diff --git a/.github/workflows/release.yml b/.github/workflows/release.yml
index a5c9bd3..7bb6f97 100644
--- a/.github/workflows/release.yml
+++ b/.github/workflows/release.yml
@@ -113,7 +113,8 @@ jobs:
       # - 1 "global" task that builds universal installers
       # - N "local" tasks that build each platform's binaries and platform-specific installers
       matrix: ${{ fromJson(needs.plan.outputs.val).ci.github.artifacts_matrix }}
-    runs-on: ${{ matrix.runner }}
+    # Existing signed tags can still contain cargo-dist's retired runner default.
+    runs-on: ${{ matrix.runner == 'macos-14' && 'macos-15' || matrix.runner }}
     timeout-minutes: 60
     container: ${{ matrix.container && matrix.container.image || null }}
     env:
diff --git a/dist-workspace.toml b/dist-workspace.toml
index 616b887..5bd55dd 100644
--- a/dist-workspace.toml
+++ b/dist-workspace.toml
@@ -26,3 +26,6 @@ hosting = "github"
 github-attestations = true
 # Whether to install an updater program
 install-updater = false
+
+[dist.github-custom-runners]
+aarch64-apple-darwin = "macos-15"
diff --git a/docs/specs/spec-process-cicd-release-publication.md b/docs/specs/spec-process-cicd-release-publication.md
index 546bc10..8ccbeb5 100644
--- a/docs/specs/spec-process-cicd-release-publication.md
+++ b/docs/specs/spec-process-cicd-release-publication.md
@@ -1,8 +1,8 @@
 ---
 title: CI/CD Workflow Specification - Manual Release Publication
-version: 1.2
+version: 1.3
 date_created: 2026-07-18
-last_updated: 2026-07-18
+last_updated: 2026-10-31
 owner: Zed Workspace Dock maintainers
 tags: [process, cicd, github-actions, release, cargo-dist, approval]
 ---
@@ -80,6 +80,7 @@ graph TD
 
 - Publication dispatches for the same tag are queued; a second run never overlaps the first.
 - Runners require network access for tool installation, dependencies, artifact storage, and release upload.
+- Apple Silicon builds use `macos-15`. The workflow maps `macos-14` entries from older tagged cargo-dist configurations to `macos-15`, preserving the selected source tag while avoiding the retired runner image.
 - The release approval must be granted before any distribution planning or building for a manual dispatch.
 
 ## Error Handling Strategy
@@ -124,6 +125,7 @@ graph TD
 
 | Version | Date | Changes |
 |---|---|---|
+| 1.3 | 2026-10-31 | Use macos-15 for Apple Silicon, including plans generated from older signed tags. |
 | 1.2 | 2026-07-18 | Renamed the approval environment to release-publication. |
 | 1.1 | 2026-07-18 | Added per-tag queued publication and dedicated validation responsibility. |
 | 1.0 | 2026-07-18 | Initial specification. |