diff --git a/.github/workflows/map-artifact.yml b/.github/workflows/map-artifact.yml
index 7fc2e6e..b2d8946 100644
--- a/.github/workflows/map-artifact.yml
+++ b/.github/workflows/map-artifact.yml
@@ -66,4 +66,6 @@ jobs:
         if: startsWith(github.ref, 'refs/tags/v')
         env:
           GH_TOKEN: ${{ github.token }}
-        run: gh release upload "$GITHUB_REF_NAME" dist/release/* --clobber
+        run: |
+          gh release view "$GITHUB_REF_NAME" >/dev/null 2>&1 || gh release create "$GITHUB_REF_NAME" --generate-notes --target "$GITHUB_SHA"
+          gh release upload "$GITHUB_REF_NAME" dist/release/* --clobber
diff --git a/.github/workflows/release.yml b/.github/workflows/release.yml
deleted file mode 100644
index 6870a58..0000000
--- a/.github/workflows/release.yml
+++ /dev/null
@@ -1,53 +0,0 @@
-name: release
-
-on:
-  push:
-    tags:
-      - 'v*'
-
-jobs:
-  release:
-    runs-on: ubuntu-latest
-    steps:
-      - name: Checkout monorepo
-        uses: actions/checkout@v7
-        with:
-          repository: interscript/interscript
-
-      - name: Bootstrap packages
-        run: ruby bootstrap.rb
-
-      - uses: ruby/setup-ruby@v1
-        with:
-          ruby-version: '3.3'
-          bundler-cache: true
-          working-directory: ruby
-
-      - uses: actions/setup-node@v7
-        with:
-          node-version: '22'
-          cache: npm
-          cache-dependency-path: js/package-lock.json
-
-      - name: Install gems
-        working-directory: ruby
-        run: bundle install --jobs 4 --retry 3 --with jsexec --without secryst
-
-      - name: Test Ruby package
-        working-directory: ruby
-        run: bundle exec rake
-
-      - name: Test JS package
-        working-directory: js
-        run: npm install && npm run prepareMaps && npm test
-
-      - name: Publish to rubygems.org
-        env:
-          RUBYGEMS_API_KEY: ${{ secrets.INTERSCRIPT_RUBYGEMS_API_KEY }}
-        working-directory: maps
-        run: |
-          mkdir -p ~/.gem
-          printf -- "---\n:rubygems_api_key: %s\n" "$RUBYGEMS_API_KEY" > ~/.gem/credentials
-          chmod 0600 ~/.gem/credentials
-          gem install gem-release
-          gem release
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 1125c55..8c3c0b8 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -7,6 +7,15 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## [Unreleased]
 
+## [2.5.0] — 2026-08-26
+
+- Corpus source format migrated from Ruby DSL (`.imp`) to ISC (`.isc`);
+  transliteration parity verified at 100% across all 289 systems.
+- New release channel: compiled JSON-IR artifacts
+  (`interscript-maps-ir-<version>.tar.gz` + `.sha256`) attached to
+  GitHub Releases by the `map-artifact` workflow; consumed by Workers
+  deployments via the Assets binding.
+
 ## [Latest]
 
 See GitHub releases for detailed release notes: https://github.com/interscript/maps/releases
diff --git a/interscript-maps.gemspec b/interscript-maps.gemspec
index c2069d7..d44bbf6 100644
--- a/interscript-maps.gemspec
+++ b/interscript-maps.gemspec
@@ -1,4 +1,4 @@
-INTERSCRIPT_MAPS_VERSION = "2.4.3"
+INTERSCRIPT_MAPS_VERSION = "2.5.0"
 
 Gem::Specification.new do |spec|
   spec.name          = "interscript-maps"