diff --git a/.github/dependabot.yml b/.github/dependabot.yml
index b18fd29..dd46ad5 100644
--- a/.github/dependabot.yml
+++ b/.github/dependabot.yml
@@ -1,6 +1,19 @@
 version: 2
 updates:
-  - package-ecosystem: 'github-actions'
-    directory: '/'
+  - package-ecosystem: bundler
+    directory: /
     schedule:
-      interval: 'weekly'
+      interval: weekly
+    groups:
+      dependencies:
+        dependency-type: production
+      dev-dependencies:
+        dependency-type: development
+    cooldown:
+      default-days: 7
+  - package-ecosystem: github-actions
+    directory: /
+    schedule:
+      interval: weekly
+    cooldown:
+      default-days: 7
diff --git a/.github/workflows/deploy.yml b/.github/workflows/deploy.yml
index e4669d4..61f3086 100644
--- a/.github/workflows/deploy.yml
+++ b/.github/workflows/deploy.yml
@@ -20,20 +20,20 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout
-        uses: actions/checkout@v6
+        uses: actions/checkout@8e8c483db84b4bee98b60c0593521ed34d9990e8 # v6.0.1
       - name: Setup Ruby
-        uses: ruby/setup-ruby@v1
+        uses: ruby/setup-ruby@708024e6c902387ab41de36e1669e43b5ee7085e # v1.283.0
         with:
           ruby-version: '4.0'
           bundler-cache: true
       - name: Setup Pages
         id: pages
-        uses: actions/configure-pages@v5
+        uses: actions/configure-pages@983d7736d9b0ae728b81ab479565c72886d7745b # v5.0.0
       - name: Build with middleman
         # Outputs to the './_site' directory by default
         run: bundle exec middleman build
       - name: Upload artifact
-        uses: actions/upload-pages-artifact@v4
+        uses: actions/upload-pages-artifact@7b1f4a764d45c48632c6b24a0339c27f5614fb0b # v4.0.0
 
   deploy:
     environment:
@@ -44,4 +44,4 @@ jobs:
     steps:
       - name: Deploy to GitHub Pages
         id: deployment
-        uses: actions/deploy-pages@v4
+        uses: actions/deploy-pages@d6db90164ac5ed86f2b6aed7e0febac5b3c0c03e # v4.0.5
diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index 7ce0839..2c5acaf 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -11,9 +11,9 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout
-        uses: actions/checkout@v6
+        uses: actions/checkout@8e8c483db84b4bee98b60c0593521ed34d9990e8 # v6.0.1
       - name: Setup Ruby
-        uses: ruby/setup-ruby@v1
+        uses: ruby/setup-ruby@708024e6c902387ab41de36e1669e43b5ee7085e # v1.283.0
         with:
           ruby-version: "4.0"
           bundler-cache: true
diff --git a/Dockerfile b/Dockerfile
index 8ff9393..ee9c012 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,6 +1,5 @@
-## Building image ##
-FROM ruby:3.4.8-slim-trixie AS builder
-# install build dependencies
+FROM ruby:4.0.1-slim-trixie AS builder
+
 RUN apt update && apt install make gcc g++ libffi-dev nodejs git -y
 COPY ./Gemfile /app/Gemfile
 COPY ./Gemfile.lock /app/Gemfile.lock