diff --git a/.github/workflows/check-renovatebot-config.yml b/.github/workflows/check-renovatebot-config.yml
index 7690d6e..6c91a84 100644
--- a/.github/workflows/check-renovatebot-config.yml
+++ b/.github/workflows/check-renovatebot-config.yml
@@ -7,10 +7,10 @@ on:
 jobs:
   validate:
     name: Validate renovatebot config
-    runs-on: ubuntu-20.04
+    runs-on: ubuntu-24.04
     steps:
       - name: Checkout
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
 
       - name: Validate
         uses: suzuki-shunsuke/github-action-renovate-config-validator@v0.1.3
diff --git a/.github/workflows/doctoc.yml b/.github/workflows/doctoc.yml
index 608ea23..6195760 100644
--- a/.github/workflows/doctoc.yml
+++ b/.github/workflows/doctoc.yml
@@ -8,11 +8,11 @@ on:
 jobs:
   verify-doctoc:
     name: Verifies whether table of contents has been updated
-    runs-on: ubuntu-20.04
+    runs-on: ubuntu-24.04
 
     steps:
       - name: Checkout code
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
 
       - name: Run doctoc on README
         run: npx doctoc README.md
diff --git a/.github/workflows/test-extract-metadata-action.yml b/.github/workflows/test-extract-metadata-action.yml
index d2df1c1..c79c9df 100644
--- a/.github/workflows/test-extract-metadata-action.yml
+++ b/.github/workflows/test-extract-metadata-action.yml
@@ -8,7 +8,7 @@ on:
 jobs:
   test-extract-metadata:
     name: Retrieves metadata
-    runs-on: ubuntu-20.04
+    runs-on: ubuntu-24.04
 
     steps:
       - name: Check that environment is empty
diff --git a/.github/workflows/test-healthcheck-action.yml b/.github/workflows/test-healthcheck-action.yml
index fe4e85b..3f97dc2 100644
--- a/.github/workflows/test-healthcheck-action.yml
+++ b/.github/workflows/test-healthcheck-action.yml
@@ -8,11 +8,11 @@ on:
 jobs:
   test-healthcheck-success:
     name: Verifies whether healthcheck action succeeds when it should
-    runs-on: ubuntu-20.04
+    runs-on: ubuntu-24.04
 
     steps:
       - name: Checkout code
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
 
       - name: Startup sample HTTP server
         run: docker run -d -p 8080:80 nginxdemos/hello
diff --git a/.github/workflows/test-setup-e2e-environment-action.yml b/.github/workflows/test-setup-e2e-environment-action.yml
index 6ddb279..a38378c 100644
--- a/.github/workflows/test-setup-e2e-environment-action.yml
+++ b/.github/workflows/test-setup-e2e-environment-action.yml
@@ -7,7 +7,7 @@ on:
 
 jobs:
   test-e2e-setup-action:
-    runs-on: ubuntu-20.04
+    runs-on: ubuntu-24.04
 
     strategy:
       matrix:
@@ -54,7 +54,7 @@ jobs:
 
     steps:
       - name: Checkout code
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
 
       - name: Retrieve branch name
         uses: HSLdevcom/jore4-tools/github-actions/extract-metadata@extract-metadata-v1
diff --git a/github-actions/run-cypress-tests/action.yml b/github-actions/run-cypress-tests/action.yml
index 0942946..7c8a048 100644
--- a/github-actions/run-cypress-tests/action.yml
+++ b/github-actions/run-cypress-tests/action.yml
@@ -50,7 +50,7 @@ runs:
     - name: Upload test reports as an artifact
       # should be run even if the tests fail
       if: always()
-      uses: actions/upload-artifact@v3
+      uses: actions/upload-artifact@v4
       with:
         name: cypress-docker-reports
         path: |