diff --git a/.github/scripts/check-dep-changes-have-changeset.cjs b/.github/scripts/check-dep-changes-have-changeset.cjs
new file mode 100644
index 0000000000..92df3330bf
--- /dev/null
+++ b/.github/scripts/check-dep-changes-have-changeset.cjs
@@ -0,0 +1,132 @@
+#!/usr/bin/env node
+
+// Copyright 2026 The Lynx Authors. All rights reserved.
+// Licensed under the Apache License Version 2.0 that can be found in the
+// LICENSE file in the root directory of this source tree.
+const { execFileSync } = require('node:child_process');
+const { readFileSync } = require('node:fs');
+
+function gitShow(ref, path) {
+  try {
+    return execFileSync('git', ['show', `${ref}:${path}`], {
+      encoding: 'utf8',
+      stdio: ['pipe', 'pipe', 'pipe'],
+    });
+  } catch {
+    return null;
+  }
+}
+
+function changedPackageJsons(baseRef) {
+  const out = execFileSync(
+    'git',
+    ['diff', '--name-only', `${baseRef}...HEAD`],
+    { encoding: 'utf8' },
+  );
+  return out
+    .split('\n')
+    .filter((p) => p === 'package.json' || p.endsWith('/package.json'));
+}
+
+function isShallowEqual(a, b) {
+  const ka = Object.keys(a ?? {});
+  const kb = Object.keys(b ?? {});
+  if (ka.length !== kb.length) return false;
+  for (const k of ka) {
+    if (a?.[k] !== b?.[k]) return false;
+  }
+  return true;
+}
+
+function findMissingChangesets({
+  releases,
+  changedFiles,
+  readCurrent,
+  readBase,
+}) {
+  const willBump = new Set(releases.map((r) => r.name));
+  const missing = [];
+  for (const file of changedFiles) {
+    const cur = readCurrent(file);
+    const base = readBase(file);
+    if (cur === null || base === null) continue;
+    let curPkg;
+    let basePkg;
+    try {
+      curPkg = JSON.parse(cur);
+      basePkg = JSON.parse(base);
+    } catch {
+      continue;
+    }
+    if (curPkg.private) continue;
+    if (!curPkg.name) continue;
+    const depsChanged = !isShallowEqual(
+      curPkg.dependencies,
+      basePkg.dependencies,
+    );
+    const peerChanged = !isShallowEqual(
+      curPkg.peerDependencies,
+      basePkg.peerDependencies,
+    );
+    if ((depsChanged || peerChanged) && !willBump.has(curPkg.name)) {
+      missing.push({
+        name: curPkg.name,
+        path: file,
+        deps: depsChanged,
+        peer: peerChanged,
+      });
+    }
+  }
+  return missing;
+}
+
+module.exports = { findMissingChangesets, isShallowEqual };
+
+function main() {
+  const statusFile = process.argv[2] || '.changeset-status.json';
+  const baseRef = process.argv[3] || process.env.BASE_REF || 'origin/main';
+
+  const status = JSON.parse(readFileSync(statusFile, 'utf8'));
+  const releases = Array.isArray(status.releases) ? status.releases : [];
+
+  const missing = findMissingChangesets({
+    releases,
+    changedFiles: changedPackageJsons(baseRef),
+    readCurrent: (f) => {
+      try {
+        return readFileSync(f, 'utf8');
+      } catch {
+        return null;
+      }
+    },
+    readBase: (f) => gitShow(baseRef, f),
+  });
+
+  if (missing.length === 0) {
+    process.stdout.write(
+      'All package.json dependency/peerDependency changes have a matching changeset.\n',
+    );
+    return;
+  }
+
+  process.stderr.write(
+    '\nThe following packages changed `dependencies` or `peerDependencies` but no changeset bumps them:\n\n',
+  );
+  for (const m of missing) {
+    const what = [m.deps && 'dependencies', m.peer && 'peerDependencies']
+      .filter(Boolean)
+      .join(' + ');
+    process.stderr.write(`  - ${m.name}  [${what}]\n    ${m.path}\n`);
+  }
+  process.stderr.write(
+    '\nAdd a changeset (e.g. `pnpm changeset add`) bumping each affected package so the dependency change actually ships in the next release.\n',
+  );
+
+  throw new Error(
+    `${missing.length} package(s) with dep changes lack a changeset.`,
+  );
+}
+
+if (require.main === module) {
+  main();
+}
diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index ecc4a9a83d..f23e07fcbb 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -61,6 +61,8 @@ jobs:
         run: node .github/scripts/check-no-major-changeset.cjs .changeset-status.json
       - name: Changeset Heading Check
         run: node .github/scripts/check-no-heading-changeset.cjs .changeset-status.json
+      - name: Dependency Changeset Check
+        run: node .github/scripts/check-dep-changes-have-changeset.cjs .changeset-status.json
 
   eslint:
     needs: build