diff --git a/backend/internal/pkg/claude/constants.go b/backend/internal/pkg/claude/constants.go
index dfca252f..973bf79f 100644
--- a/backend/internal/pkg/claude/constants.go
+++ b/backend/internal/pkg/claude/constants.go
@@ -48,9 +48,9 @@ const APIKeyHaikuBetaHeader = BetaInterleavedThinking
 var DefaultHeaders = map[string]string{
 	// Keep these in sync with recent Claude CLI traffic to reduce the chance
 	// that Claude Code-scoped OAuth credentials are rejected as "non-CLI" usage.
-	"User-Agent":                                "claude-cli/2.1.22 (external, cli)",
+	"User-Agent":                                "claude-cli/2.1.81 (external, cli)",
 	"X-Stainless-Lang":                          "js",
-	"X-Stainless-Package-Version":               "0.70.0",
+	"X-Stainless-Package-Version":               "0.80.0",
 	"X-Stainless-OS":                            "Linux",
 	"X-Stainless-Arch":                          "arm64",
 	"X-Stainless-Runtime":                       "node",
diff --git a/backend/internal/service/identity_service.go b/backend/internal/service/identity_service.go
index 428f5bfd..a006cea9 100644
--- a/backend/internal/service/identity_service.go
+++ b/backend/internal/service/identity_service.go
@@ -26,9 +26,9 @@ var (
 
 // 默认指纹值（当客户端未提供时使用）
 var defaultFingerprint = Fingerprint{
-	UserAgent:               "claude-cli/2.1.22 (external, cli)",
+	UserAgent:               "claude-cli/2.1.81 (external, cli)",
 	StainlessLang:           "js",
-	StainlessPackageVersion: "0.70.0",
+	StainlessPackageVersion: "0.80.0",
 	StainlessOS:             "Linux",
 	StainlessArch:           "arm64",
 	StainlessRuntime:        "node",