diff --git a/docker/Dockerfile b/docker/Dockerfile
index b292ca6..ef0a188 100644
--- a/docker/Dockerfile
+++ b/docker/Dockerfile
@@ -1,22 +1,13 @@
-# With big thanks to @Silex and @purcell, this Dockerfile is based on:
-# <https://github.com/Silex/docker-emacs/blob/master/29.1/debian/Dockerfile>
-
-FROM nixos/nix:2.19.1 AS nixos
-
-ADD https://api.github.com/repos/purcell/nix-emacs-ci/git/refs/heads/master /tmp/cache
-RUN nix-env -iA cachix -f https://cachix.org/api/v1/install \
-    && cachix use emacs-ci \
-    && nix-env -iA emacs-29-1 -f https://github.com/purcell/nix-emacs-ci/archive/master.tar.gz \
-    && nix --extra-experimental-features nix-command copy --no-require-sigs --to /nix-emacs "$(command -v emacs)" \
-    && ln --relative --symbolic /nix-emacs/nix/store/*emacs* /nix-emacs/nix/store/emacs
-
-FROM debian:trixie-20231120-slim
-
-COPY --from=nixos /nix-emacs/nix/store /nix/store
-ENV PATH="/nix/store/emacs/bin:$PATH"
+# Based on:
+# <https://ubuntuhandbook.org/index.php/2023/08/gnu-emacs-29-1-ubuntu-ppa/>
+FROM ubuntu:22.04
 
 RUN apt-get update \
         && apt-get -y install curl gnupg openssh-client wget \
+        && apt-get -y --no-install-recommends install software-properties-common \
+        && add-apt-repository ppa:ubuntuhandbook1/emacs \
+        && apt-get -y install emacs emacs-common \
+        && apt-get -y purge software-properties-common \
         && apt-get -y autoremove \
         && rm -rf /var/lib/apt/lists/* /root/.cache/*