diff --git a/data/sync/configs/20261025-release-rpms-gpg-key-race.yaml b/data/sync/configs/20261025-release-rpms-gpg-key-race.yaml
new file mode 100644
index 0000000..67d0e37
--- /dev/null
+++ b/data/sync/configs/20261025-release-rpms-gpg-key-race.yaml
@@ -0,0 +1,82 @@
+---
+# Roll out the release_rpms.yml GPG key upload fix to every repo that
+# carries it.
+#
+# Every OS leg of the build matrix signs with the same key and produces the
+# same RPM-GPG-KEY-SIMP-UNSTABLE-2.pub.asc, and every leg clobbered and
+# re-uploaded it. Run in parallel, those uploads race, so a leg fails with
+# 'already_exists' or 'Not Found' and cancels the others. During the
+# 2026-10-14 module releases many runs reported failure this way, even
+# though every release ended up with all of its assets. Only the first OS
+# in build_container_oses attaches the key now.
+#
+# release_rpms.yml (merge_github_workflows, scoped to that one file): the
+# template is shared by every project type, so the merge is widened from the
+# pupmod default to rubygem (rubygem-simp-cli) and simp_unknown (the
+# packaging repos). The template's header now says "standardized asset
+# baseline", like the other shared templates, instead of "puppet module
+# baseline". In the module repos that header line changes too; in
+# simp-adapter, simp-doc and simp-utils it already matches.
+#
+# Expected result (checked against every repo's current release_rpms.yml):
+# one PR in each of the 80 selected repos, changing only the key-upload
+# lines and, in the module repos, the header comment. merge_github_workflows
+# creates a workflow that a repo lacks, so the repolist selects only repos
+# that already have release_rpms.yml, and it excludes compliance_markup
+# (see the comment there).
+#
+# No version bump: .github/ changes don't affect release artifacts.
+#
+# Run with `repolist=20261025-release-rpms-gpg-key-race`.
+puppetsync::plan_config:
+  puppetsync:
+    permitted_project_types:
+      - pupmod
+      - pupmod_skeleton
+      - rubygem
+      - simp_unknown
+    plans:
+      sync:
+        github_api_delay_seconds: 1
+        merge_github_workflows:
+          files:
+            - release_rpms.yml
+          project_types:
+            - pupmod
+            - pupmod_skeleton
+            - rubygem
+            - simp_unknown
+        stages:
+          - install_gems
+          - checkout_git_feature_branch_in_each_repo
+          - merge_github_workflows
+          - git_commit_changes
+          - ensure_github_fork
+          - ensure_git_remote
+          - git_push_to_remote
+          - ensure_github_pr
+
+      approve_github_prs:
+        stages:
+          - approve_github_pr_for_each_repo
+
+      merge_github_prs:
+        stages:
+          - merge_github_pr_for_each_repo
+
+  git:
+    feature_branch: puppetsync/20261025-release-rpms-gpg-key-race
+    commit_message: |
+      [puppetsync] release_rpms: attach the GPG public key from one OS leg
+
+      Every OS leg of the build matrix signs with the same key and produces
+      the same RPM-GPG-KEY-SIMP-UNSTABLE-2.pub.asc, and every leg clobbered
+      and re-uploaded it. Run in parallel, those uploads raced, failing a
+      leg with 'already_exists' or 'Not Found' and cancelling the others,
+      even though the release usually ended up with all of its assets.
+
+      Only the first OS in build_container_oses attaches the key now.
+
+  github:
+    pr_user: silug  # This should be the account that *submitted* the PRs
+    approval_message: ':+1: :ghost:'
diff --git a/data/sync/repolists/20261025-release-rpms-gpg-key-race.yaml b/data/sync/repolists/20261025-release-rpms-gpg-key-race.yaml
new file mode 100644
index 0000000..6135af5
--- /dev/null
+++ b/data/sync/repolists/20261025-release-rpms-gpg-key-race.yaml
@@ -0,0 +1,40 @@
+---
+# Repolist for the 20261025-release-rpms-gpg-key-race session: every repo
+# that carries release_rpms.yml.
