diff --git a/dev/8 b/dev/8
deleted file mode 100644
index 51909e9..0000000
--- a/dev/8
+++ /dev/null
@@ -1,11 +0,0 @@
-FROM node:8-buster-slim
-RUN sed -i 's/deb.debian.org/mirrors.ustc.edu.cn/g' /etc/apt/sources.list; \
-    sed -i 's|security.debian.org/debian-security|mirrors.ustc.edu.cn/debian-security|g' /etc/apt/sources.list; \
-    apt-get update; \
-    apt-get install -y --no-install-recommends build-essential zlib1g-dev libncurses5-dev \
-                   libgdbm-dev libnss3-dev libssl-dev libreadline-dev libffi-dev gcc g++ \
-                   libsqlite3-dev wget libbz2-dev coreutils util-linux ca-certificates wget \
-                   patch dstat vim curl git sudo glibc-source python3 python3-pip python2; \
-    apt-get clean; \ 
-    rm -rf /var/lib/apt/lists/*; \ 
-    ln -s /usr/bin/python3 /usr/bin/python
\ No newline at end of file