diff --git a/Dockerfile b/Dockerfile
index f311751..b3238f1 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,6 +1,6 @@
 # This Dockerfile is based on the pattern recommended by the pipenv docs:
 # https://pipenv.pypa.io/en/latest/docker.html
-FROM python:3.12 as builder
+FROM python:3.12@sha256:f78ea8a345769eb3aa1c86cf147dfd68f1a4508ed56f9d7574e4687b02f44dd1 as builder
 
 RUN pip install --no-cache-dir pipenv==2023.12.1
 ENV PIPENV_VENV_IN_PROJECT=1
@@ -11,7 +11,7 @@ RUN pipenv --no-site-packages install -v --deploy
 
 
 ############################################################
-FROM python:3.12-slim as final
+FROM python:3.12-slim@sha256:2be8daddbb82756f7d1f2c7ece706aadcb284bf6ab6d769ea695cc3ed6016743 as final
 
 WORKDIR /app
 COPY --from=builder /app/.venv /app/.venv