diff --git a/.github/workflows/release.yml b/.github/workflows/release.yml
index 318aba6..883e809 100644
--- a/.github/workflows/release.yml
+++ b/.github/workflows/release.yml
@@ -190,6 +190,30 @@ jobs:
         if: ${{ steps.release.outputs.release_created }}
         run: npm publish --access public --ignore-scripts --tag ${{ steps.release-target.outputs.npm_tag }}
 
+      - name: Sync quantex alias package
+        if: ${{ steps.release.outputs.release_created }}
+        env:
+          QUANTEX_SYNC_TOKEN: ${{ secrets.QUANTEX_SYNC_TOKEN }}
+          RELEASE_TAG: ${{ steps.release.outputs.tag_name }}
+        run: |
+          version="${RELEASE_TAG#v}"
+
+          if [[ ! "${version}" =~ ^[0-9]+\.[0-9]+\.[0-9]+(-[0-9A-Za-z.-]+)?(\+[0-9A-Za-z.-]+)?$ ]]; then
+            echo "Release tag '${RELEASE_TAG}' did not resolve to a semver version without a leading v." >&2
+            exit 1
+          fi
+
+          npm_tag="latest"
+          if [[ "${version}" == *-* ]]; then
+            npm_tag="next"
+          fi
+
+          curl --fail-with-body -X POST \
+            -H "Authorization: Bearer ${QUANTEX_SYNC_TOKEN}" \
+            -H "Accept: application/vnd.github+json" \
+            https://api.github.com/repos/Drswith/quantex/dispatches \
+            -d "{\"event_type\":\"sync-quantex-cli-release\",\"client_payload\":{\"version\":\"${version}\",\"npm_tag\":\"${npm_tag}\"}}"
+
       - name: Upload release artifacts
         if: ${{ steps.release.outputs.release_created }}
         env:
diff --git a/openspec/changes/sync-alias-package-after-release/.openspec.yaml b/openspec/changes/sync-alias-package-after-release/.openspec.yaml
new file mode 100644
index 0000000..40cc12f
--- /dev/null
+++ b/openspec/changes/sync-alias-package-after-release/.openspec.yaml
@@ -0,0 +1,2 @@
+schema: spec-driven
+created: 2026-05-12
diff --git a/openspec/changes/sync-alias-package-after-release/design.md b/openspec/changes/sync-alias-package-after-release/design.md
new file mode 100644
index 0000000..02dc14f
--- /dev/null
+++ b/openspec/changes/sync-alias-package-after-release/design.md
@@ -0,0 +1,30 @@
+## Context
+
+The `Release` workflow publishes `quantex-cli` to npm from protected-branch release commits after release-please creates the GitHub Release, builds artifacts, and validates the package. The `quantex` alias package is maintained in `Drswith/quantex` and exposes its own `repository_dispatch` entry point for synchronized publishing.
+
+## Goals / Non-Goals
+
+**Goals:**
+
+- Notify `Drswith/quantex` only after the `quantex-cli` npm publish step succeeds.
+- Send the released `quantex-cli` version without a leading `v`.
+- Send `latest` for stable alias publishes and `next` for prerelease alias publishes.
+- Fail the release workflow if the dispatch API call is rejected, so maintainers see alias synchronization problems.
+
+**Non-Goals:**
+
+- Do not publish the `quantex` alias package from this repository.
+- Do not add a repository-local workflow wrapper for dispatching.
+- Do not change the existing `quantex-cli` npm publish tag behavior.
+
+## Decisions
+
+- Place the dispatch step immediately after `Publish npm package`. GitHub Actions step ordering already guarantees it only runs when prior release validation and npm publish succeeded.
+- Derive `version` from `steps.release.outputs.tag_name` by removing a leading `v`, matching the tag created by release-please while satisfying the alias repository payload contract.
+- Derive the alias payload tag from the semver version: versions containing `-` are prereleases and dispatch `npm_tag=next`; all others dispatch `npm_tag=latest`.
+- Use `curl --fail-with-body` with `QUANTEX_SYNC_TOKEN` so API failures stop the release job with visible response details.
+
+## Risks / Trade-offs
+
+- Missing or under-permissioned `QUANTEX_SYNC_TOKEN` -> the primary `quantex-cli` package will already be published, but the workflow will fail before artifact upload and require maintainer intervention.
