diff --git a/electron-builder.yml b/electron-builder.yml
index d8f3b67..4abacd6 100644
--- a/electron-builder.yml
+++ b/electron-builder.yml
@@ -21,6 +21,11 @@ linux:
   target:
     - AppImage
     - deb
+    # tar.gz is what the in-app updater installs (pickAsset looks for a
+    # linux x86_64/amd64 tarball); arch must be x64 so the asset name ends
+    # in -linux-x86_64 like every published release.
+    - target: tar.gz
+      arch: x64
 
 # OS file associations: double-click / "Open with Folio" on Markdown and
 # plain-text files imports them as books (see folio:openPathOrImport and