diff --git a/CHANGELOG.md b/CHANGELOG.md
index cb079a61..24f04f16 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -2,6 +2,9 @@
 
 ## untagged
 
+- acmetool: accept new Let's Encrypt ToS: https://letsencrypt.org/documents/LE-SA-v1.6-August-18-2025.pdf
+  ([#729](https://github.com/chatmail/relay/pull/729))
+
 - Organized cmdeploy into install, configure, and activate stages
   ([#695](https://github.com/chatmail/relay/pull/695))
 
diff --git a/cmdeploy/src/cmdeploy/acmetool/response-file.yaml.j2 b/cmdeploy/src/cmdeploy/acmetool/response-file.yaml.j2
index 15014beb..1a6f6ca6 100644
--- a/cmdeploy/src/cmdeploy/acmetool/response-file.yaml.j2
+++ b/cmdeploy/src/cmdeploy/acmetool/response-file.yaml.j2
@@ -1,2 +1,2 @@
 "acme-enter-email": "{{ email }}"
-"acme-agreement:https://letsencrypt.org/documents/LE-SA-v1.5-February-24-2025.pdf": true
+"acme-agreement:https://letsencrypt.org/documents/LE-SA-v1.6-August-18-2025.pdf": true