diff --git a/README.md b/README.md
index 06ce7d0..3298664 100644
--- a/README.md
+++ b/README.md
@@ -11,8 +11,9 @@ package's upstream for a new release. When one is found it:
    release of **this** repository (tag `<pkgname>-<version>`),
 3. updates the `PKGBUILD` (pkgver/pkgrel/sha256sums), test-builds it with
    `makepkg` and regenerates `.SRCINFO`,
-4. commits the changes back to this repository, and
-5. pushes `PKGBUILD` + `.SRCINFO` to the AUR.
+4. commits the changes back to this repository,
+5. pushes `PKGBUILD` + `.SRCINFO` to the AUR, and
+6. deletes the package's superseded releases (older versions, tag included).
 
 The AUR packages themselves only download the prebuilt asset from step 2, so
 users don't need any build dependencies.
diff --git a/scripts/update-package.sh b/scripts/update-package.sh
index 1c5ee9e..1e8db1e 100644
--- a/scripts/update-package.sh
+++ b/scripts/update-package.sh
@@ -170,3 +170,22 @@ else
   git push origin HEAD:master
   echo "$pkg: pushed $ver-$rel to the AUR"
 fi
+
+### 6: prune superseded GitHub releases ######################################
+
+# Build-mode packages get one release per version; once a newer version is
+# fully published (asset built, PKGBUILD updated, AUR pushed - i.e. we got
+# this far) the older releases are no longer referenced by anything, so drop
+# them together with their tags. Runs every time to also catch leftovers.
+cd "$repo_root"
+if declare -f build_artifact >/dev/null; then
+  while IFS= read -r tag; do
+    [[ "$tag" == "$pkg-$ver" ]] && continue
+    rest="${tag#"$pkg-"}"
+    # only this package's tags: "<pkg>-<version>" (a pkgver never contains
+    # "-", which also keeps prefix-sharing package names apart)
+    [[ "$tag" == "$pkg-"* && "$rest" != *-* ]] || continue
+    echo "$pkg: deleting superseded release $tag"
+    gh release delete "$tag" --cleanup-tag --yes
+  done < <(gh release list --limit 100 --json tagName -q '.[].tagName')
+fi