diff --git a/Dockerfile b/Dockerfile
index 7a076ea..3ce4737 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -6,6 +6,9 @@ RUN apk add --update --no-cache python3 python3-dev git build-base freetype-dev
 	if [ ! -e /usr/bin/python ]; then ln -f /usr/bin/python3 /usr/bin/python ; fi && \
 	if [ ! -e /usr/bin/pip ]; then ln -f /usr/bin/pip3 /usr/bin/pip ; fi
 
+RUN pip install --upgrade pip
+RUN pip install cython
+
 RUN git clone https://git.blackfinn.de/python/bicycle-statistics.git
 RUN cd bicycle-statistics && python setup.py install
 RUN rm -rf bicycle-statistics