diff --git a/actionview/CHANGELOG.md b/actionview/CHANGELOG.md
index 98ac2c1c22..d85681e0d1 100644
--- a/actionview/CHANGELOG.md
+++ b/actionview/CHANGELOG.md
@@ -1,3 +1,8 @@
+*   Fix stripping the digest from the automatically generated img tag alt
+    attribute when assets are handled by Sprockets >=3.0.
+
+    *Bart de Water*
+
 *   Create a new `ActiveSupport::SafeBuffer` instance when `content_for` is flushed.
 
     Fixes #19890
diff --git a/actionview/lib/action_view/helpers/asset_tag_helper.rb b/actionview/lib/action_view/helpers/asset_tag_helper.rb
index cc54faa778..413c35954c 100644
--- a/actionview/lib/action_view/helpers/asset_tag_helper.rb
+++ b/actionview/lib/action_view/helpers/asset_tag_helper.rb
@@ -239,7 +239,7 @@ module ActionView
       #   image_alt('underscored_file_name.png')
       #   # => Underscored file name
       def image_alt(src)
-        File.basename(src, '.*'.freeze).sub(/-[[:xdigit:]]{32}\z/, ''.freeze).tr('-_'.freeze, ' '.freeze).capitalize
+        File.basename(src, '.*'.freeze).sub(/-[[:xdigit:]]{32,64}\z/, ''.freeze).tr('-_'.freeze, ' '.freeze).capitalize
       end
 
       # Returns an HTML video tag for the +sources+. If +sources+ is a string,