diff --git a/.github/workflows/catalog.yml b/.github/workflows/catalog.yml
index 2dd7a62..300781b 100644
--- a/.github/workflows/catalog.yml
+++ b/.github/workflows/catalog.yml
@@ -108,7 +108,13 @@ jobs:
       # bundle; see the header of this script for what happens while core has
       # not published it yet.
       - name: Fetch package-ci harness
-        run: tools/fetch-package-ci.sh --out=package-ci --core-repo="${CORE_REPO}"
+        # The core version found above, not the release published last: a 7.0.x patch
+        # published after a 7.1 beta would otherwise bring the older builder.
+        # 0.0.0 means no core release was found; the newest bundle is then the best guess.
+        run: |
+          REF="${{ steps.core-version.outputs.version }}"
+          [ "$REF" = "0.0.0" ] && REF=""
+          tools/fetch-package-ci.sh --out=package-ci --core-repo="${CORE_REPO}" ${REF:+--ref="$REF"}
 
       - name: Check whether build-catalog.php has shipped yet
         id: builder
diff --git a/tools/fetch-package-ci.sh b/tools/fetch-package-ci.sh
index a4913e2..97f06d7 100755
--- a/tools/fetch-package-ci.sh
+++ b/tools/fetch-package-ci.sh
@@ -39,8 +39,8 @@
 #
 #   --out=DIR         where to assemble package-ci/  [default: package-ci]
 #   --core-repo=R     the core repository              [default: mindstellar/shopclass]
-#   --ref=REF         pin the fallback clone to this tag/branch instead of
-#                      auto-detecting the newest release tag
+#   --ref=REF         take the bundle from this release, and pin the fallback
+#                      clone to this tag/branch, instead of the newest release
 #
 # Exit codes: 0 = at least the required components (package-lint.php,
 # Compatibility.php, deprecated-api.json) are present in package-ci/;
@@ -140,8 +140,10 @@ try_release_tarball() {
   fi
 
   local asset_url
-  asset_url="$(printf '%s' "$releases" | jq -r '
+  # With --ref the bundle comes from that release; without it, from the newest one.
+  asset_url="$(printf '%s' "$releases" | jq -r --arg ref "$REF" '
     map(select(.draft == false))
+    | if $ref != "" then map(select(.tag_name == $ref)) else . end
     | sort_by(.published_at)
     | reverse
     | map(.assets[]? | select(.name == "shopclass-package-ci.tar.gz") | {url: .browser_download_url, tag: .tag_name})