diff --git a/.github/dependabot.yml b/.github/dependabot.yml
index 253bcb7..365eeec 100644
--- a/.github/dependabot.yml
+++ b/.github/dependabot.yml
@@ -4,3 +4,8 @@ updates:
     directory: /
     schedule:
       interval: daily
+
+  - package-ecosystem: docker
+    directory: /
+    schedule:
+      interval: daily
diff --git a/.github/workflows/package.yaml b/.github/workflows/package.yaml
index dd7748c..4b4f150 100644
--- a/.github/workflows/package.yaml
+++ b/.github/workflows/package.yaml
@@ -17,6 +17,9 @@ env:
   REGISTRY: ghcr.io
   IMAGE_NAME: ${{ github.repository }}
 
+permissions:
+  contents: read
+
 jobs:
   build-and-push-image:
     runs-on: ubuntu-latest
@@ -25,8 +28,13 @@ jobs:
       packages: write
 
     steps:
+      - name: Harden Runner
+        uses: step-security/harden-runner@128a63446a954579617e875aaab7d2978154e969 # v2.4.0
+        with:
+          egress-policy: audit
+
       - name: Checkout repository
-        uses: actions/checkout@v3
+        uses: actions/checkout@c85c95e3d7251135ab7dc9ce3241c5835cc595a9 # v3.5.3
 
       - name: Log in to the Container registry
         uses: docker/login-action@65b78e6e13532edd9afa3aa52ac7964289d1a9c1
diff --git a/Dockerfile b/Dockerfile
index 0e6fe1e..0d2bb77 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,4 +1,4 @@
-FROM alpine:3.18
+FROM alpine:3.18@sha256:82d1e9d7ed48a7523bdebc18cf6290bdb97b82302a8a9c27d4fe885949ea94d1
 
 LABEL maintainer="Jose Manuel Requena Plens <jmrplens@protonmail.com>"