diff --git a/Rakefile b/Rakefile
index e69de29b..c3c83252 100644
--- a/Rakefile
+++ b/Rakefile
@@ -0,0 +1,9 @@
+##
+# To run theme rake tasks from the core Alaveteli directory you need to:
+#   rails -f lib/themes/whatdotheyknow-theme/Rakefile <task>
+#
+require "#{ENV['PWD']}/config/application"
+
+Rails.application.load_tasks
+
+Dir[File.join(__dir__, 'lib', 'tasks', '*.rake')].each { |file| load(file) }
diff --git a/lib/mailer_patches.rb b/lib/mailer_patches.rb
index 0b9e929a..4fb1ef00 100644
--- a/lib/mailer_patches.rb
+++ b/lib/mailer_patches.rb
@@ -8,4 +8,33 @@
   RequestMailer.class_eval do
     prepend ExcelAnalyzer::RequestMailer
   end
+
+  AlaveteliPro::SubscriptionMailer.class_eval do
+    include CurrencyHelper
+
+    def notify_price_increase(user, price_id)
+      auto_generated_headers(user)
+
+      subject = _('Changes to your {{pro_site_name}} subscription',
+                  pro_site_name: pro_site_name)
+
+      @user_name = user.name
+
+      price = AlaveteliPro::Price.new(Stripe::Price.retrieve(price_id))
+      @amount = format_currency(
+        price.unit_amount_with_tax, no_cents_if_whole: true
+      )
+      @interval = price.recurring['interval']
+      case @interval
+      when 'month'; @intervally = 'monthly'
+      when 'year'; @intervally = 'yearly'
+      end
+
+      mail_user(
+        user,
+        from: contact_for_user(@user),
+        subject: subject
+      )
+    end
+  end
 end
diff --git a/lib/tasks/alavetelitheme_tasks.rake b/lib/tasks/alavetelitheme_tasks.rake
index 1f1925bf..3d3f31cc 100644
--- a/lib/tasks/alavetelitheme_tasks.rake
+++ b/lib/tasks/alavetelitheme_tasks.rake
@@ -2,3 +2,53 @@
 # task :alavetelitheme do
 #   # Task goes here
 # end
+
+namespace :subscriptions do
+  task send_price_update_notice: :environment do
+    old_price, new_price = *load_prices
+
+    scope = Stripe::Subscription.list(price: old_price.id)
+    count = scope.data.size
+
+    scope.auto_paging_each.with_index do |subscription, index|
+      coupon = subscription.discount&.coupon
+      next if coupon&.percent_off == 100 && coupon&.duration == "forever"
+
+      user = User.joins(:pro_account).find_by(
+        pro_accounts: { stripe_customer_id: subscription.customer }
+      )
+      next unless user
+
+      AlaveteliPro::SubscriptionMailer.notify_price_increase(
+        user, new_price.id
+      ).deliver_later
+
+      erase_line
+      print "Queued email to WDTK Pro subscribers: #{index + 1}/#{count}"
+    end
+
+    erase_line
+    puts "Queued email to WDTK Pro subscribers: completed"
+  end
+
+  def load_prices
+    old_price = Stripe::Price.retrieve(ENV['OLD_PRICE']) if ENV['OLD_PRICE']
+    new_price = Stripe::Price.retrieve(ENV['NEW_PRICE']) if ENV['NEW_PRICE']
+
+    if !old_price
+      puts "ERROR: Can't find OLD_PRICE"
+      exit 1
+    elsif !new_price
+      puts "ERROR: Can't find NEW_PRICE"
+      exit 1
+    elsif old_price.recurring != new_price.recurring
+      puts "ERROR: Price interval and interval_count need to match"
+      exit 1
+    elsif !AlaveteliPro::Price.list.map(&:id).include?(new_price.id)
+      puts "ERROR: New price is not defined in general.yml"
+      exit 1
+    end
+
+    [old_price, new_price]
+  end
+end
diff --git a/lib/views/alaveteli_pro/subscription_mailer/notify_price_increase.text.erb b/lib/views/alaveteli_pro/subscription_mailer/notify_price_increase.text.erb
new file mode 100644
index 00000000..0948b85d
--- /dev/null
+++ b/lib/views/alaveteli_pro/subscription_mailer/notify_price_increase.text.erb
@@ -0,0 +1,58 @@
+Dear <%= @user_name %>,
+
+We're writing to let you know that the cost of your
+WhatDoTheyKnow Pro - https://www.whatdotheyknow.com/pro
+subscription is rising to <%= @amount %> per <%= @interval %>. You'll see this change
+reflected in your next bill.
+
+We hope you continue to see the value in your subscription
+https://www.whatdotheyknow.com/profile/subscriptions.
+
+This is the first time we've increased the cost of Pro since we
+launched with our introductory pricing in 2017. There are many
+features we want to introduce, to make WhatDoTheyKnow an even
+more powerful platform for your work, so we invest your <%= @intervally %>
+subscription directly into development and maintenance.
+
+People do great things with WhatDoTheyKnow Pro. Here are a few
+of the impacts we've seen from our users. We hope these will
+inspire you to think of new directions you could go in with Pro
+and if you've achieved something amazing through your usage too,
+please do let us know about it communications@mysociety.org.
+
+-------------------
+Sold From Under You
+-------------------
+The Bureau of Investigative Journalism revealed how much
+publicly-owed property had been sold off by councils as a result
+of austerity measures.
+
+https://www.mysociety.org/2019/06/05/case-study-sold-from-under-you-by-the-bureau-of-investigative-journalism/
+-------------------
+
+--------------------
+Chinese CCTV cameras
+--------------------
+Big Brother Watch secured a change in government policy when they
+showed that public authorities were using CCTV cameras with
+serious privacy vulnerabilities.
+
+https://www.mysociety.org/2023/02/09/foi-and-chinese-cctv-cameras/
+--------------------
+
+---------------------------
+Anti-environmental lobbying
+---------------------------
+Journalist Lucas Amin has broken several critical stories in
+national newspapers, uncovering the interests behind climate
+decisions made in government.
+
+https://www.mysociety.org/2023/06/02/revealing-vital-environmental-information-with-whatdotheyknow-pro/
+---------------------------
+
+Questions? Thoughts? Let us know - just hit 'reply' on this
+email.
+
+All the best,
+
+Gareth and the WhatDoTheyKnow team