diff --git a/.github/workflows/release.yml b/.github/workflows/release.yml
index b917609..291533b 100644
--- a/.github/workflows/release.yml
+++ b/.github/workflows/release.yml
@@ -80,9 +80,10 @@ jobs:
           xmake --version
       - name: cert
         run: |
+          go build script/cert.go
           cd project/android
           echo "org.gradle.java.home=$JAVA_HOME_11_X64" >> gradle.properties
-          ../../script/cert.sh "${{ secrets.GITHUB_TOKEN }}" cert.tar.xz
+          ../../cert "${{ secrets.GITHUB_TOKEN }}" cert.tar.xz
           tar -xf cert.tar.xz
           rm cert.tar.xz
           ls -lh keystore.properties release.keystore
diff --git a/go.mod b/go.mod
new file mode 100644
index 0000000..682ea4b
--- /dev/null
+++ b/go.mod
@@ -0,0 +1,3 @@
+module github.com/zeromake/onscripter
+
+go 1.16
diff --git a/script/cert.go b/script/cert.go
new file mode 100644
index 0000000..ab25928
--- /dev/null
+++ b/script/cert.go
@@ -0,0 +1,29 @@
+package main
+
+import (
+	"encoding/base64"
+	"log"
+	"os"
+)
+
+func main() {
+	var cert = os.Args[1]
+	var out = os.Args[2]
+	bb, err := base64.StdEncoding.DecodeString(cert)
+	if err != nil {
+		log.Fatal(err)
+	}
+	f, err := os.OpenFile(out, os.O_CREATE|os.O_WRONLY, 0644)
+	if err != nil {
+		log.Fatal(err)
+	}
+	_, err = f.Write(bb)
+	if err != nil {
+		log.Fatal(err)
+	}
+	err = f.Close()
+	if err != nil {
+		log.Fatal(err)
+	}
+	log.Println("done")
+}