diff --git a/.github/workflows/windows-build.yml b/.github/workflows/windows-build.yml
index 8ff7a23..fa64b8f 100644
--- a/.github/workflows/windows-build.yml
+++ b/.github/workflows/windows-build.yml
@@ -25,11 +25,22 @@ jobs:
       - name: Build/release Electron app
         uses: samuelmeuli/action-electron-builder@v1
         with:
+      - name: Calculate release version
+        id: version
+        shell: pwsh
+        env:
+          GH_TOKEN: ${{ secrets.GH_TOKEN != '' && secrets.GH_TOKEN || secrets.GITHUB_TOKEN }}
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+        run: |
+          $version = node scripts/ci/update-version.js
+          if ($LASTEXITCODE -ne 0) { exit $LASTEXITCODE }
+          "version=$version" | Out-File -FilePath $env:GITHUB_OUTPUT -Encoding utf8 -Append
+
           github_token: ${{ secrets.GH_TOKEN != '' && secrets.GH_TOKEN || secrets.GITHUB_TOKEN }}
           release: ${{ startsWith(github.ref, 'refs/tags/v') }}
           args: --win --x64 --publish always
-        env:
-          GH_TOKEN: ${{ secrets.GH_TOKEN != '' && secrets.GH_TOKEN || secrets.GITHUB_TOKEN }}
+          github_token: ${{ secrets.GH_TOKEN != '' && secrets.GH_TOKEN || secrets.GITHUB_TOKEN }}
+          release: true
           GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
 
       - name: Upload installer artifact
@@ -39,4 +50,4 @@ jobs:
           name: windows-installer
           path: |
             dist/**/*.exe
-            dist/**/*.blockmap
+          name: windows-installer-${{ steps.version.outputs.version }}
diff --git a/scripts/ci/update-version.js b/scripts/ci/update-version.js
new file mode 100644
index 0000000..befbfd1
--- /dev/null
+++ b/scripts/ci/update-version.js
@@ -0,0 +1,79 @@
+const fs = require('fs');
+const path = require('path');
+
+const repository = process.env.GITHUB_REPOSITORY;
+const authToken = process.env.GH_TOKEN || process.env.GITHUB_TOKEN || '';
+
+if (!repository) {
+  console.error('GITHUB_REPOSITORY is not defined.');
+  process.exit(1);
+}
+
+const isoDate = new Date().toISOString().slice(0, 10);
+
+async function fetchReleases() {
+  if (!authToken) {
+    return [];
+  }
+
+  const response = await fetch(`https://api.github.com/repos/${repository}/releases?per_page=100`, {
+    headers: {
+      Authorization: `Bearer ${authToken}`,
+      'User-Agent': 'picoGraph-release-bot'
+    }
+  });
+
+  if (!response.ok) {
+    const message = await response.text();
+    console.error(`Failed to fetch releases: ${response.status} ${message}`);
+    return [];
+  }
+
+  return response.json();
+}
+
+function determineNextVersion(releases) {
+  let index = 1;
+
+  for (const release of releases) {
+    const tag = typeof release.tag_name === 'string' ? release.tag_name.replace(/^v/, '') : '';
+    const match = tag.match(/^(\d{4}-\d{2}-\d{2})-(\d{2})$/);
+
+    if (match && match[1] === isoDate) {
+      index = Math.max(index, Number.parseInt(match[2], 10) + 1);
+    }
+  }
+
+  return `${isoDate}-${String(index).padStart(2, '0')}`;
+}
+
+function updateJson(filePath, version) {
+  if (!fs.existsSync(filePath)) {
+    return;
+  }
+
+  const data = JSON.parse(fs.readFileSync(filePath, 'utf8'));
+  data.version = version;
+
+  if (data.packages && data.packages['']) {
+    data.packages[''].version = version;
+  }
+
+  fs.writeFileSync(filePath, `${JSON.stringify(data, null, 2)}\n`, 'utf8');
+}
+
+(async () => {
+  try {
+    const releases = await fetchReleases();
+    const version = determineNextVersion(releases);
+    const root = process.cwd();
+
+    updateJson(path.join(root, 'package.json'), version);
+    updateJson(path.join(root, 'package-lock.json'), version);
+
+    console.log(version);
+  } catch (error) {
+    console.error(error instanceof Error ? error.message : String(error));
+    process.exit(1);
+  }
+})();