diff --git a/runtime.lock.json b/runtime.lock.json
index 07d4df6a..84ce6645 100644
--- a/runtime.lock.json
+++ b/runtime.lock.json
@@ -3,6 +3,7 @@
   "sourceRef": "v0.0.1",
   "sourceRepository": "777genius/agent_teams_orchestrator",
   "releaseRepository": "777genius/claude_agent_teams_ui",
+  "releaseTag": "v1.2.0",
   "assets": {
     "darwin-arm64": {
       "file": "agent-teams-runtime-darwin-arm64-v0.0.1.tar.gz",
diff --git a/scripts/dev-with-runtime.mjs b/scripts/dev-with-runtime.mjs
index bf2cf46b..2150756c 100644
--- a/scripts/dev-with-runtime.mjs
+++ b/scripts/dev-with-runtime.mjs
@@ -96,7 +96,10 @@ function getPlatformAssetKey() {
 }
 
 function getReleaseAssetUrl(runtimeLock, asset) {
-  return `https://github.com/${runtimeLock.releaseRepository}/releases/download/${runtimeLock.sourceRef}/${encodeURIComponent(asset.file)}`;
+  const releaseTag = typeof runtimeLock.releaseTag === 'string' && runtimeLock.releaseTag.trim().length > 0
+    ? runtimeLock.releaseTag.trim()
+    : runtimeLock.sourceRef;
+  return `https://github.com/${runtimeLock.releaseRepository}/releases/download/${releaseTag}/${encodeURIComponent(asset.file)}`;
 }
 
 function ensureDir(dirPath) {