diff --git a/Dockerfile b/Dockerfile
index 98bee844..cc66e64e 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -20,9 +20,9 @@ WORKDIR /app
 #EXPOSE 80
 
 
-RUN echo "deb http://deb.debian.org/debian buster main non-free contrib" > /etc/apt/sources.list && \
-    echo "deb http://security.debian.org/debian-security buster/updates main" >> /etc/apt/sources.list && \
-    echo "deb http://deb.debian.org/debian buster-updates main non-free contrib" >> /etc/apt/sources.list && \
+RUN echo "deb http://deb.debian.org/debian bullseye main non-free contrib" > /etc/apt/sources.list && \
+    echo "deb http://security.debian.org/debian-security bullseye-security main" >> /etc/apt/sources.list && \
+    echo "deb http://deb.debian.org/debian bullseye-updates main non-free contrib" >> /etc/apt/sources.list && \
     apt-get update -qq && \
     apt-get -y install libgdiplus libc6-dev