diff --git a/Dockerfile b/Dockerfile
index 391a633..253057e 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,4 +1,5 @@
 FROM debian:latest
+RUN apt-key update
 RUN apt-get update
 RUN apt-get -y upgrade
 RUN apt-get -y install openjdk-8-jre openjdk-8-jdk