMintUlyana.dw
index 97eace8..3feee5f 100644
--- a/out/LinuxMintUlyana.dw
+++ b/out/LinuxMintUlyana.dw
@@ -455,8 +455,8 @@ sudo apt-get install mint-meta-codecs
 Añadimos el ppa:
 
 <code {bash}>
-curl -s https://syncthing.net/release-key.txt | sudo apt-key add -
-echo "deb https://apt.syncthing.net/ syncthing stable" | sudo tee /etc/apt/sources.list.d/syncthing.list
+curl -s https://syncthing.net/release-key.txt | sudo gpg --dearmour -o /usr/local/share/keyrings/synching-archive-keyring.gpg
+echo "deb [ signed-by=/usr/local/share/keyrings/synching-archive-keyring.gpg ] https://apt.syncthing.net/ syncthing stable" | sudo tee /etc/apt/sources.list.d/syncthing.list
 sudo apt-get update
 sudo apt-get install syncthing
 </code>
diff --git a/out/LinuxMintUlyana.epub b/out/LinuxMintUlyana.epub
index aeab3dd..1bc220e 100644
Binary files a/out/LinuxMintUlyana.epub and b/out/LinuxMintUlyana.epub differ
diff --git a/out/LinuxMintUlyana.mw b/out/LinuxMintUlyana.mw
index f36420b..02d21b6 100644
--- a/out/LinuxMintUlyana.mw
+++ b/out/LinuxMintUlyana.mw
@@ -426,8 +426,8 @@ Cuando estemos contentos con nuestro <code>zsh</code> tendremos que ejecutar <co
 
 Añadimos el ppa:
 
-<pre class="{bash}">curl -s https://syncthing.net/release-key.txt | sudo apt-key add -
-echo &quot;deb https://apt.syncthing.net/ syncthing stable&quot; | sudo tee /etc/apt/sources.list.d/syncthing.list
+<pre class="{bash}">curl -s https://syncthing.net/release-key.txt | sudo gpg --dearmour -o /usr/local/share/keyrings/synching-archive-keyring.gpg
+echo &quot;deb [ signed-by=/usr/local/share/keyrings/synching-archive-keyring.gpg ] https://apt.syncthing.net/ syncthing stable&quot; | sudo tee /etc/apt/sources.list.d/syncthing.list
 sudo apt-get update
 sudo apt-get install syncthing</pre>
 <span id="utilidades"></span>
diff --git a/out/LinuxMintUlyana.odt b/out/LinuxMintUlyana.odt
index 6c5e5b3..4733d05 100644
Binary files a/out/LinuxMintUlyana.odt and b/out/LinuxMintUlyana.odt differ
diff --git a/out/LinuxMintUlyana.pdf b/out/LinuxMintUlyana.pdf
index 2065407..b332ada 100644
Binary files a/out/LinuxMintUlyana.pdf and b/out/LinuxMintUlyana.pdf differ
diff --git a/out/LinuxMintUlyana.tex b/out/LinuxMintUlyana.tex
index 17afb52..6103dff 100644
--- a/out/LinuxMintUlyana.tex
+++ b/out/LinuxMintUlyana.tex
@@ -884,8 +884,8 @@ Añadimos el ppa:
 
 \begin{Shaded}
 \begin{Highlighting}[]
-\NormalTok{curl {-}s https://syncthing.net/release{-}key.txt | sudo apt{-}key add {-}}
-\NormalTok{echo "deb https://apt.syncthing.net/ syncthing stable" | sudo tee /etc/apt/sources.list.d/syncthing.list}
+\NormalTok{curl {-}s https://syncthing.net/release{-}key.txt | sudo gpg {-}{-}dearmour {-}o /usr/local/share/keyrings/synching{-}archive{-}keyring.gpg}
+\NormalTok{echo "deb [ signed{-}by=/usr/local/share/keyrings/synching{-}archive{-}keyring.gpg ] https://apt.syncthing.net/ syncthing stable" | sudo tee /etc/apt/sources.list.d/syncthing.list}
 \NormalTok{sudo apt{-}get update}
 \NormalTok{sudo apt{-}get install syncthing}
 \end{Highlighting}
diff --git a/src/200_basics.md b/src/200_basics.md
index 485c1a3..a0e6c1d 100644
--- a/src/200_basics.md
+++ b/src/200_basics.md
@@ -549,8 +549,8 @@ sudo apt-get install mint-meta-codecs
 Añadimos el ppa:
 
 ~~~~{bash}
-curl -s https://syncthing.net/release-key.txt | sudo apt-key add -
-echo "deb https://apt.syncthing.net/ syncthing stable" | sudo tee /etc/apt/sources.list.d/syncthing.list
+curl -s https://syncthing.net/release-key.txt | sudo gpg --dearmour -o /usr/local/share/keyrings/synching-archive-keyring.gpg
+echo "deb [ signed-by=/usr/local/share/keyrings/synching-archive-keyring.gpg ] https://apt.syncthing.net/ syncthing stable" | sudo tee /etc/apt/sources.list.d/syncthing.list
 sudo apt-get update
 sudo apt-get install syncthing
 ~~~~