diff --git a/.github/workflows/actions/expire-servers/Dockerfile b/.github/workflows/actions/expire-servers/Dockerfile
new file mode 100644
index 0000000..5d3ac5b
--- /dev/null
+++ b/.github/workflows/actions/expire-servers/Dockerfile
@@ -0,0 +1,8 @@
+FROM ruby:3.2.0
+
+COPY Gemfile Gemfile.lock ./
+RUN bundle install
+
+COPY main.rb ./
+
+ENTRYPOINT ["ruby", "/main.rb"]
diff --git a/.github/workflows/actions/expire-servers/Gemfile b/.github/workflows/actions/expire-servers/Gemfile
new file mode 100644
index 0000000..3338203
--- /dev/null
+++ b/.github/workflows/actions/expire-servers/Gemfile
@@ -0,0 +1,3 @@
+source 'https://rubygems.org'
+
+gem 'nokogiri', '1.14.0'
diff --git a/.github/workflows/actions/expire-servers/Gemfile.lock b/.github/workflows/actions/expire-servers/Gemfile.lock
new file mode 100644
index 0000000..fd50fe5
--- /dev/null
+++ b/.github/workflows/actions/expire-servers/Gemfile.lock
@@ -0,0 +1,15 @@
+GEM
+  remote: https://rubygems.org/
+  specs:
+    nokogiri (1.14.0-x86_64-linux)
+      racc (~> 1.4)
+    racc (1.6.2)
+
+PLATFORMS
+  x86_64-linux
+
+DEPENDENCIES
+  nokogiri (= 1.14.0)
+
+BUNDLED WITH
+   2.4.1
diff --git a/.github/workflows/actions/expire-servers/action.yml b/.github/workflows/actions/expire-servers/action.yml
new file mode 100644
index 0000000..6d741fe
--- /dev/null
+++ b/.github/workflows/actions/expire-servers/action.yml
@@ -0,0 +1,5 @@
+name: 'Expire servers'
+description: 'Produces a new Servers.xml with expired servers removed and opens a pull request'
+runs:
+  using: 'docker'
+  image: 'Dockerfile'
diff --git a/.github/workflows/actions/expire-servers/main.rb b/.github/workflows/actions/expire-servers/main.rb
new file mode 100644
index 0000000..a7e1ed4
--- /dev/null
+++ b/.github/workflows/actions/expire-servers/main.rb
@@ -0,0 +1,81 @@
+require 'nokogiri'
+
+class ServerList
+  def initialize(xml)
+    @doc = Nokogiri::XML(xml)
+  end 
+
+  def remove(ids)
+    @doc
+      .css("ArrayOfServerItem ServerItem")
+      .select { |e| ids.include?(e.at_css('id').content) }
+      .each(&:remove)
+  end
+  
+  def to_xml
+    @doc.to_s
+  end
+end
+
+require 'uri'
+require 'net/http'
+require 'json'
+
+require 'date'
+
+class Server
+  MONTHS_TIL_EXPIRED = 3
+  attr_reader :id, :last_seen
+
+  def initialize(id: , last_seen:)
+    @id = id
+    @last_seen = last_seen
+  end
+
+  def expired?
+    @last_seen <= DateTime.now.prev_month(MONTHS_TIL_EXPIRED)
+  end
+end
+
+module TreeStats
+  class Servers
+    def self.all
+      response = fetch
+      parse(response.body)
+    end
+
+    def self.expired
+      all.select(&:expired?)
+    end
+  
+    def self.fetch
+      Net::HTTP.get_response(URI('https://servers.treestats.net/api/servers/'))
+    end
+  
+    def self.parse(body)
+      JSON
+        .parse(body)
+        .map do |server| 
+          Server.new(
+            id: server['guid'],
+            last_seen: DateTime.parse(server.dig('status', 'last_seen'))
+          )
+        end
+    end
+  end
+end
+
+FILE_PATH = '/github/workspace/Servers.xml'
+KEEP_PATH = '/github/workspace/keep'
+
+xml = File.read(FILE_PATH)
+server_list = ServerList.new(xml)
+expired = TreeStats::Servers.expired
+
+require 'csv'
+keep_ids = CSV.read(KEEP_PATH).flatten
+
+ids = expired.map(&:id).reject { |id| keep_ids.include?(id) }
+server_list.remove(ids)
+
+File.write(FILE_PATH, server_list.to_xml)
diff --git a/.github/workflows/maintenance.yml b/.github/workflows/maintenance.yml
new file mode 100644
index 0000000..0a529ff
--- /dev/null
+++ b/.github/workflows/maintenance.yml
@@ -0,0 +1,25 @@
+name: Maintenance
+
+on:
+  schedule:
+    - cron: '0 0 1 * *'
+
+  workflow_dispatch:
+
+jobs:
+
+  build:
+
+    runs-on: ubuntu-latest
+
+    steps:
+    - name: Checkout
+      uses: actions/checkout@v3
+    - name: Expire servers
+      uses: ./.github/workflows/actions/expire-servers
+    - name: Create Pull Request
+      uses: peter-evans/create-pull-request@v4
+      with:
+        branch: remove-expired-servers
+        delete-branch: true
+        title: 'Remove expired servers'
diff --git a/keep b/keep
new file mode 100644
index 0000000..1c55cdc
--- /dev/null
+++ b/keep
@@ -0,0 +1,2 @@
+26D70BC9-78E9-4DDC-BCFF-7D5B36F6AC17
+ce4ae843-7afa-48ea-82bb-21b25301e1c9