+#
+# The github-org dynamic inventory (see github-org.yaml for the selection
+# rule) covers the module repos. Of the rubygems only rubygem-simp-cli
+# carries release_rpms.yml, and the packaging repos below aren't matched by
+# github-org's include globs at all.
+#
+# merge_github_workflows CREATES a workflow that a repo lacks, so every repo
+# selected here must already have release_rpms.yml. Hence no `rubygem-*`
+# glob, and pupmod-simp-ufw (not yet released) is excluded.
+puppetsync::repos_source:
+  org: simp
+  include:
+    - 'pupmod-*'
+    - 'puppet-*'
+    - rubygem-simp-cli
+    # Packaging repos that carry release_rpms.yml
+    - pkg-r10k
+    - simp-adapter
+    - simp-doc
+    - simp-environment-skeleton
+    - simp-gpgkeys
+    - simp-rsync-skeleton
+    - simp-selinux-policy
+    - simp-utils
+  exclude:
+    # Held out of every session; see github-org.yaml
+    - pupmod-voxpupuli-selinux
+    - pupmod-simp-haveged
+    # Its release_rpms.yml and tag_deploy.yml predate the run-once/matrix
+    # split: tag_deploy dispatches release_rpms once per OS with a
+    # build_container_os input (for centos7/centos8). Merging only
+    # release_rpms.yml would leave tag_deploy sending an input that no
+    # longer exists. It has missed every sync since 2026-09-03, so it needs
+    # its own catch-up session.
+    - pupmod-simp-compliance_markup
+    # No release_rpms.yml yet (initial release still in review)
+    - pupmod-simp-ufw
diff --git a/modules/profile/files/_github/workflows/release_rpms.yml b/modules/profile/files/_github/workflows/release_rpms.yml
index 6fc8dda..529f52e 100644
--- a/modules/profile/files/_github/workflows/release_rpms.yml
+++ b/modules/profile/files/_github/workflows/release_rpms.yml
@@ -3,7 +3,7 @@
 #
 #             NOTICE: **This file is maintained with puppetsync**
 #
-# This file is updated automatically as part of a puppet module baseline.
+# This file is updated automatically as part of a standardized asset baseline.
 #
 # The next baseline sync will overwrite any local changes to this file!
 #
@@ -304,6 +304,11 @@ jobs:
         env:
           rpm_file_paths: ${{ steps.build-and-sign-rpm.outputs.rpm_file_paths }}
           rpm_gpg_file: ${{ steps.build-and-sign-rpm.outputs.rpm_gpg_file }}
+          # Every OS leg signs with the same key and produces an identically
+          # named .pub.asc; attach it from one leg only, or the legs' parallel
+          # clobber+upload of that one asset race each other
+          # ("already_exists" / "Not Found" from the releases API).
+          upload_gpg_file: ${{ matrix.os == fromJSON(github.event.inputs.build_container_oses)[0] }}
           release_id:  ${{ needs.resolve-release.outputs.release_id }}
           clobber: ${{ github.event.inputs.clobber }}
           clean: ${{ github.event.inputs.clean }}
@@ -352,8 +357,9 @@ jobs:
             const clobber = process.env.clobber == 'yes';
             const rpm_files = process.env.rpm_file_paths.split(/[\r\n]+/);
             const rpm_gpg_file = process.env.rpm_gpg_file;
+            const upload_files = process.env.upload_gpg_file == 'true' ? rpm_files.concat(rpm_gpg_file) : rpm_files;
 
-            let uploaded_files = rpm_files.concat(rpm_gpg_file).map(function(file){
+            let uploaded_files = upload_files.map(function(file){
               const name = path.basename(file)
               var content_type = 'application/pgp-keys'
               if( name.match(/\.rpm$/) ){