diff --git a/app/services/encryption_service.rb b/app/services/encryption_service.rb
index 8949d54a78a..3d0dbb92e21 100644
--- a/app/services/encryption_service.rb
+++ b/app/services/encryption_service.rb
@@ -7,6 +7,10 @@ def initialize
     password   = Rails.application.secrets.secret_key_base
     key        = ActiveSupport::KeyGenerator.new(password).generate_key(salt, len)
     @encryptor = ActiveSupport::MessageEncryptor.new(key)
+
+    # Remove after all encrypted attributes have been rotated.
+    legacy_key = ActiveSupport::KeyGenerator.new(password, hash_digest_class: OpenSSL::Digest::SHA1).generate_key(salt, len)
+    @encryptor.rotate legacy_key
   end
 
   def encrypt(value)
diff --git a/app/tasks/maintenance/rotate_api_particulier_token_encryption_task.rb b/app/tasks/maintenance/rotate_api_particulier_token_encryption_task.rb
new file mode 100644
index 00000000000..a47c6e13240
--- /dev/null
+++ b/app/tasks/maintenance/rotate_api_particulier_token_encryption_task.rb
@@ -0,0 +1,22 @@
+# frozen_string_literal: true
+
+module Maintenance
+  class RotateAPIParticulierTokenEncryptionTask < MaintenanceTasks::Task
+    def collection
+      # rubocop:disable DS/Unscoped
+      Procedure.unscoped.where.not(encrypted_api_particulier_token: nil)
+      # rubocop:enable DS/Unscoped
+    end
+
+    def process(procedure)
+      decrypted_token = procedure.api_particulier_token
+
+      procedure.api_particulier_token = decrypted_token
+      procedure.save!(validate: false)
+    end
+
+    def count
+      collection.count
+    end
+  end
+end
diff --git a/config/application.rb b/config/application.rb
index 91b64e496a3..b5798638850 100644
--- a/config/application.rb
+++ b/config/application.rb
@@ -13,7 +13,7 @@
 module TPS
   class Application < Rails::Application
     # Initialize configuration defaults for originally generated Rails version.
-    config.load_defaults 6.1
+    config.load_defaults 7.0
 
     # Configuration for the application, engines, and railties goes here.
     #
@@ -62,6 +62,8 @@ class Application < Rails::Application
     config.active_storage.queues.analysis = :active_storage_analysis
     config.active_storage.queues.purge = :purge
 
+    config.active_support.cache_format_version = 7.0
+
     config.to_prepare do
       # Make main application helpers available in administrate
       Administrate::ApplicationController.helper(TPS::Application.helpers)
diff --git a/config/initializers/active_storage.rb b/config/initializers/active_storage.rb
index f35c5e36b87..620e3f022d4 100644
--- a/config/initializers/active_storage.rb
+++ b/config/initializers/active_storage.rb
@@ -2,6 +2,7 @@
 
 Rails.application.config.active_storage.service_urls_expire_in = 1.hour
 
+Rails.application.config.active_storage.variant_processor = :mini_magick
 Rails.application.config.active_storage.analyzers.delete ActiveStorage::Analyzer::ImageAnalyzer
 Rails.application.config.active_storage.analyzers.delete ActiveStorage::Analyzer::VideoAnalyzer
 
diff --git a/config/initializers/cookie_rotator.rb b/config/initializers/cookie_rotator.rb
index 53b40ec8f10..e307467638c 100644
--- a/config/initializers/cookie_rotator.rb
+++ b/config/initializers/cookie_rotator.rb
@@ -1,20 +1,24 @@
 # frozen_string_literal: true
 
-# TODO: Enable cookies rotation when new SHA256 will be enforced
-# See new_framework_defaults_7.0.rb
-# key_generator_hash_digest_class = OpenSSL::Digest::SHA256 will be
-#
-# Rails.application.config.after_initialize do
-#   Rails.application.config.action_dispatch.cookies_rotations.tap do |cookies|
-#     salt = Rails.application.config.action_dispatch.authenticated_encrypted_cookie_salt
-#     secret_key_base = Rails.application.secret_key_base
+# This cookie rotator converts cookies from the old SHA1 hash (Rails 6) to SHA256 hash (Rails 7 default).
+# It should be kept enabled for approximately 1 month to ensure most users have their cookies rotated.
+# After this period, it can be safely removed.
+# Without this rotator, all users would have been signed out.
+Rails.application.config.after_initialize do
+  Rails.application.config.action_dispatch.cookies_rotations.tap do |cookies|
+    authenticated_encrypted_cookie_salt = Rails.application.config.action_dispatch.authenticated_encrypted_cookie_salt
+    signed_cookie_salt = Rails.application.config.action_dispatch.signed_cookie_salt
+    secret_key_base = Rails.application.secret_key_base
 
-#     key_generator = ActiveSupport::KeyGenerator.new(
-#       secret_key_base, iterations: 1000, hash_digest_class: OpenSSL::Digest::SHA1
-#     )
-#     key_len = ActiveSupport::MessageEncryptor.key_len
-#     secret = key_generator.generate_key(salt, key_len)
+    key_generator = ActiveSupport::KeyGenerator.new(
+      secret_key_base, iterations: 1000, hash_digest_class: OpenSSL::Digest::SHA1 # Rails 6 hash
+    )
+    key_len = ActiveSupport::MessageEncryptor.key_len
 
-#     cookies.rotate :encrypted, secret
-#   end
-# end
+    old_encrypted_secret = key_generator.generate_key(authenticated_encrypted_cookie_salt, key_len)
+    old_signed_secret = key_generator.generate_key(signed_cookie_salt)
+
+    cookies.rotate :encrypted, old_encrypted_secret
+    cookies.rotate :signed, old_signed_secret
+  end
+end
diff --git a/config/initializers/new_framework_defaults_7_0.rb b/config/initializers/new_framework_defaults_7_0.rb
deleted file mode 100644
index 389456e6af8..00000000000
--- a/config/initializers/new_framework_defaults_7_0.rb
+++ /dev/null
@@ -1,135 +0,0 @@
-# frozen_string_literal: true
-
-# Be sure to restart your server when you modify this file.
-#
-# This file eases your Rails 7.0 framework defaults upgrade.
-#
-# Uncomment each configuration one by one to switch to the new default.
-# Once your application is ready to run with all new defaults, you can remove
-# this file and set the `config.load_defaults` to `7.0`.
-#
-# Read the Guide for Upgrading Ruby on Rails for more info on each option.
-# https://guides.rubyonrails.org/upgrading_ruby_on_rails.html
-
-# `button_to` view helper will render `<button>` element, regardless of whether
-# or not the content is passed as the first argument or as a block.
-Rails.application.config.action_view.button_to_generates_button_tag = true
-
-# `stylesheet_link_tag` view helper will not render the media attribute by default.
-Rails.application.config.action_view.apply_stylesheet_media_default = false
-
-# Change the digest class for the key generators to `OpenSSL::Digest::SHA256`.
-# Changing this default means invalidate all encrypted messages generated by
-# your application and, all the encrypted cookies. Only change this after you
-# rotated all the messages using the key rotator.
-#
-# See upgrading guide for more information on how to build a rotator.
-# https://guides.rubyonrails.org/v7.0/upgrading_ruby_on_rails.html
-# Rails.application.config.active_support.key_generator_hash_digest_class = OpenSSL::Digest::SHA256
-
-# Change the digest class for ActiveSupport::Digest.
-# Changing this default means that for example Etags change and
-# various cache keys leading to cache invalidation.
-Rails.application.config.active_support.hash_digest_class = OpenSSL::Digest::SHA256
-
-# Don't override ActiveSupport::TimeWithZone.name and use the default Ruby
-# implementation.
-Rails.application.config.active_support.remove_deprecated_time_with_zone_name = true
-
-# Calls `Rails.application.executor.wrap` around test cases.
-# This makes test cases behave closer to an actual request or job.
-# Several features that are normally disabled in test, such as Active Record query cache
-# and asynchronous queries will then be enabled.
-Rails.application.config.active_support.executor_around_test_case = true
-
-# Define the isolation level of most of Rails internal state.
-# If you use a fiber based server or job processor, you should set it to `:fiber`.
-# Otherwise the default of `:thread` if preferable.
-Rails.application.config.active_support.isolation_level = :thread
-
-# Set both the `:open_timeout` and `:read_timeout` values for `:smtp` delivery method.
-Rails.application.config.action_mailer.smtp_timeout = 5
-
-# The ActiveStorage video previewer will now use scene change detection to generate
-# better preview images (rather than the previous default of using the first frame
-# of the video).
-Rails.application.config.active_storage.video_preview_arguments =
-  "-vf 'select=eq(n\\,0)+eq(key\\,1)+gt(scene\\,0.015),loop=loop=-1:size=2,trim=start_frame=1' -frames:v 1 -f image2"
-
-# Automatically infer `inverse_of` for associations with a scope.
-Rails.application.config.active_record.automatic_scope_inversing = true
-
-# Raise when running tests if fixtures contained foreign key violations
-Rails.application.config.active_record.verify_foreign_keys_for_fixtures = true
-
-# Disable partial inserts.
-# This default means that all columns will be referenced in INSERT queries
-# regardless of whether they have a default or not.
-Rails.application.config.active_record.partial_inserts = false
-
