diff --git a/.github/dependabot.yml b/.github/dependabot.yml
new file mode 100644
index 0000000000..ba346d51eb
--- /dev/null
+++ b/.github/dependabot.yml
@@ -0,0 +1,6 @@
+version: 2
+updates:
+  - package-ecosystem: docker
+    directory: /docker
+    schedule:
+      interval: weekly
diff --git a/.github/workflows/docker-base.yaml b/.github/workflows/docker-base.yaml
index 6dbdb731f0..f6c1633a6e 100644
--- a/.github/workflows/docker-base.yaml
+++ b/.github/workflows/docker-base.yaml
@@ -6,6 +6,8 @@ on:
     paths:
       - 'docker/Dockerfile'
       - 'scripts/ubuntu-build/**'
+  schedule:
+    - cron: '0 6 * * 1'
   workflow_dispatch:
 
 permissions:
diff --git a/docker/Dockerfile b/docker/Dockerfile
index fe7f71781f..38acfee8f3 100644
--- a/docker/Dockerfile
+++ b/docker/Dockerfile
@@ -1,6 +1,6 @@
 # syntax=docker/dockerfile:1-labs
 
-FROM ubuntu:26.04 AS base
+FROM ubuntu:26.04@sha256:678c6550cc43645e08669028bc177f50be4e7c5b8cca677067b1914d4afc7a03 AS base
 
 COPY scripts/ubuntu-build/ /opt