diff --git a/README.md b/README.md
index 0c5695f..3469fa1 100644
--- a/README.md
+++ b/README.md
@@ -9,12 +9,14 @@ available:
 - `coreutils`
 - `uv`
 - `just`
+- `tar`
+- `zstd`
+- `tzdata`
 
-These are the dependencies I install most commonly in workflows -- so it made
-sense for me to create an image containing them. I use it to make creating new
-Forgejo actions simpler. On my instance [git.ficd.sh](https://git.ficd.sh),
-where I've configured an additional label in the runner, I only need to add the
-following:
+These are sane dependencies for CI workflows -- so it made sense for me to
+create an image containing them. I use it to make creating new Forgejo actions
+simpler. On my instance [git.ficd.sh](https://git.ficd.sh), where I've
+configured an additional label in the runner, I only need to add the following:
 
 ```yaml
 runs-on: based-alpine
diff --git a/latest/Dockerfile b/latest/Dockerfile
index ba56855..532d577 100644
--- a/latest/Dockerfile
+++ b/latest/Dockerfile
@@ -1,7 +1,7 @@
 FROM node:alpine3.22
 
 # Install extras
-RUN apk add --no-cache bash curl git coreutils uv just tar zstd
+RUN apk add --no-cache bash curl git coreutils uv just tar zstd tzdata
 
 # ensure UV on path
 ENV PATH="/root/.local/bin:$PATH"