diff --git a/.github/workflows/build-container-image.yml b/.github/workflows/build-container-image.yml
index 260730004cc..af3b6a80b7b 100644
--- a/.github/workflows/build-container-image.yml
+++ b/.github/workflows/build-container-image.yml
@@ -35,7 +35,7 @@ jobs:
           - linux/arm64
 
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v5
 
       - name: Prepare
         env:
@@ -119,7 +119,7 @@ jobs:
       PUSH_TO_IMAGES: ${{ inputs.push_to_images }}
 
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v5
 
       - name: Download digests
         uses: actions/download-artifact@v4
diff --git a/.github/workflows/build-push-pr.yml b/.github/workflows/build-push-pr.yml
index 418993475f4..f6ff6521753 100644
--- a/.github/workflows/build-push-pr.yml
+++ b/.github/workflows/build-push-pr.yml
@@ -18,7 +18,7 @@ jobs:
     steps:
       # Repository needs to be cloned so `git rev-parse` below works
       - name: Clone repository
-        uses: actions/checkout@v4
+        uses: actions/checkout@v5
       - id: version_vars
         run: |
           echo mastodon_version_metadata=pr-${{ github.event.pull_request.number }}-$(git rev-parse --short ${{github.event.pull_request.head.sha}}) >> $GITHUB_OUTPUT
diff --git a/.github/workflows/bundler-audit.yml b/.github/workflows/bundler-audit.yml
index fa28d28f740..9cc49a7f797 100644
--- a/.github/workflows/bundler-audit.yml
+++ b/.github/workflows/bundler-audit.yml
@@ -28,7 +28,7 @@ jobs:
 
     steps:
       - name: Clone repository
-        uses: actions/checkout@v4
+        uses: actions/checkout@v5
 
       - name: Set up Ruby
         uses: ruby/setup-ruby@v1
diff --git a/.github/workflows/check-i18n.yml b/.github/workflows/check-i18n.yml
index c46090c1b56..9d500ffc44e 100644
--- a/.github/workflows/check-i18n.yml
+++ b/.github/workflows/check-i18n.yml
@@ -21,7 +21,7 @@ jobs:
     runs-on: ubuntu-latest
 
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v5
 
       - name: Set up Ruby environment
         uses: ./.github/actions/setup-ruby
diff --git a/.github/workflows/chromatic.yml b/.github/workflows/chromatic.yml
index 4e6179bc774..7c7213e2101 100644
--- a/.github/workflows/chromatic.yml
+++ b/.github/workflows/chromatic.yml
@@ -23,7 +23,7 @@ jobs:
     if: github.repository == 'mastodon/mastodon'
     steps:
       - name: Checkout code
-        uses: actions/checkout@v4
+        uses: actions/checkout@v5
         with:
           fetch-depth: 0
       - name: Set up Javascript environment
diff --git a/.github/workflows/codeql.yml b/.github/workflows/codeql.yml
index c864e12d2d8..a9a19389e34 100644
--- a/.github/workflows/codeql.yml
+++ b/.github/workflows/codeql.yml
@@ -31,7 +31,7 @@ jobs:
 
     steps:
       - name: Checkout repository
-        uses: actions/checkout@v4
+        uses: actions/checkout@v5
 
       # Initializes the CodeQL tools for scanning.
       - name: Initialize CodeQL
diff --git a/.github/workflows/crowdin-download-stable.yml b/.github/workflows/crowdin-download-stable.yml
index 8e18a9d0a0f..8a6ac6df277 100644
--- a/.github/workflows/crowdin-download-stable.yml
+++ b/.github/workflows/crowdin-download-stable.yml
@@ -13,7 +13,7 @@ jobs:
 
     steps:
       - name: Checkout
-        uses: actions/checkout@v4
+        uses: actions/checkout@v5
 
       - name: Increase Git http.postBuffer
         # This is needed due to a bug in Ubuntu's cURL version?
diff --git a/.github/workflows/crowdin-download.yml b/.github/workflows/crowdin-download.yml
index d247a514d92..89125fb2db4 100644
--- a/.github/workflows/crowdin-download.yml
+++ b/.github/workflows/crowdin-download.yml
@@ -15,7 +15,7 @@ jobs:
 
     steps:
       - name: Checkout
-        uses: actions/checkout@v4
+        uses: actions/checkout@v5
 
       - name: Increase Git http.postBuffer
         # This is needed due to a bug in Ubuntu's cURL version?
diff --git a/.github/workflows/crowdin-upload.yml b/.github/workflows/crowdin-upload.yml
index d0d79d91996..e2764b1ec75 100644
--- a/.github/workflows/crowdin-upload.yml
+++ b/.github/workflows/crowdin-upload.yml
@@ -23,7 +23,7 @@ jobs:
 
     steps:
       - name: Checkout
-        uses: actions/checkout@v4
+        uses: actions/checkout@v5
 