-# Protect from open redirect attacks in `redirect_back_or_to` and `redirect_to`.
-Rails.application.config.action_controller.raise_on_open_redirects = true
-
-# Change the variant processor for Active Storage.
-# Changing this default means updating all places in your code that
-# generate variants to use image processing macros and ruby-vips
-# operations. See the upgrading guide for detail on the changes required.
-# The `:mini_magick` option is not deprecated; it's fine to keep using it.
-Rails.application.config.active_storage.variant_processor = :mini_magick
-
-# Enable parameter wrapping for JSON.
-# Previously this was set in an initializer. It's fine to keep using that initializer if you've customized it.
-# To disable parameter wrapping entirely, set this config to `false`.
-Rails.application.config.action_controller.wrap_parameters_by_default = true
-
-# Specifies whether generated namespaced UUIDs follow the RFC 4122 standard for namespace IDs provided as a
-# `String` to `Digest::UUID.uuid_v3` or `Digest::UUID.uuid_v5` method calls.
-#
-# See https://guides.rubyonrails.org/configuring.html#config-active-support-use-rfc4122-namespaced-uuids for
-# more information.
-Rails.application.config.active_support.use_rfc4122_namespaced_uuids = true
-
-# Change the default headers to disable browsers' flawed legacy XSS protection.
-Rails.application.config.action_dispatch.default_headers = {
-  "X-Frame-Options" => "SAMEORIGIN",
-  "X-XSS-Protection" => "0",
-  "X-Content-Type-Options" => "nosniff",
-  "X-Download-Options" => "noopen",
-  "X-Permitted-Cross-Domain-Policies" => "none",
-  "Referrer-Policy" => "strict-origin-when-cross-origin"
-}
-
-# ** Please read carefully, this must be configured in config/application.rb **
-# Change the format of the cache entry.
-# Changing this default means that all new cache entries added to the cache
-# will have a different format that is not supported by Rails 6.1 applications.
-# Only change this value after your application is fully deployed to Rails 7.0
-# and you have no plans to rollback.
-# When you're ready to change format, add this to `config/application.rb` (NOT this file):
-#  config.active_support.cache_format_version = 7.0
-
-# Cookie serializer: 2 options
-#
-# If you're upgrading and haven't set `cookies_serializer` previously, your cookie serializer
-# is `:marshal`. The default for new apps is `:json`.
-#
-# Rails.application.config.action_dispatch.cookies_serializer = :json
-#
-#
-# To migrate an existing application to the `:json` serializer, use the `:hybrid` option.
-#
-# Rails transparently deserializes existing (Marshal-serialized) cookies on read and
-# re-writes them in the JSON format.
-#
-# It is fine to use `:hybrid` long term; you should do that until you're confident *all* your cookies
-# have been converted to JSON. To keep using `:hybrid` long term, move this config to its own
-# initializer or to `config/application.rb`.
-#
-# Rails.application.config.action_dispatch.cookies_serializer = :hybrid
-#
-#
-# If your cookies can't yet be serialized to JSON, keep using `:marshal` for backward-compatibility.
-#
-# If you have configured the serializer elsewhere, you can remove this section of the file.
-#
-# See https://guides.rubyonrails.org/action_controller_overview.html#cookies for more information.
diff --git a/spec/services/encryption_service_spec.rb b/spec/services/encryption_service_spec.rb
index 91540cc43bf..051c48cb131 100644
--- a/spec/services/encryption_service_spec.rb
+++ b/spec/services/encryption_service_spec.rb
@@ -41,4 +41,89 @@
       it { expect { subject }.to raise_exception StandardError }
     end
   end
+
+  describe "key rotation" do
+    let(:password) { Rails.application.secrets.secret_key_base }
+    let(:salt) { Rails.application.secrets.encryption_service_salt }
+    let(:len) { ActiveSupport::MessageEncryptor.key_len }
+    let(:value) { "Sensitive information" }
+
+    let(:legacy_key) do
+      ActiveSupport::KeyGenerator.new(password, hash_digest_class: OpenSSL::Digest::SHA1)
+        .generate_key(salt, len)
+    end
+
+    let(:new_key) do
+      ActiveSupport::KeyGenerator.new(password)
+        .generate_key(salt, len)
+    end
+
+    let(:legacy_encryptor) { ActiveSupport::MessageEncryptor.new(legacy_key) }
+    let(:new_encryptor) { ActiveSupport::MessageEncryptor.new(new_key) }
+
+    describe "#decrypt" do
+      subject { EncryptionService.new.decrypt(encrypted_value) }
+
+      context "with a value encrypted using the legacy SHA1-based key" do
+        let(:encrypted_value) { legacy_encryptor.encrypt_and_sign(value) }
+
+        it "successfully decrypts the value" do
+          expect(subject).to eq(value)
+        end
+      end
+
+      context "with a value encrypted using the new SHA256-based key" do
+        let(:encrypted_value) { new_encryptor.encrypt_and_sign(value) }
+
+        it "successfully decrypts the value" do
+          expect(subject).to eq(value)
+        end
+      end
+    end
+
+    describe "transition from legacy to new encryption" do
+      let(:legacy_service) do
+        legacy_encryption_service = EncryptionService.new
+        legacy_encryption_service.instance_variable_set(:@encryptor, legacy_encryptor)
+        legacy_encryption_service
+      end
+
+      let(:new_service) { EncryptionService.new }
+
+      it "can decrypt values encrypted with the legacy key" do
+        legacy_encrypted = legacy_service.encrypt(value)
+        expect(new_service.decrypt(legacy_encrypted)).to eq(value)
+      end
+
+      it "uses the new key for new encryptions" do
+        new_encrypted = new_service.encrypt(value)
+        expect { legacy_encryptor.decrypt_and_verify(new_encrypted) }
+          .to raise_error(ActiveSupport::MessageEncryptor::InvalidMessage)
+        expect(new_encryptor.decrypt_and_verify(new_encrypted)).to eq(value)
+      end
+    end
+
+    describe "backwards compatibility" do
+      let(:value) { "Important data" }
+      let(:old_service) do # Test with a service encrypting data without rotation mechanism
+        Class.new do
+          def initialize(key)
+            @encryptor = ActiveSupport::MessageEncryptor.new(key)
+          end
+
+          def encrypt(value)
+            @encryptor.encrypt_and_sign(value)
+          end
+        end
+      end
+
+      it "can decrypt values from a hypothetical old version without rotation" do
+        old_key = ActiveSupport::KeyGenerator.new(password, hash_digest_class: OpenSSL::Digest::SHA1)
+          .generate_key(salt, len)
+        old_encrypted = old_service.new(old_key).encrypt(value)
+
+        expect(EncryptionService.new.decrypt(old_encrypted)).to eq(value)
+      end
+    end
+  end
 end
diff --git a/spec/tasks/maintenance/rotate_api_particulier_token_encryption_task_spec.rb b/spec/tasks/maintenance/rotate_api_particulier_token_encryption_task_spec.rb
new file mode 100644
index 00000000000..a1d08e4ad47
--- /dev/null
+++ b/spec/tasks/maintenance/rotate_api_particulier_token_encryption_task_spec.rb
@@ -0,0 +1,50 @@
+# frozen_string_literal: true
+
+require "rails_helper"
+
+module Maintenance
+  RSpec.describe RotateAPIParticulierTokenEncryptionTask do
+    describe "#process" do
+      subject { described_class.process(procedure) }
+      let(:token) { "secret-token-0123456789" }
+      let(:procedure) { create(:procedure) }
+      let(:legacy_encryption_service) do
+        EncryptionService.new.tap { |legacy_service|
+          legacy_key = ActiveSupport::KeyGenerator
+            .new(Rails.application.secrets.secret_key_base, hash_digest_class: OpenSSL::Digest::SHA1)
+            .generate_key(Rails.application.secrets.encryption_service_salt, ActiveSupport::MessageEncryptor.key_len)
+          legacy_encryptor = ActiveSupport::MessageEncryptor.new(legacy_key)
+          legacy_service.instance_variable_set(:@encryptor, legacy_encryptor)
+        }
+      end
+
+      before do
+        # Encrypt the token using the legacy (SHA1) encryption service
+        legacy_encrypted_token = legacy_encryption_service.encrypt(token)
+        procedure.update_column(:encrypted_api_particulier_token, legacy_encrypted_token)
+      end
+
+      it 're-encrypts the api_particulier_token' do
+        old_encrypted_value = procedure.encrypted_api_particulier_token
+
+        expect { subject }.to change { procedure.reload.encrypted_api_particulier_token }
+        expect(procedure.api_particulier_token).to eq(token)
+
+        encrypted_value = procedure.encrypted_api_particulier_token
+
+        # Verify that the new encrypted value can't be decrypted with the legacy service
+        expect { legacy_encryption_service.decrypt(encrypted_value) }
+          .to raise_error(ActiveSupport::MessageEncryptor::InvalidMessage)
+
+        # Verify that the new encrypted value can be decrypted with the current service
+        current_service = EncryptionService.new
+        expect(current_service.decrypt(encrypted_value)).to eq(token)
+
+        # and with the services without rotations
+        current_service = EncryptionService.new
+        current_service.instance_variable_set(:@rotations, [])
+        expect(current_service.decrypt(encrypted_value)).to eq(token)
+      end
+    end
+  end
+end