diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index b3f68f0..c5afb49 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -1,6 +1,10 @@
 # This workflow runs on Gitea Actions, which is API-compatible with GitHub Actions.
 # It performs CI on every push to main and every pull request, and automatically
 # builds and attaches a Linux amd64 release binary when a version tag (v*) is pushed.
+#
+# Go is installed manually from a Chinese mirror (NJU) instead of using
+# actions/setup-go, because the runner is in a region where the official Go
+# download endpoint is slow. GOPROXY is set to goproxy.cn for the same reason.
 name: CI / Release
 
 on:
@@ -19,11 +23,15 @@ jobs:
       - name: Checkout
         uses: actions/checkout@v4
 
-      - name: Set up Go
-        uses: actions/setup-go@v5
-        with:
-          go-version-file: go.mod
-          cache: true
+      - name: Install Go (Mirror in China)
+        run: |
+          if [ ! -d "/usr/local/go" ]; then
+            wget https://mirrors.nju.edu.cn/golang/go1.25.5.linux-amd64.tar.gz
+            sudo tar -C /usr/local -xzf go1.25.5.linux-amd64.tar.gz
+            rm go1.25.5.linux-amd64.tar.gz
+          fi
+          echo "/usr/local/go/bin" >> $GITHUB_PATH
+          echo "GOPROXY=https://goproxy.cn,direct" >> $GITHUB_ENV
 
       - name: Build
         run: go build ./...
@@ -50,11 +58,15 @@ jobs:
       - name: Checkout
         uses: actions/checkout@v4
 
-      - name: Set up Go
-        uses: actions/setup-go@v5
-        with:
-          go-version-file: go.mod
-          cache: true
+      - name: Install Go (Mirror in China)
+        run: |
+          if [ ! -d "/usr/local/go" ]; then
+            wget https://mirrors.nju.edu.cn/golang/go1.25.5.linux-amd64.tar.gz
+            sudo tar -C /usr/local -xzf go1.25.5.linux-amd64.tar.gz
+            rm go1.25.5.linux-amd64.tar.gz
+          fi
+          echo "/usr/local/go/bin" >> $GITHUB_PATH
+          echo "GOPROXY=https://goproxy.cn,direct" >> $GITHUB_ENV
 
       - name: Build release binary
         run: GOOS=linux GOARCH=amd64 go build -o spark-mcp-linux-amd64 ./main.go