diff --git a/Dockerfile b/Dockerfile
index 84a29824dd2a3918fcc106e1af7351ddae2c69e1..c69b9dbd840665109b948edca0ba65e9cfaf746b 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,7 +1,7 @@
 FROM node:15
 
 # See https://github.com/docker/for-linux/issues/1131 for the last apt-get option:
-RUN echo 'deb http://ftp.de.debian.org/debian sid main' >> '/etc/apt/sources.list' && \
+RUN echo 'deb http://ftp.de.debian.org/debian bullseye main' >> '/etc/apt/sources.list' && \
     apt-get update && apt-get install -y maven openjdk-17-jdk -o APT::Immediate-Configure=0
 
 RUN npm install -g @vue/cli@4.5.0