       - name: crowdin action
         uses: crowdin/github-action@v2
diff --git a/.github/workflows/format-check.yml b/.github/workflows/format-check.yml
index c10f350a02e..6803686b4ff 100644
--- a/.github/workflows/format-check.yml
+++ b/.github/workflows/format-check.yml
@@ -13,7 +13,7 @@ jobs:
 
     steps:
       - name: Clone repository
-        uses: actions/checkout@v4
+        uses: actions/checkout@v5
 
       - name: Set up Javascript environment
         uses: ./.github/actions/setup-javascript
diff --git a/.github/workflows/lint-css.yml b/.github/workflows/lint-css.yml
index c1385bf789b..51a78d679fc 100644
--- a/.github/workflows/lint-css.yml
+++ b/.github/workflows/lint-css.yml
@@ -34,7 +34,7 @@ jobs:
 
     steps:
       - name: Clone repository
-        uses: actions/checkout@v4
+        uses: actions/checkout@v5
 
       - name: Set up Javascript environment
         uses: ./.github/actions/setup-javascript
diff --git a/.github/workflows/lint-haml.yml b/.github/workflows/lint-haml.yml
index 499be2010ad..d3452c9ffc2 100644
--- a/.github/workflows/lint-haml.yml
+++ b/.github/workflows/lint-haml.yml
@@ -33,7 +33,7 @@ jobs:
 
     steps:
       - name: Clone repository
-        uses: actions/checkout@v4
+        uses: actions/checkout@v5
 
       - name: Set up Ruby
         uses: ruby/setup-ruby@v1
diff --git a/.github/workflows/lint-js.yml b/.github/workflows/lint-js.yml
index 86e9af23e7e..c9ba1a13f17 100644
--- a/.github/workflows/lint-js.yml
+++ b/.github/workflows/lint-js.yml
@@ -38,7 +38,7 @@ jobs:
 
     steps:
       - name: Clone repository
-        uses: actions/checkout@v4
+        uses: actions/checkout@v5
 
       - name: Set up Javascript environment
         uses: ./.github/actions/setup-javascript
diff --git a/.github/workflows/lint-ruby.yml b/.github/workflows/lint-ruby.yml
index 87f8aee24e0..e73617d85da 100644
--- a/.github/workflows/lint-ruby.yml
+++ b/.github/workflows/lint-ruby.yml
@@ -35,7 +35,7 @@ jobs:
 
     steps:
       - name: Clone repository
-        uses: actions/checkout@v4
+        uses: actions/checkout@v5
 
       - name: Set up Ruby
         uses: ruby/setup-ruby@v1
diff --git a/.github/workflows/test-js.yml b/.github/workflows/test-js.yml
index 0699e6c9ef8..b8e1cc89aaa 100644
--- a/.github/workflows/test-js.yml
+++ b/.github/workflows/test-js.yml
@@ -34,7 +34,7 @@ jobs:
 
     steps:
       - name: Clone repository
-        uses: actions/checkout@v4
+        uses: actions/checkout@v5
 
       - name: Set up Javascript environment
         uses: ./.github/actions/setup-javascript
diff --git a/.github/workflows/test-migrations.yml b/.github/workflows/test-migrations.yml
index 7aab34f0cf4..b1b94692f0c 100644
--- a/.github/workflows/test-migrations.yml
+++ b/.github/workflows/test-migrations.yml
@@ -72,7 +72,7 @@ jobs:
       BUNDLE_RETRY: 3
 
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v5
 
       - name: Set up Ruby environment
         uses: ./.github/actions/setup-ruby
diff --git a/.github/workflows/test-ruby.yml b/.github/workflows/test-ruby.yml
index 63d31725043..9816a44821f 100644
--- a/.github/workflows/test-ruby.yml
+++ b/.github/workflows/test-ruby.yml
@@ -32,7 +32,7 @@ jobs:
       SECRET_KEY_BASE_DUMMY: 1
 
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v5
 
       - name: Set up Ruby environment
         uses: ./.github/actions/setup-ruby
@@ -128,7 +128,7 @@ jobs:
           - '3.3'
           - '.ruby-version'
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v5
 
       - uses: actions/download-artifact@v4
         with:
@@ -230,7 +230,7 @@ jobs:
           - '3.3'
           - '.ruby-version'
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v5
 
       - uses: actions/download-artifact@v4
         with:
@@ -309,7 +309,7 @@ jobs:
           - '.ruby-version'
 
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v5
 
       - uses: actions/download-artifact@v4
         with:
@@ -447,7 +447,7 @@ jobs:
             search-image: opensearchproject/opensearch:2
 
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v5
 
       - uses: actions/download-artifact@v4
         with: