diff --git a/Dockerfile b/Dockerfile
index cb1cb9e3..27ebd3cb 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,4 +1,4 @@
-FROM python:3.7-slim-buster
+FROM python:3.7-slim-buster@sha256:64d8fdeff90572068f5fb5e7fa0d67e28fa4629f54682a67156c6d6fbf3125b9
 RUN apt update && apt install curl make git libopenblas-base -y
 RUN curl -sSL https://raw.githubusercontent.com/sdispater/poetry/master/get-poetry.py | python
 ENV SHELL /bin/bash -l