diff --git a/Dockerfile b/Dockerfile
index cb4d81f..791f616 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,9 +1,12 @@
-FROM java:8
+ARG JAVA_VERSION=14.0.2
+FROM java:${JAVA_VERSION}
 
 ENV MIN_MEM=512M
-ENV MAX_MEM=8G
+ENV MAX_MEM=1G
 ENV STOP="stop"
 
+ENV JAR=server.jar
+
 COPY ./bin/main /main
 COPY ./bin/cmd /usr/local/bin/cmd
 COPY ./entry.sh /entry.sh