diff --git a/.github/workflows/dockerhub-release.yaml b/.github/workflows/dockerhub-release.yaml
index 5c1ec499..b82b5e3c 100644
--- a/.github/workflows/dockerhub-release.yaml
+++ b/.github/workflows/dockerhub-release.yaml
@@ -8,7 +8,7 @@ jobs:
     steps:
 
     - name: Checkout code
-      uses: actions/checkout@ee0669bd1cc54295c223e0bb666b733df41de1c5 # v2
+      uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v2
 
     - name: Get the version
       id: tag
@@ -18,14 +18,14 @@ jobs:
       uses: docker/setup-buildx-action@f211e3e9ded2d9377c8cadc4489a4e38014bc4c9v# v1
 
     - name: Login to DockerHub
-      uses: docker/login-action@dd4fa0671be5250ee6f50aedf4cb05514abda2c7 # v1
+      uses: docker/login-action@dbcb813823bdd20940b903addbd779551569679f # v4.6.0
       with:
         username: ${{ secrets.DOCKERHUB_USERNAME }}
         password: ${{ secrets.DOCKERHUB_TOKEN }}
 
     - name: Build and push
       id: docker_build
-      uses: docker/build-push-action@ac9327eae2b366085ac7f6a2d02df8aa8ead720a # v2
+      uses: docker/build-push-action@53b7df96c91f9c12dcc8a07bcb9ccacbed38856a # v7.3.0
       with:
         push: true
         tags: bertrama/spectrum:${{ steps.tag.outputs.TAG }}
diff --git a/.github/workflows/dockerhub-unstable.yaml b/.github/workflows/dockerhub-unstable.yaml
index 855c65a6..1b66f26c 100644
--- a/.github/workflows/dockerhub-unstable.yaml
+++ b/.github/workflows/dockerhub-unstable.yaml
@@ -7,13 +7,13 @@ jobs:
     runs-on: ubuntu-latest
     steps:
     - name: Login to DockerHub
-      uses: docker/login-action@dd4fa0671be5250ee6f50aedf4cb05514abda2c7 # v1
+      uses: docker/login-action@dbcb813823bdd20940b903addbd779551569679f # v4.6.0
       with:
         username: ${{ secrets.DOCKERHUB_USERNAME }}
         password: ${{ secrets.DOCKERHUB_TOKEN }}
     - name: Build container image and push to DockerHub
       id: docker_build
-      uses: docker/build-push-action@ac9327eae2b366085ac7f6a2d02df8aa8ead720a # v2
+      uses: docker/build-push-action@53b7df96c91f9c12dcc8a07bcb9ccacbed38856a # v7.3.0
       with:
         push: true
         tags: 'bertrama/spectrum-unstable:${{ github.sha }},bertrama/spectrum-unstable:latest'
diff --git a/.github/workflows/tests.yml b/.github/workflows/tests.yml
index 7d9e4444..04fddb39 100644
--- a/.github/workflows/tests.yml
+++ b/.github/workflows/tests.yml
@@ -7,13 +7,13 @@ jobs:
   test:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@ee0669bd1cc54295c223e0bb666b733df41de1c5 # v2
+      - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v2
       - name: Create .env file
         run: cat .env-example .env-dev-values > .env
       - name: Load .env file
-        uses: xom9ikk/dotenv@d3ff95524814ceac377510f30f4af6296ea612c1 # v1.0.2
+        uses: xom9ikk/dotenv@d0a56edc74279820eabbe34477511327e710d0de # v2.4.0
       - name: Set up Ruby 3.3.10
-        uses: ruby/setup-ruby@c4e5b1316158f92e3d49443a9d58b31d25ac0f8f # v1
+        uses: ruby/setup-ruby@95ef2b042f9d7a56d8268cba8559e2842e2ad01b # v1
         with:
           ruby-version: 3.3.10
           bundler-cache: true
diff --git a/Dockerfile b/Dockerfile
index 96b02076..69274168 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,7 +1,7 @@
 ########
 # Base #
 ########
-FROM ruby:3.3@sha256:afa19c79787347bd739ea3f037d2686b8f938c0cfe154c6753455877e9f61a86 as base
+FROM ruby:4.0@sha256:d9a5d26be31a40fb043069f816ba39139c1f38758aea530341eb7e2c153e4ab4 as base
 
 #Set up variables for creating a user to run the app in the container
 ARG UID=1000