diff --git a/Dockerfile b/Dockerfile
index 3ad94ac..d782043 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -4,7 +4,7 @@ COPY build/java_policy /etc
 
 RUN buildDeps='software-properties-common git libtool cmake python-dev python3-pip python-pip libseccomp-dev' && \
     apt-get update && apt-get install -y python python3.5 python-pkg-resources python3-pkg-resources gcc g++ $buildDeps && \
-    add-apt-repository ppa:openjdk-r/ppa && apt-get update && apt-get install -y openjdk-9-jdk-headless && \
+    add-apt-repository ppa:openjdk-r/ppa && apt-get update && apt-get install -y openjdk-7-jdk && \
     pip3 install --no-cache-dir psutil gunicorn flask requests && \
     cd /tmp && git clone -b newnew  --depth 1 https://github.com/QingdaoU/Judger && cd Judger && \ 
     mkdir build && cd build && cmake .. && make && make install && cd ../bindings/Python && python3 setup.py install && \