diff --git a/tools/zos-update-worker/internal/update_worker.go b/tools/zos-update-worker/internal/update_worker.go
index f0c546d18..41175abc8 100644
--- a/tools/zos-update-worker/internal/update_worker.go
+++ b/tools/zos-update-worker/internal/update_worker.go
@@ -112,6 +112,7 @@ func (w *Worker) updateZosVersion(network Network, manager client.Manager) error
 	type ChainVersion struct {
 		SafeToUpgrade bool   `json:"safe_to_upgrade"`
 		Version       string `json:"version"`
+		VersionLight  string `json:"version_light"`
 	}
 
 	var chainVersion ChainVersion
@@ -133,13 +134,18 @@ func (w *Worker) updateZosVersion(network Network, manager client.Manager) error
 	zosCurrent := fmt.Sprintf("%v/.tag-%v", w.src, chainVersion.Version)
 	zosLatest := fmt.Sprintf("%v/%v", w.dst, network)
 	// zos light
-	zosLightCurrent := fmt.Sprintf("%v/.tag-%v", w.src, chainVersion.Version)
-	zosLightLatest := fmt.Sprintf("%v/%v-v4", w.dst, network)
+	var zosLightCurrent string
+	var zosLightLatest string
+	// to handle the environments that aren't updated yet (mainnet)
+	if chainVersion.VersionLight != "" {
+		zosLightCurrent = fmt.Sprintf("%v/.tag-%v", w.src, chainVersion.VersionLight)
+		zosLightLatest = fmt.Sprintf("%v/%v-v4", w.dst, network)
+	}
 	// the link is like zosCurrent but it has the path relative from the symlink
 	// point of view (so relative to the symlink, how to reach zosCurrent)
 	// hence the link is instead used in all calls to symlink
 	zosLink := fmt.Sprintf("%v/.tag-%v", path, chainVersion.Version)
-	zosLightLink := fmt.Sprintf("%v/.tag-%v", path, chainVersion.Version)
+	zosLightLink := fmt.Sprintf("%v/.tag-%v", path, chainVersion.VersionLight)
 
 	// update links for both zos and zoslight
 	if err = w.updateLink(zosCurrent, zosLatest, zosLink); err != nil {