+- GitHub API outage after npm publish -> the alias sync notification can fail independently of primary publish; rerunning the release workflow should retry the dispatch for the same release target.
diff --git a/openspec/changes/sync-alias-package-after-release/proposal.md b/openspec/changes/sync-alias-package-after-release/proposal.md
new file mode 100644
index 0000000..384c247
--- /dev/null
+++ b/openspec/changes/sync-alias-package-after-release/proposal.md
@@ -0,0 +1,27 @@
+## Why
+
+Quantex publishes `quantex-cli` as the primary npm package while `quantex` is an alias package maintained in a separate repository. The release workflow needs a durable handoff so a successful `quantex-cli` publish can trigger the alias repository to publish the same version.
+
+## What Changes
+
+- Add a post-npm-publish release workflow step that sends `repository_dispatch` to `Drswith/quantex`.
+- Include the published `quantex-cli` semver version without a leading `v` in the dispatch payload.
+- Send `npm_tag=latest` for stable releases and `npm_tag=next` for prereleases.
+- Keep alias package publishing owned by the `quantex` repository; `quantex-cli` only sends the notification.
+- Use the `QUANTEX_SYNC_TOKEN` secret for the GitHub API call.
+
+## Capabilities
+
+### New Capabilities
+
+None.
+
+### Modified Capabilities
+
+- `release-workflow`: the publish phase must notify the alias package repository after `quantex-cli` npm publishing succeeds.
+
+## Impact
+
+- Affected workflow: `.github/workflows/release.yml`.
+- Affected docs/specs: `openspec/specs/release-workflow/spec.md` via this change delta.
+- External dependency: repository secret `QUANTEX_SYNC_TOKEN` with sufficient permission to dispatch events to `Drswith/quantex`.
diff --git a/openspec/changes/sync-alias-package-after-release/specs/release-workflow/spec.md b/openspec/changes/sync-alias-package-after-release/specs/release-workflow/spec.md
new file mode 100644
index 0000000..2792ce7
--- /dev/null
+++ b/openspec/changes/sync-alias-package-after-release/specs/release-workflow/spec.md
@@ -0,0 +1,25 @@
+## ADDED Requirements
+
+### Requirement: Release Workflow Dispatches Alias Package Sync After Npm Publish
+
+The Release workflow SHALL notify the `Drswith/quantex` alias package repository after `quantex-cli` is successfully published to npm, and it MUST NOT publish the alias package directly from the `quantex-cli` repository.
+
+#### Scenario: Stable release dispatches latest alias sync
+
+- **WHEN** the Release workflow successfully publishes `quantex-cli` version `0.18.0` to npm
+- **THEN** it MUST send a `repository_dispatch` event to `Drswith/quantex`
+- **AND** the event type MUST be `sync-quantex-cli-release`
+- **AND** the client payload version MUST be `0.18.0`
+- **AND** the client payload `npm_tag` MUST be `latest`
+
+#### Scenario: Prerelease dispatches next alias sync
+
+- **WHEN** the Release workflow successfully publishes `quantex-cli` version `0.18.0-beta.1` to npm
+- **THEN** it MUST send a `repository_dispatch` event to `Drswith/quantex`
+- **AND** the client payload version MUST be `0.18.0-beta.1`
+- **AND** the client payload `npm_tag` MUST be `next`
+
+#### Scenario: Npm publish does not succeed
+
+- **WHEN** the Release workflow does not successfully publish `quantex-cli` to npm
+- **THEN** it MUST NOT send the alias package synchronization dispatch
diff --git a/openspec/changes/sync-alias-package-after-release/tasks.md b/openspec/changes/sync-alias-package-after-release/tasks.md
new file mode 100644
index 0000000..b10e677
--- /dev/null
+++ b/openspec/changes/sync-alias-package-after-release/tasks.md
@@ -0,0 +1,10 @@
+## 1. Release Workflow
+
+- [x] 1.1 Add a post-npm-publish `repository_dispatch` step in `.github/workflows/release.yml`.
+- [x] 1.2 Derive the alias dispatch payload version without a leading `v` and map prerelease versions to `npm_tag=next`.
+
+## 2. Validation
+
+- [x] 2.1 Run `bun run lint`, `bun run format:check`, `bun run typecheck`, and `bun run test`.
+- [x] 2.2 Run `bun run openspec:validate`.
+- [x] 2.3 Confirm git and OpenSpec closure state for handoff.