diff --git a/app/Dockerfile b/app/Dockerfile
index 63702a3..f329b24 100644
--- a/app/Dockerfile
+++ b/app/Dockerfile
@@ -1,4 +1,4 @@
-FROM python:3.7
+FROM python:3.7@sha256:2011a37d2a08fe83dd9ff923e0f83bfd7290152e2e6afe359bde1453170d9bdc
 EXPOSE 8501
 WORKDIR /app
 COPY requirements.txt ./requirements.txt