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+*   Replace `config.active_storage.queue` with two options that indicate which
+    queues analysis and purge jobs should use, respectively:
+
+    * `config.active_storage.queues.analysis`
+    * `config.active_storage.queues.purge`
+
+    `config.active_storage.queue` is preferred over the new options when it's
+    set, but it is deprecated and will be removed in Rails 6.1.
+
+    *George Claghorn*
+
+*   Permit generating variants of TIFF images.
+
+    *Luciano Sousa*
+
+*   Use base36 (all lowercase) for all new Blob keys to prevent
+    collisions and undefined behavior with case-insensitive filesystems and
+    database indices.
+
+    *Julik Tarkhanov*
+
+*   It doesn’t include an `X-CSRF-Token` header if a meta tag is not found on
+    the page. It previously included one with a value of `undefined`.
+
+    *Cameron Bothner*
+
+*   Fix `ArgumentError` when uploading to amazon s3
+
+    *Hiroki Sanpei*
+
+*   Add progressive JPG to default list of variable content types
+
+    *Maurice Kühlborn*
+
+*   Add `ActiveStorage.routes_prefix` for configuring generated routes.
+
+    *Chris Bisnett*
+
+*   `ActiveStorage::Service::AzureStorageService` only handles specifically
+    relevant types of `Azure::Core::Http::HTTPError`. It previously obscured
+    other types of `HTTPError`, which is the azure-storage gem’s catch-all
+    exception class.
+
+    *Cameron Bothner*
+
+*   `ActiveStorage::DiskController#show` generates a 404 Not Found response when
+    the requested file is missing from the disk service. It previously raised
+    `Errno::ENOENT`.
+
+    *Cameron Bothner*
+
+*   `ActiveStorage::Blob#download` and `ActiveStorage::Blob#open` raise
+    `ActiveStorage::FileNotFoundError` when the corresponding file is missing
+    from the storage service. Services translate service-specific missing object
+    exceptions (e.g. `Google::Cloud::NotFoundError` for the GCS service and
+    `Errno::ENOENT` for the disk service) into
+    `ActiveStorage::FileNotFoundError`.
+
+    *Cameron Bothner*
+
+*   Added the `ActiveStorage::SetCurrent` concern for custom Active Storage
+    controllers that can't inherit from `ActiveStorage::BaseController`.
+
+    *George Claghorn*
+
+*   Active Storage error classes like `ActiveStorage::IntegrityError` and
+    `ActiveStorage::UnrepresentableError` now inherit from `ActiveStorage::Error`
+    instead of `StandardError`. This permits rescuing `ActiveStorage::Error` to
+    handle all Active Storage errors.
+
+    *Andrei Makarov*, *George Claghorn*
+
+*   Uploaded files assigned to a record are persisted to storage when the record
+    is saved instead of immediately.
+
+    In Rails 5.2, the following causes an uploaded file in `params[:avatar]` to
+    be stored:
+
+    ```ruby
+    @user.avatar = params[:avatar]
+    ```
+
+    In Rails 6, the uploaded file is stored when `@user` is successfully saved.
+
+    *George Claghorn*
+
+*   Add the ability to reflect on defined attachments using the existing
+    ActiveRecord reflection mechanism.
+
+    *Kevin Deisz*
+
+*   Variant arguments of `false` or `nil` will no longer be passed to the
+    processor. For example, the following will not have the monochrome
+    variation applied:
+
+    ```ruby
+      avatar.variant(monochrome: false)
+    ```
+
+    *Jacob Smith*
+
+*   Generated attachment getter and setter methods are created
+    within the model's `GeneratedAssociationMethods` module to
+    allow overriding and composition using `super`.
+
+    *Josh Susser*, *Jamon Douglas*
+
+*   Add `ActiveStorage::Blob#open`, which downloads a blob to a tempfile on disk
+    and yields the tempfile. Deprecate `ActiveStorage::Downloading`.
+
+    *David Robertson*, *George Claghorn*
+
+*   Pass in `identify: false` as an argument when providing a `content_type` for
+    `ActiveStorage::Attached::{One,Many}#attach` to bypass automatic content
+    type inference. For example:
+
+    ```ruby
+      @message.image.attach(
+        io: File.open('/path/to/file'),
+        filename: 'file.pdf',
+        content_type: 'application/pdf',
+        identify: false
+      )
+    ```
+
+    *Ryan Davidson*
+
+*   The Google Cloud Storage service properly supports streaming downloads.
+    It now requires version 1.11 or newer of the google-cloud-storage gem.
+
+    *George Claghorn*
+
+*   Use the [ImageProcessing](https://github.com/janko-m/image_processing) gem
+    for Active Storage variants, and deprecate the MiniMagick backend.
+
+    This means that variants are now automatically oriented if the original
+    image was rotated. Also, in addition to the existing ImageMagick
+    operations, variants can now use `:resize_to_fit`, `:resize_to_fill`, and
+    other ImageProcessing macros. These are now recommended over raw `:resize`,
+    as they also sharpen the thumbnail after resizing.
+
+    The ImageProcessing gem also comes with a backend implemented on
+    [libvips](http://jcupitt.github.io/libvips/), an alternative to
+    ImageMagick which has significantly better performance than
+    ImageMagick in most cases, both in terms of speed and memory usage. In
+    Active Storage it's now possible to switch to the libvips backend by
+    changing `Rails.application.config.active_storage.variant_processor` to
+    `:vips`.
+
+    *Janko Marohnić*
+
+*   Rails 6 requires Ruby 2.5.0 or newer.
+
+    *Jeremy Daer*, *Kasper Timm Hansen*
+
+
+Please check [5-2-stable](https://github.com/rails/rails/blob/5-2-stable/activestorage/CHANGELOG.md) for previous changes.