diff --git a/README.d/01-download-certs.avif b/README.d/01-download-certs.avif
index f2afeb54..e4d8755c 100644
Binary files a/README.d/01-download-certs.avif and b/README.d/01-download-certs.avif differ
diff --git a/README.d/03-check-certs.avif b/README.d/03-check-certs.avif
index 1f03ad2c..6610ac47 100644
Binary files a/README.d/03-check-certs.avif and b/README.d/03-check-certs.avif differ
diff --git a/README.md b/README.md
index f9149217..6f7c03c8 100644
--- a/README.md
+++ b/README.md
@@ -112,7 +112,7 @@ If you intend to download the scripts from a
 different location (for example from github.com) install the corresponding
 certificate chain.
 
-    /tool/fetch "https://rsc.eworm.de/main/certs/ISRG-Root-X2.pem" dst-path="isrg-root-x2.pem";
+    /tool/fetch "https://rsc.eworm.de/main/certs/Root-YE.pem" dst-path="root-ye.pem";
 
 ![screenshot: download certs](README.d/01-download-certs.avif)
 
@@ -120,11 +120,11 @@ Note that the commands above do *not* verify server certificate, so if you
 want to be safe download with your workstations's browser and transfer the
 file to your MikroTik device.
 
-* [ISRG Root X2 ↗️](https://letsencrypt.org/certs/isrg-root-x2.pem)
+* Let's Encrypt [Root YE ↗️](https://letsencrypt.org/certs/gen-y/root-ye.pem)
 
 Then we import the certificate.
 
-    /certificate/import file-name="isrg-root-x2.pem" passphrase="";
+    /certificate/import file-name="root-ye.pem" passphrase="";
 
 Do not worry that the command is not shown - that happens because it contains
 a sensitive property, the passphrase.
@@ -132,11 +132,11 @@ a sensitive property, the passphrase.
 ![screenshot: import certs](README.d/02-import-certs.avif)
 
 For basic verification we rename the certificate and print it by
-fingerprint. Make sure exactly this one certificate ("*ISRG-Root-X2*")
+fingerprint. Make sure exactly this one certificate ("*Root-YE*")
 is shown.
 
-    /certificate/set name="ISRG-Root-X2" [ find where common-name="ISRG Root X2" ];
-    /certificate/print proplist=name,fingerprint where fingerprint="69729b8e15a86efc177a57afb7171dfc64add28c2fca8cf1507e34453ccb1470";
+    /certificate/set name="Root-YE" [ find where common-name="Root YE" ];
+    /certificate/print proplist=name,fingerprint where fingerprint="e14ffcad5b0025731006caa43a121a22d8e9700f4fb9cf852f02a708aa5d5666";
 
 ![screenshot: check certs](README.d/03-check-certs.avif)