diff --git a/.contrib/docker/Dockerfile.web b/.contrib/docker/Dockerfile.web
index 56fb192b5..36c14b712 100644
--- a/.contrib/docker/Dockerfile.web
+++ b/.contrib/docker/Dockerfile.web
@@ -1,6 +1,7 @@
 # This is Dockerfile for development purposes only.
 ARG PYTHON_VERSION='3'
 FROM python:${PYTHON_VERSION}-slim
+RUN pip install 'pip<20'
 RUN mkdir /code /code/production
 WORKDIR /code