diff --git a/Dockerfile b/Dockerfile
index 6ac7231..7d9468a 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,11 +1,11 @@
 FROM debian:10.4-slim AS builder
 
-RUN echo deb http://deb.debian.org/debian/ buster main non-free contrib >/etc/apt/sources.list &&\
- echo deb-src 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 contrib non-free >>/etc/apt/sources.list &&\
- echo deb-src http://security.debian.org/debian-security buster/updates main contrib non-free >>/etc/apt/sources.list &&\
- echo deb http://deb.debian.org/debian/ buster-updates main contrib non-free >>/etc/apt/sources.list &&\
- echo deb-src http://deb.debian.org/debian/ buster-updates main contrib non-free >>/etc/apt/sources.list
+RUN echo deb http://deb.debian.org/debian/ buster main >/etc/apt/sources.list &&\
+ echo deb-src http://deb.debian.org/debian/ buster main >>/etc/apt/sources.list &&\
+ echo deb http://security.debian.org/debian-security buster/updates main >>/etc/apt/sources.list &&\
+ echo deb-src http://security.debian.org/debian-security buster/updates main >>/etc/apt/sources.list &&\
+ echo deb http://deb.debian.org/debian/ buster-updates main >>/etc/apt/sources.list &&\
+ echo deb-src http://deb.debian.org/debian/ buster-updates main >>/etc/apt/sources.list
 
 RUN apt-get -y update &&\
     apt-get -y install make wget git gcc g++ lhasa libgmp-dev libmpfr-dev libmpc-dev flex bison gettext texinfo ncurses-dev autoconf rsync git lhasa
@@ -21,4 +21,6 @@ FROM debian:10.4-slim
 
 COPY --from=builder /opt/amiga /opt/amiga
 
-RUN apt-get -y install make git
+RUN echo deb http://deb.debian.org/debian/ buster main >/etc/apt/sources.list &&\
+    apt-get -y update &&\
+    apt-get -y install make git