diff --git a/.env.example b/.env.example
index 4ffd8499..7c5f0603 100644
--- a/.env.example
+++ b/.env.example
@@ -46,7 +46,7 @@ CLAUDE_BETA_HEADER=claude-code-20250219,oauth-2025-04-20,interleaved-thinking-20
 # Antigravity 上游地址（可选，默认 sandbox）
 # ANTIGRAVITY_API_URL=https://daily-cloudcode-pa.sandbox.googleapis.com
 # Antigravity User-Agent（可选）
-# ANTIGRAVITY_USER_AGENT=antigravity/1.11.3 windows/amd64
+# ANTIGRAVITY_USER_AGENT=antigravity/1.15.8 windows/amd64
 
 # Claude Code（Anthropic Messages API）路由分流（无需额外环境变量）：
 # - /api             -> Claude 账号池（默认）
diff --git a/src/services/antigravityClient.js b/src/services/antigravityClient.js
index 9ce1eb93..dcdf4f1f 100644
--- a/src/services/antigravityClient.js
+++ b/src/services/antigravityClient.js
@@ -61,7 +61,7 @@ function getAntigravityHeaders(accessToken, baseUrl) {
 
   return {
     Host: host,
-    'User-Agent': process.env.ANTIGRAVITY_USER_AGENT || 'antigravity/1.11.3 windows/amd64',
+    'User-Agent': process.env.ANTIGRAVITY_USER_AGENT || 'antigravity/1.15.8 windows/amd64',
     Authorization: `Bearer ${accessToken}`,
     'Content-Type': 'application/json',
     'Accept-Encoding': 'gzip',