diff --git a/Dockerfile b/Dockerfile
index 3b31614..e73bcde 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,6 +1,6 @@
 # syntax=docker/dockerfile:1
 
-FROM ghcr.io/linuxserver/baseimage-alpine:3.20 as buildstage
+FROM ghcr.io/linuxserver/baseimage-alpine:3.21 as buildstage
 
 # set version label
 ARG BUILD_DATE
@@ -44,7 +44,7 @@ RUN \
   rm -rf \
     /tmp/*
 
-FROM ghcr.io/linuxserver/baseimage-alpine-nginx:3.20
+FROM ghcr.io/linuxserver/baseimage-alpine-nginx:3.21
 
 ARG BUILD_DATE
 ARG VERSION
diff --git a/Dockerfile.aarch64 b/Dockerfile.aarch64
index 25d4677..29db42b 100644
--- a/Dockerfile.aarch64
+++ b/Dockerfile.aarch64
@@ -1,6 +1,6 @@
 # syntax=docker/dockerfile:1
 
-FROM ghcr.io/linuxserver/baseimage-alpine:arm64v8-3.20 as buildstage
+FROM ghcr.io/linuxserver/baseimage-alpine:arm64v8-3.21 as buildstage
 
 # set version label
 ARG BUILD_DATE
@@ -44,7 +44,7 @@ RUN \
   rm -rf \
     /tmp/*
 
-FROM ghcr.io/linuxserver/baseimage-alpine-nginx:arm64v8-3.20
+FROM ghcr.io/linuxserver/baseimage-alpine-nginx:arm64v8-3.21
 
 ARG BUILD_DATE
 ARG VERSION
diff --git a/README.md b/README.md
index cea9a96..4326971 100644
--- a/README.md
+++ b/README.md
@@ -60,7 +60,7 @@ The architectures supported by this image are:
 
 You have to create a Spotify application through their [developer dashboard](https://developer.spotify.com/dashboard/applications) to get your Client ID and secret. Set the Redirect URI to match your APP_URL address with `/api/oauth/spotify/callback` included after the domain (i.e., `http://localhost/api/oauth/spotify/callback`).
 
-The application requires an external [mongodb database](https://hub.docker.com/_/mongo/), supported versions are 4.x, 5.x, and 6.x.
+The application requires an external [mongodb database](https://hub.docker.com/_/mongo/), supported versions are 5.x, 6.x, and 7.x.
 
 This ia an all-in-one container which includes both the server and client components. If you require these to be separate then please use the releases from the [your_spotify repo](https://github.com/Yooooomi/your_spotify).
 
@@ -292,6 +292,7 @@ Once registered you can define the dockerfile to use with `-f Dockerfile.aarch64
 
 ## Versions
 
+* **20.12.24:** - Rebase to Alpine 3.21.
 * **27.05.24:** - Existing users should update their nginx confs to avoid http2 deprecation warnings.
 * **24.05.24:** - Rebase to Alpine 3.20.
 * **02.03.24:** - Updates for changes in 1.8.0. Initial DB migration may take several minutes.
diff --git a/readme-vars.yml b/readme-vars.yml
index 68239be..b23e2af 100644
--- a/readme-vars.yml
+++ b/readme-vars.yml
@@ -11,8 +11,6 @@ project_lsio_github_repo_url: "https://github.com/linuxserver/docker-{{ project_
 available_architectures:
   - {arch: "{{ arch_x86_64 }}", tag: "amd64-latest"}
   - {arch: "{{ arch_arm64 }}", tag: "arm64v8-latest"}
-# development version
-development_versions: false
 # container parameters
 param_container_name: "{{ project_name }}"
 param_usage_include_ports: true
@@ -21,7 +19,6 @@ param_ports:
   - {external_port: "443", internal_port: "443", port_desc: "your_spotify HTTPS webui"}
 param_usage_include_env: true
 param_env_vars:
-  - {env_var: "TZ", env_value: "Europe/London", desc: "Specify a timezone to use EG Europe/London."}
   - {env_var: "APP_URL", env_value: "http://localhost", desc: "The protocol and hostname where the app will be accessed."}
   - {env_var: "SPOTIFY_PUBLIC", env_value: "", desc: "Your Spotify application client ID."}
   - {env_var: "SPOTIFY_SECRET", env_value: "", desc: "Your Spotify application secret."}
@@ -32,7 +29,7 @@ app_setup_block_enabled: true
 app_setup_block: |
   You have to create a Spotify application through their [developer dashboard](https://developer.spotify.com/dashboard/applications) to get your Client ID and secret. Set the Redirect URI to match your APP_URL address with `/api/oauth/spotify/callback` included after the domain (i.e., `http://localhost/api/oauth/spotify/callback`).
 
-  The application requires an external [mongodb database](https://hub.docker.com/_/mongo/), supported versions are 4.x, 5.x, and 6.x.
+  The application requires an external [mongodb database](https://hub.docker.com/_/mongo/), supported versions are 5.x, 6.x, and 7.x.
 
   This ia an all-in-one container which includes both the server and client components. If you require these to be separate then please use the releases from the [your_spotify repo](https://github.com/Yooooomi/your_spotify).
 # init diagram
@@ -94,6 +91,7 @@ init_diagram: |
   "your_spotify:latest" <- Base Images
 # changelog
 changelogs:
+  - {date: "20.12.24:", desc: "Rebase to Alpine 3.21."}
   - {date: "27.05.24:", desc: "Existing users should update their nginx confs to avoid http2 deprecation warnings."}
   - {date: "24.05.24:", desc: "Rebase to Alpine 3.20."}
   - {date: "02.03.24:", desc: "Updates for changes in 1.8.0. Initial DB migration may take several minutes."}