diff --git a/Dockerfile b/Dockerfile
index 4d06e0b..f0974c2 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -4,11 +4,13 @@ WORKDIR /usr/src/app
 
 VOLUME /mapping
 
-COPY . /usr/src/app/
+COPY requirements.txt /usr/src/app/
 RUN pip install --no-cache-dir -r requirements.txt
 
-CMD ["python", "-u","/usr/src/app/server.py"]
-
 RUN DEBIAN_FRONTEND=noninteractive apt-get update \
  && DEBIAN_FRONTEND=noninteractive apt-get install -y --no-install-recommends \
       emacs-nox
+
+CMD ["python", "-u","/usr/src/app/server.py"]
+
+COPY . /usr/src/app/