diff --git a/test-in-docker/Dockerfile b/test-in-docker/Dockerfile
index 6af638f..79aacb7 100644
--- a/test-in-docker/Dockerfile
+++ b/test-in-docker/Dockerfile
@@ -1,26 +1,16 @@
 FROM debian:10 AS builder
 
-RUN apt-get update && apt-get install -y \
-   unzip \
-   libpcap-dev \
-   build-essential \
-   git \
-   cmake \
-   wget \
-   && rm -rf /var/lib/dpkg/lists/*
+RUN apt update && apt install -y unzip libpcap-dev build-essential git cmake && rm -rf /var/lib/dpkg/lists/*
 
 WORKDIR /src
 
 RUN git clone https://git.savannah.nongnu.org/git/lwip.git
 
-RUN wget http://elm-chan.org/fsw/ff/arc/ff14.zip && unzip -q ff14.zip -d ff && rm ff14.zip
+ADD http://elm-chan.org/fsw/ff/arc/ff14.zip .
+RUN unzip -q ff14.zip -d ff
 RUN sed -i -e 's/FF_FS_RPATH[	 ]*0/FF_FS_RPATH 2/;s/FF_USE_MKFS[	 ]*0/FF_USE_MKFS 1/;' ff/source/ffconf.h
 
-# sources
-COPY ["*.c", "*.h", "lwip-ftpd/"]
-# test sources
-COPY ./test-in-docker/src/ lwip-ftpd/test-in-docker/src/
-COPY ./test-in-docker/lwip-include/ lwip-ftpd/test-in-docker/lwip-include/
+COPY . lwip-ftpd
 
 WORKDIR /build
 
@@ -28,10 +18,7 @@ RUN cmake /src/lwip-ftpd/test-in-docker/src && make -j
 
 FROM debian:10 AS runner
 
-RUN apt-get update && apt-get install -y \
-   libpcap0.8 \
-   valgrind \
-   && rm -rf /var/lib/dpkg/lists/*
+RUN apt update && apt install -y libpcap0.8 valgrind && rm -rf /var/lib/dpkg/lists/*
 
 WORKDIR /app