diff --git a/Dockerfile b/Dockerfile
index 9236950..b81b168 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,4 +1,6 @@
-FROM ghcr.io/linuxserver/baseimage-selkies:debianbookworm
+# syntax=docker/dockerfile:1
+
+FROM ghcr.io/linuxserver/baseimage-selkies:debiantrixie
 
 # set version label
 ARG BUILD_DATE
diff --git a/README.md b/README.md
index 3ac51e8..24df9e3 100644
--- a/README.md
+++ b/README.md
@@ -220,8 +220,6 @@ services:
   flycast:
     image: lscr.io/linuxserver/flycast:latest
     container_name: flycast
-    security_opt:
-      - seccomp:unconfined #optional
     environment:
       - PUID=1000
       - PGID=1000
@@ -240,7 +238,6 @@ services:
 ```bash
 docker run -d \
   --name=flycast \
-  --security-opt seccomp=unconfined `#optional` \
   -e PUID=1000 \
   -e PGID=1000 \
   -e TZ=Etc/UTC \
@@ -265,7 +262,6 @@ Containers are configured using parameters passed at runtime (such as those abov
 | `-e TZ=Etc/UTC` | specify a timezone to use, see this [list](https://en.wikipedia.org/wiki/List_of_tz_database_time_zones#List). |
 | `-v /config` | Users home directory in the container, stores local files and settings |
 | `--shm-size=` | This is needed for Flycast to function. |
-| `--security-opt seccomp=unconfined` | For Docker Engine only, many modern gui apps need this to function on older hosts as syscalls are unknown to Docker. |
 
 ## Environment variables from files (Docker secrets)
 
@@ -429,4 +425,5 @@ Once registered you can define the dockerfile to use with `-f Dockerfile.aarch64
 
 ## Versions
 
+* **22.09.25:** - Rebase to Debian Trixie.
 * **19.06.25:** - Initial release.
diff --git a/readme-vars.yml b/readme-vars.yml
index b2c561e..8e836ba 100644
--- a/readme-vars.yml
+++ b/readme-vars.yml
@@ -17,9 +17,6 @@ development_versions: false
 # container parameters
 common_param_env_vars_enabled: true
 param_container_name: "{{ project_name }}"
-param_usage_include_env: true
-param_env_vars:
-  - {env_var: "TZ", env_value: "Europe/London", desc: "Specify a timezone to use EG Europe/London."}
 param_usage_include_vols: true
 param_volumes:
   - {vol_path: "/config", vol_host_path: "/path/to/config", desc: "Users home directory in the container, stores local files and settings"}
@@ -29,10 +26,6 @@ param_ports:
   - {external_port: "3001", internal_port: "3001", port_desc: "HTTPS Flycast desktop gui."}
 custom_params:
   - {name: "shm-size", name_compose: "shm_size", value: "1gb", desc: "This is needed for Flycast to function."}
-# optional variables
-opt_security_opt_param: true
-opt_security_opt_param_vars:
-  - {run_var: "seccomp=unconfined", compose_var: "seccomp:unconfined", desc: "For Docker Engine only, many modern gui apps need this to function on older hosts as syscalls are unknown to Docker."}
 # Selkies blurb settings
 selkies_blurb: true
 show_nvidia: true
@@ -112,4 +105,5 @@ init_diagram: |
   "flycast:latest" <- Base Images
 # changelog
 changelogs:
+  - {date: "22.09.25:", desc: "Rebase to Debian Trixie."}
   - {date: "19.06.25:", desc: "Initial release."}