diff --git a/mod/core/Dockerfile b/mod/core/Dockerfile
index a607936..4b85a79 100644
--- a/mod/core/Dockerfile
+++ b/mod/core/Dockerfile
@@ -10,10 +10,6 @@ ENV DEBIAN_FRONTEND noninteractive
 ENV container docker
 ENV DOCKERIZE_VERSION v0.6.1
 
-# just to speed up development, TODO: remove
-COPY sources.list /etc/apt/sources.list 
-
-
 RUN apt-get update && apt-get install -y software-properties-common language-pack-en wget
 RUN update-locale LANG=en_US.UTF-8
 RUN LC_CTYPE=C.UTF-8 add-apt-repository ppa:rmescandon/yq
diff --git a/mod/core/sources.list b/mod/core/sources.list
deleted file mode 100644
index dee2540..0000000
--- a/mod/core/sources.list
+++ /dev/null
@@ -1,5 +0,0 @@
-# Packages and Updates from the Hetzner Ubuntu Mirror
-deb http://mirror.hetzner.de/ubuntu/packages xenial           main restricted universe multiverse
-deb http://mirror.hetzner.de/ubuntu/packages xenial-updates   main restricted universe multiverse
-deb http://mirror.hetzner.de/ubuntu/packages xenial-backports main restricted universe multiverse
-deb http://mirror.hetzner.de/ubuntu/packages xenial-security  main restricted universe multiverse
\ No newline at end of file