diff --git a/UPGRADE.md b/UPGRADE.md
index 0b3449af..7029bb37 100644
--- a/UPGRADE.md
+++ b/UPGRADE.md
@@ -3,7 +3,7 @@
 # Table of Contents
 
 * [Upgrading Docker containers](#upgrading-docker-containers)
-* [Upgrading Raspberry Pi or Debian 12 Installation](#upgrading-raspberry-pi-or-debian-12-installation)
+* [Upgrading Raspberry Pi or Debian Installation](#upgrading-raspberry-pi-or-debian-installation)
 * [Upgrading a WROLPi Portable USB](#upgrading-a-wrolpi-portable-usb)
 
 ## Upgrading Docker containers
@@ -24,7 +24,9 @@
 7. Start all docker containers
     * `docker-compose up -d`
 
-## Upgrading Raspberry Pi or Debian 12 Installation
+## Upgrading Raspberry Pi or Debian Installation
+
+A Debian 12 (bookworm) WROLPi stays on the final version for Debian 12; reinstall on Debian 13 to get newer versions.
 
 1. Run the upgrade script
     * `sudo /bin/bash /opt/wrolpi/upgrade.sh`
diff --git a/help.sh b/help.sh
index 614ffcdf..60693606 100755
--- a/help.sh
+++ b/help.sh
@@ -43,10 +43,13 @@ rpi=false
 rpi4=false
 rpi5=false
 debian12=false
+debian13=false
 grep -q 'Raspberry Pi' /proc/cpuinfo >/dev/null && rpi=true
 grep -q 'Raspberry Pi 4' /proc/cpuinfo >/dev/null && rpi4=true
 grep -q 'Raspberry Pi 5' /proc/cpuinfo >/dev/null && rpi5=true
 grep -q 'PRETTY_NAME="Debian GNU/Linux 12 (bookworm)"' /etc/os-release >/dev/null && debian12=true
+os_version=$(awk -F= '$1=="VERSION_ID"{gsub(/"/,"",$2);print $2}' /etc/os-release 2>/dev/null)
+[[ ${os_version} =~ ^[0-9]+$ && ${os_version} -ge 13 ]] && debian13=true
 
 if [[ ${rpi4} == true ]]; then
   echo 'OK: Running on Raspberry Pi 4'
@@ -54,8 +57,10 @@ elif [[ ${rpi5} == true ]]; then
   echo 'OK: Running on Raspberry Pi 5'
 elif [[ ${rpi} == true ]]; then
   echo 'OK: Running on unknown Raspberry Pi'
+elif [[ ${debian13} == true ]]; then
+  echo "OK: Running on Debian ${os_version}"
 elif [[ ${debian12} == true ]]; then
-  echo 'OK: Running on Debian 12'
+  echo 'FAILED: Debian 12 is not supported by new versions of WROLPi.  Reinstall on Debian 13.'
 else
   echo "FAILED: Running on unknown operating system"
 fi
diff --git a/install.sh b/install.sh
index a12510a8..384e16f8 100755
--- a/install.sh
+++ b/install.sh
@@ -31,16 +31,23 @@ while getopts ":hb:" option; do
 done
 
 rpi=false
-debian12=false
 if (grep 'Raspberry Pi' /proc/cpuinfo >/dev/null); then
   rpi=true
 fi
-if (grep 'PRETTY_NAME="Debian GNU/Linux 12 (bookworm)"' /etc/os-release >/dev/null); then
-  debian12=true
-fi
 
-if [[ ${rpi} == false && ${debian12} == false ]]; then
-  echo 'This script can only be run on a Raspberry Pi or Debian 12!' && exit 2
+# Raspberry Pi OS and Debian both report the Debian release in VERSION_ID.  WROLPi requires Debian 13 (trixie) or
+# newer; Debian 12 installs stay on their final version and cannot be upgraded in place.
+os_id=""
+os_version=""
+if [ -r /etc/os-release ]; then
+  os_id=$(awk -F= '$1=="ID"{gsub(/"/,"",$2);print $2}' /etc/os-release)
+  os_version=$(awk -F= '$1=="VERSION_ID"{gsub(/"/,"",$2);print $2}' /etc/os-release)
+fi
+case "${os_version}" in
+  '' | *[!0-9]*) os_version=0 ;;
+esac
+if [[ ${os_id} != "debian" || ${os_version} -lt 13 ]]; then
+  echo 'This script can only be run on Debian 13 (trixie) or newer, or Raspberry Pi OS based on it!' && exit 2
 fi
 
 set -x
@@ -63,8 +70,8 @@ git clone https://github.com/lrnselfreliance/wrolpi.git /opt/wrolpi || :
 if [ ${rpi} == true ]; then
   /opt/wrolpi/scripts/install_raspberrypios.sh 2>&1 | tee /opt/wrolpi/install.log
   install_code=${PIPESTATUS[0]}
-elif [ ${debian12} == true ]; then
-  /opt/wrolpi/scripts/install_debian_12.sh 2>&1 | tee /opt/wrolpi/install.log
+else
+  /opt/wrolpi/scripts/install_debian.sh 2>&1 | tee /opt/wrolpi/install.log
   install_code=${PIPESTATUS[0]}
 fi
 
diff --git a/scripts/install_debian_12.sh b/scripts/install_debian.sh
similarity index 89%
rename from scripts/install_debian_12.sh
rename to scripts/install_debian.sh
index 23d43379..87bd7a58 100755
--- a/scripts/install_debian_12.sh
+++ b/scripts/install_debian.sh
@@ -1,5 +1,5 @@
 #!/usr/bin/env bash
-echo "Debian 12 install start: $(date '+%Y-%m-%d %H:%M:%S')"
+echo "Debian install start: $(date '+%Y-%m-%d %H:%M:%S')"
 
 set -x
 set -e
@@ -81,16 +81,8 @@ echo "
 
 WROLPi has successfully been installed!
 
-Mount your external hard drive to /media/wrolpi if you have one.  Change the
-file permissions if necessary:
- # sudo chown -R wrolpi:wrolpi /media/wrolpi
-
-Start the WROLPi services using:
- # sudo systemctl start wrolpi.target
-
-then navigate to:  https://$(hostnmae).local
-
-Or, join to the Wifi hotspot:
+Browse to http://$(hostname).local to choose the drive for your library, or join
+the WiFi hotspot:
 SSID: WROLPi
 Password: wrolpi hotspot
 
diff --git a/scripts/install_raspberrypios.sh b/scripts/install_raspberrypios.sh
index 3e005676..6cdc972d 100755
--- a/scripts/install_raspberrypios.sh
+++ b/scripts/install_raspberrypios.sh
@@ -81,16 +81,8 @@ echo "
 
 WROLPi has successfully been installed!
 
-Mount your external hard drive to /media/wrolpi if you have one.  Change the
-file permissions if necessary:
- # sudo chown -R wrolpi:wrolpi /media/wrolpi
-
-Start the WROLPi services using:
- # sudo systemctl start wrolpi.target
-
-then navigate to:  https://$(hostname).local
-
-Or, join to the Wifi hotspot:
+Browse to http://$(hostname).local to choose the drive for your library, or join
+the WiFi hotspot:
 SSID: WROLPi
 Password: wrolpi hotspot