diff --git a/.github/dependabot.yml b/.github/dependabot.yml
index fd83b11..e1b347e 100644
--- a/.github/dependabot.yml
+++ b/.github/dependabot.yml
@@ -8,3 +8,10 @@ updates:
     directory: / # Check the repository's workflows under /.github/workflows/
     schedule:
       interval: daily
+
+  # Configure check for outdated base image digest in the Dockerfile.
+  # See: https://docs.docker.com/build/building/best-practices/#pin-base-image-versions
+  - package-ecosystem: docker
+    directory: / # Check the repository's Dockerfile at /Dockerfile
+    schedule:
+      interval: weekly
diff --git a/Dockerfile b/Dockerfile
index 823a198..02bb8e7 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,4 +1,4 @@
-FROM python:3.13-alpine
+FROM python:3.13-alpine@sha256:399babc8b49529dabfd9c922f2b5eea81d611e4512e3ed250d75bd2e7683f4b0
 
 COPY LICENSE \
         README.md \