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+*   Preserve display aspect ratio when extracting width and height from videos
+    with rectangular samples in `ActiveStorage::Analyzer::VideoAnalyzer`.
+
+    When a video contains a display aspect ratio, emit it in metadata as
+    `:display_aspect_ratio` rather than the ambiguous `:aspect_ratio`. Compute
+    its height by scaling its encoded frame width according to the DAR.
+
+    *George Claghorn*
+
+*   Use `after_destroy_commit` instead of `before_destroy` for purging
+    attachments when a record is destroyed.
+
+    *Hiroki Zenigami*
+
+
+*   Force `:attachment` disposition for specific, configurable content types.
+    This mitigates possible security issues such as XSS or phishing when
+    serving them inline. A list of such content types is included by default,
+    and can be configured via `content_types_to_serve_as_binary`.
+
+    *Rosa Gutierrez*
+
+
+## Rails 5.2.0.beta2 (November 28, 2017) ##
+
+*   Fix the gem adding the migrations files to the package.
+
+    *Yuji Yaginuma*
+
+
+## Rails 5.2.0.beta1 (November 27, 2017) ##
+
 *   Added to Rails.
 
     *DHH*