diff --git a/docs/configuring-playbook-bridge-mx-puppet-slack.md b/docs/configuring-playbook-bridge-mx-puppet-slack.md
index 0630270f..8db159d7 100644
--- a/docs/configuring-playbook-bridge-mx-puppet-slack.md
+++ b/docs/configuring-playbook-bridge-mx-puppet-slack.md
@@ -4,8 +4,8 @@
 [matrix-appservice-slack](configuring-playbook-bridge-appservice-slack.md)
 bridge supported by the playbook.
 
-The playbook can install and configure
-[mx-puppet-slack](https://github.com/Sorunome/mx-puppet-slack) for you.
+The playbook can install and configure [Beeper](https://www.beeper.com/)-maintained fork of
+[mx-puppet-slack](https://gitlab.com/beeper/mx-puppet-monorepo) for you.
 
 See the project page to learn what it does and why it might be useful to you.
 
diff --git a/roles/matrix-bridge-mx-puppet-slack/defaults/main.yml b/roles/matrix-bridge-mx-puppet-slack/defaults/main.yml
index bf5c6dfa..bb92c1d8 100644
--- a/roles/matrix-bridge-mx-puppet-slack/defaults/main.yml
+++ b/roles/matrix-bridge-mx-puppet-slack/defaults/main.yml
@@ -1,6 +1,6 @@
 ---
 # Mx Puppet Slack is a Matrix <-> Slack bridge
-# See: https://github.com/Sorunome/mx-puppet-slack
+# See: https://gitlab.com/beeper/mx-puppet-monorepo (originally based on https://github.com/Sorunome/mx-puppet-slack)
 
 matrix_mx_puppet_slack_enabled: true
 
@@ -8,7 +8,9 @@ matrix_mx_puppet_slack_oauth_client_id: ''
 matrix_mx_puppet_slack_oauth_client_secret: ''
 
 matrix_mx_puppet_slack_container_image_self_build: false
-matrix_mx_puppet_slack_container_image_self_build_repo: "https://github.com/Sorunome/mx-puppet-slack.git"
+matrix_mx_puppet_slack_container_image_self_build_repo: "https://gitlab.com/beeper/mx-puppet-monorepo.git"
+matrix_mx_puppet_slack_container_image_self_build_version: "{{ 'main' if matrix_mx_puppet_slack_version == 'latest' else matrix_mx_puppet_slack_version }}"
+matrix_mx_puppet_slack_container_image_self_build_dockerfile_path: "docker/Dockerfile-slack"
 
 # Controls whether the mx-puppet-slack container exposes its HTTP port (tcp/8432 in the container).
 #
@@ -16,8 +18,8 @@ matrix_mx_puppet_slack_container_image_self_build_repo: "https://github.com/Soru
 matrix_mx_puppet_slack_container_http_host_bind_port: ''
 
 matrix_mx_puppet_slack_version: latest
-matrix_mx_puppet_slack_docker_image: "{{ matrix_mx_puppet_slack_docker_image_name_prefix }}sorunome/mx-puppet-slack:{{ matrix_mx_puppet_slack_version }}"
-matrix_mx_puppet_slack_docker_image_name_prefix: "{{ 'localhost/' if matrix_mx_puppet_slack_container_image_self_build else matrix_container_global_registry_prefix }}"
+matrix_mx_puppet_slack_docker_image: "{{ matrix_mx_puppet_slack_docker_image_name_prefix }}beeper/mx-puppet-monorepo/slack:{{ matrix_mx_puppet_slack_version }}"
+matrix_mx_puppet_slack_docker_image_name_prefix: "{{ 'localhost/' if matrix_mx_puppet_slack_container_image_self_build else 'registry.gitlab.com/' }}"
 matrix_mx_puppet_slack_docker_image_force_pull: "{{ matrix_mx_puppet_slack_docker_image.endswith(':latest') }}"
 
 matrix_mx_puppet_slack_base_path: "{{ matrix_base_data_path }}/mx-puppet-slack"
diff --git a/roles/matrix-bridge-mx-puppet-slack/tasks/setup_install.yml b/roles/matrix-bridge-mx-puppet-slack/tasks/setup_install.yml
index 23301eab..b064ee83 100644
--- a/roles/matrix-bridge-mx-puppet-slack/tasks/setup_install.yml
+++ b/roles/matrix-bridge-mx-puppet-slack/tasks/setup_install.yml
@@ -79,6 +79,7 @@
     repo: "{{ matrix_mx_puppet_slack_container_image_self_build_repo }}"
     dest: "{{ matrix_mx_puppet_slack_docker_src_files_path }}"
     force: "yes"
+    version: "{{ matrix_mx_puppet_slack_container_image_self_build_version }}"
   register: matrix_mx_puppet_slack_git_pull_results
   when: "matrix_mx_puppet_slack_enabled|bool and matrix_mx_puppet_slack_container_image_self_build"
 
@@ -89,7 +90,7 @@
     force_source: "{{ matrix_mx_puppet_slack_git_pull_results.changed if ansible_version.major > 2 or ansible_version.minor >= 8 else omit }}"
     force: "{{ omit if ansible_version.major > 2 or ansible_version.minor >= 8 else matrix_mx_puppet_slack_git_pull_results.changed }}"
     build:
-      dockerfile: Dockerfile
+      dockerfile: "{{ matrix_mx_puppet_slack_container_image_self_build_dockerfile_path }}"
       path: "{{ matrix_mx_puppet_slack_docker_src_files_path }}"
       pull: true
   when: "matrix_mx_puppet_slack_enabled|bool and matrix_mx_puppet_slack_container_image_self_build"