diff --git a/ct/gotenberg.sh b/ct/gotenberg.sh
index c226f0f45..f35034b84 100644
--- a/ct/gotenberg.sh
+++ b/ct/gotenberg.sh
@@ -54,12 +54,14 @@ function update_script() {
 
     msg_info "Migrating to Gotenberg 9"
     CODENAME=$(get_os_info codename)
-    setup_deb822_repo \
-      "debian-backports" \
-      "file:///usr/share/keyrings/debian-archive-keyring.gpg" \
-      "http://deb.debian.org/debian" \
-      "${CODENAME}-backports" \
-      "main"
+    cat <<EOF >/etc/apt/sources.list.d/debian-backports.sources
+Types: deb
+URIs: http://deb.debian.org/debian
+Suites: ${CODENAME}-backports
+Components: main
+Signed-By: /usr/share/keyrings/debian-archive-keyring.gpg
+EOF
+    apt_update_safe
     $STD apt install -y fonts-urw-base35
     $STD apt install -y -t "${CODENAME}-backports" \
       libreoffice-writer libreoffice-calc libreoffice-impress libreoffice-draw libreoffice-math
diff --git a/install/gotenberg-install.sh b/install/gotenberg-install.sh
index 6f6790ec7..fac829f45 100644
--- a/install/gotenberg-install.sh
+++ b/install/gotenberg-install.sh
@@ -15,12 +15,14 @@ update_os
 
 msg_info "Installing Dependencies"
 CODENAME=$(get_os_info codename)
-setup_deb822_repo \
-  "debian-backports" \
-  "file:///usr/share/keyrings/debian-archive-keyring.gpg" \
-  "http://deb.debian.org/debian" \
-  "${CODENAME}-backports" \
-  "main"
+cat <<EOF >/etc/apt/sources.list.d/debian-backports.sources
+Types: deb
+URIs: http://deb.debian.org/debian
+Suites: ${CODENAME}-backports
+Components: main
+Signed-By: /usr/share/keyrings/debian-archive-keyring.gpg
+EOF
+apt_update_safe
 $STD apt install -y \
   chromium \
   fonts-crosextra-carlito \