diff --git a/scripts/agent-singbox.sh b/scripts/agent-singbox.sh
index 99689b0..4dac1d0 100644
--- a/scripts/agent-singbox.sh
+++ b/scripts/agent-singbox.sh
@@ -6,7 +6,7 @@ set -Eeuo pipefail
 
 # Build a version pinned to the configuration model tested by NexusGate.
 # Official builds do not guarantee the optional V2Ray statistics API.
-version='v1.12.23'
+version='v1.13.21'
 target='/usr/local/bin/nexusgate-sing-box'
 stats_target='/usr/local/bin/nexusgate-sing-box-stats'
 if [[ -x "$target" && -x "$stats_target" && "${2:-}" != '--force' ]]; then