diff --git a/.github/workflows/backend-ci.yml b/.github/workflows/backend-ci.yml
index 3ea8860a..e5624f86 100644
--- a/.github/workflows/backend-ci.yml
+++ b/.github/workflows/backend-ci.yml
@@ -19,7 +19,7 @@ jobs:
           cache: true
       - name: Verify Go version
         run: |
-          go version | grep -q 'go1.25.5'
+          go version | grep -q 'go1.25.6'
       - name: Unit tests
         working-directory: backend
         run: make test-unit
@@ -38,7 +38,7 @@ jobs:
           cache: true
       - name: Verify Go version
         run: |
-          go version | grep -q 'go1.25.5'
+          go version | grep -q 'go1.25.6'
       - name: golangci-lint
         uses: golangci/golangci-lint-action@v9
         with:
diff --git a/.github/workflows/release.yml b/.github/workflows/release.yml
index 0415000d..f45c1a0b 100644
--- a/.github/workflows/release.yml
+++ b/.github/workflows/release.yml
@@ -115,7 +115,7 @@ jobs:
 
       - name: Verify Go version
         run: |
-          go version | grep -q 'go1.25.5'
+          go version | grep -q 'go1.25.6'
 
       # Docker setup for GoReleaser
       - name: Set up QEMU
diff --git a/.github/workflows/security-scan.yml b/.github/workflows/security-scan.yml
index 160a0df9..dfb8e37e 100644
--- a/.github/workflows/security-scan.yml
+++ b/.github/workflows/security-scan.yml
@@ -22,7 +22,7 @@ jobs:
           cache-dependency-path: backend/go.sum
       - name: Verify Go version
         run: |
-          go version | grep -q 'go1.25.5'
+          go version | grep -q 'go1.25.6'
       - name: Run govulncheck
         working-directory: backend
         run: |
diff --git a/Dockerfile b/Dockerfile
index b3320300..3d4b5094 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -7,7 +7,7 @@
 # =============================================================================
 
 ARG NODE_IMAGE=node:24-alpine
-ARG GOLANG_IMAGE=golang:1.25.5-alpine
+ARG GOLANG_IMAGE=golang:1.25.6-alpine
 ARG ALPINE_IMAGE=alpine:3.20
 ARG GOPROXY=https://goproxy.cn,direct
 ARG GOSUMDB=sum.golang.google.cn
diff --git a/backend/go.mod b/backend/go.mod
index ad7d76b6..4c3e6246 100644
--- a/backend/go.mod
+++ b/backend/go.mod
@@ -1,6 +1,6 @@
 module github.com/Wei-Shaw/sub2api
 
-go 1.25.5
+go 1.25.6
 
 require (
 	entgo.io/ent v0.14.5
diff --git a/backend/internal/pkg/antigravity/oauth.go b/backend/internal/pkg/antigravity/oauth.go
index ee2a6c1a..c7d657b9 100644
--- a/backend/internal/pkg/antigravity/oauth.go
+++ b/backend/internal/pkg/antigravity/oauth.go
@@ -33,7 +33,7 @@ const (
 		"https://www.googleapis.com/auth/experimentsandconfigs"
 
 	// User-Agent（与 Antigravity-Manager 保持一致）
-	UserAgent = "antigravity/1.11.9 windows/amd64"
+	UserAgent = "antigravity/1.15.8 windows/amd64"
 
 	// Session 过期时间
 	SessionTTL = 30 * time.Minute