diff --git a/Dockerfile b/Dockerfile
index 8be4f4b..b553823 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -2,7 +2,7 @@
 # SPDX-License-Identifier: GPL-3.0-or-later
 # Atmosphere-Rebuild-Time: 2024-06-26T17:38:39Z
 
-FROM ghcr.io/vexxhost/openstack-venv-builder:2023.1 AS build
+FROM ghcr.io/vexxhost/openstack-venv-builder:2023.1@sha256:ba76c971596532bb88d44a4cb6d43a7363a68f941edc51e19300bb890ea2a1d8 AS build
 RUN <<EOF bash -xe
 uv pip install \
     --constraint /upper-constraints.txt \
@@ -21,7 +21,7 @@ uv pip install \
         python-swiftclient
 EOF
 
-FROM ghcr.io/vexxhost/python-base:2023.1
+FROM ghcr.io/vexxhost/python-base:2023.1@sha256:d380cd87f3036342578c2990ef66ec7a55665277052aa9d18392a1c7020df535
 COPY --from=build --link /var/lib/openstack /var/lib/openstack
 
 # NOTE(mnaser): The Magnum client relies on the SHELL environment variable