diff --git a/Dockerfile b/Dockerfile
index dc4b13a..269a98d 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 f5f82e7..3a1bd0a 100644
--- a/README.md
+++ b/README.md
@@ -186,8 +186,6 @@ services:
   krita:
     image: lscr.io/linuxserver/krita:latest
     container_name: krita
-    security_opt:
-      - seccomp:unconfined #optional
     environment:
       - PUID=1000
       - PGID=1000
@@ -197,6 +195,7 @@ services:
     ports:
       - 3000:3000
       - 3001:3001
+    shm_size: "1gb"
     restart: unless-stopped
 ```
 
@@ -205,13 +204,13 @@ services:
 ```bash
 docker run -d \
   --name=krita \
-  --security-opt seccomp=unconfined `#optional` \
   -e PUID=1000 \
   -e PGID=1000 \
   -e TZ=Etc/UTC \
   -p 3000:3000 \
   -p 3001:3001 \
   -v /path/to/config:/config \
+  --shm-size="1gb" \
   --restart unless-stopped \
   lscr.io/linuxserver/krita:latest
 ```
@@ -228,7 +227,7 @@ Containers are configured using parameters passed at runtime (such as those abov
 | `-e PGID=1000` | for GroupID - see below for explanation |
 | `-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 |
-| `--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. |
+| `--shm-size=` | Recommended for all desktop images. |
 
 ## Environment variables from files (Docker secrets)
 
@@ -392,6 +391,7 @@ Once registered you can define the dockerfile to use with `-f Dockerfile.aarch64
 
 ## Versions
 
+* **22.09.25:** - Rebase to Debian Trixie.
 * **12.07.25:** - Rebase to Selkies and Debian, use AppImage, HTTPS IS NOW REQUIRED. Remove arm64 support.
 * **06.12.24:** - Rebase to Alpine 3.21.
 * **23.05.24:** - Rebase to Alpine 3.20.
diff --git a/readme-vars.yml b/readme-vars.yml
index acd8fde..6309ad8 100644
--- a/readme-vars.yml
+++ b/readme-vars.yml
@@ -16,9 +16,6 @@ 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"}
@@ -26,9 +23,8 @@ param_usage_include_ports: true
 param_ports:
   - {external_port: "3000", internal_port: "3000", port_desc: "HTTP Krita desktop gui, must be proxied."}
   - {external_port: "3001", internal_port: "3001", port_desc: "Krita desktop gui HTTPS."}
-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."}
+custom_params:
+  - {name: "shm-size", name_compose: "shm_size", value: "1gb", desc: "Recommended for all desktop images."}
 # Selkies blurb settings
 selkies_blurb: true
 # application setup block
@@ -108,6 +104,7 @@ init_diagram: |
   "krita:latest" <- Base Images
 # changelog
 changelogs:
+  - {date: "22.09.25:", desc: "Rebase to Debian Trixie."}
   - {date: "12.07.25:", desc: "Rebase to Selkies and Debian, use AppImage, HTTPS IS NOW REQUIRED. Remove arm64 support."}
   - {date: "06.12.24:", desc: "Rebase to Alpine 3.21."}
   - {date: "23.05.24:", desc: "Rebase to Alpine 3.20."}