diff --git a/init.sh b/init.sh
index 9d40446..e93fd73 100644
--- a/init.sh
+++ b/init.sh
@@ -5,5 +5,7 @@ apt install -y build-essential libncurses-dev zlib1g-dev gawk git \
 gettext libssl-dev xsltproc rsync wget unzip python3 qemu-utils mkisofs zstd 
 
 # 下载并解压image builder
-imagebuilder_url="https://downloads.immortalwrt.org/releases/25.12.0/targets/x86/64/immortalwrt-imagebuilder-25.12.0-x86-64.Linux-x86_64.tar.zst"
-wget -O immortalwrt-imagebuilder.tar.zst $imagebuilder_url && tar -I zstd -xvf immortalwrt-imagebuilder.tar.zst --strip-components=1
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+version="25.12.0"
+file="immortalwrt-imagebuilder-$version-x86-64.tar.zst"
+url="https://downloads.immortalwrt.org/releases/$version/targets/x86/64/immortalwrt-imagebuilder-$version-x86-64.Linux-x86_64.tar.zst"
+wget -O $file $url && tar -I zstd -xvf $file 
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