diff --git a/docker/backend/Dockerfile b/docker/backend/Dockerfile
index ad3170f49..ec87803de 100644
--- a/docker/backend/Dockerfile
+++ b/docker/backend/Dockerfile
@@ -1,13 +1,12 @@
-FROM devfra.azurecr.io/de.fraport.build/tools:1.1.0
+FROM docker.io/fpco/stack-build:lts-18.0
 
-# DEBUG: list apt sources
-RUN grep ^ /etc/apt/sources.list /etc/apt/sources.list.d/*
+# add public key for nvidia cuda repositories
+RUN apt-key adv --keyserver keyserver.ubuntu.com --recv-keys A4B469963BF863CC
 
 ENV LANG=en_US.UTF-8
 
 # compile-time dependencies
-RUN apt-get -y update && apt-get -y install haskell-stack
-RUN apt-get -y update && apt-get -y install llvm
+# RUN apt-get -y update && apt-get -y install llvm
 # RUN apt-get -y update && apt-get -y install g++ libghc-zlib-dev libpq-dev libsodium-dev pkg-config
 # RUN apt-get -y update && DEBIAN_FRONTEND=noninteractive apt-get install -y --no-install-recommends tzdata
 # RUN apt-get -y update && apt-get -y install locales locales-all