diff --git a/.github/workflows/build-container-image.yml b/.github/workflows/build-container-image.yml
index a1aeddf20..532921b1f 100644
--- a/.github/workflows/build-container-image.yml
+++ b/.github/workflows/build-container-image.yml
@@ -24,7 +24,7 @@ jobs:
     runs-on: ubuntu-latest
 
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
 
       - uses: docker/setup-qemu-action@v2
         if: contains(inputs.platforms, 'linux/arm64') && !inputs.use_native_arm64_builder
diff --git a/.github/workflows/build-push-pr.yml b/.github/workflows/build-push-pr.yml
index b95e3c14e..1f647e2a1 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@v3
+        uses: actions/checkout@v4
       - id: version_vars
         run: |
           echo mastodon_version_metadata=pr-${{ github.event.pull_request.number }}-$(git rev-parse --short HEAD) >> $GITHUB_OUTPUT
diff --git a/.github/workflows/bundler-audit.yml b/.github/workflows/bundler-audit.yml
index 6c4869f12..bfb93a36c 100644
--- a/.github/workflows/bundler-audit.yml
+++ b/.github/workflows/bundler-audit.yml
@@ -25,7 +25,7 @@ jobs:
 
     steps:
       - name: Clone repository
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
 
       - name: Install native Ruby dependencies
         run: sudo apt-get install -y libicu-dev libidn11-dev
diff --git a/.github/workflows/check-i18n.yml b/.github/workflows/check-i18n.yml
index b67c503e9..39cf32ddc 100644
--- a/.github/workflows/check-i18n.yml
+++ b/.github/workflows/check-i18n.yml
@@ -17,7 +17,7 @@ jobs:
     runs-on: ubuntu-22.04
 
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
 
       - name: Install system dependencies
         run: |
diff --git a/.github/workflows/codeql.yml b/.github/workflows/codeql.yml
index 8534501d4..3b40c3fd0 100644
--- a/.github/workflows/codeql.yml
+++ b/.github/workflows/codeql.yml
@@ -27,7 +27,7 @@ jobs:
 
     steps:
       - name: Checkout repository
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
 
       # Initializes the CodeQL tools for scanning.
       - name: Initialize CodeQL
diff --git a/.github/workflows/crowdin-download.yml b/.github/workflows/crowdin-download.yml
index f6b2579ce..e5385808d 100644
--- a/.github/workflows/crowdin-download.yml
+++ b/.github/workflows/crowdin-download.yml
@@ -14,7 +14,7 @@ jobs:
 
     steps:
       - name: Checkout
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
 
       - 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 8bc9f5193..705af12c0 100644
--- a/.github/workflows/crowdin-upload.yml
+++ b/.github/workflows/crowdin-upload.yml
@@ -20,7 +20,7 @@ jobs:
 
     steps:
       - name: Checkout
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
 
       - name: crowdin action
         uses: crowdin/github-action@v1
diff --git a/.github/workflows/lint-css.yml b/.github/workflows/lint-css.yml
index 4d3c2ce5a..bd775dba2 100644
--- a/.github/workflows/lint-css.yml
+++ b/.github/workflows/lint-css.yml
@@ -33,7 +33,7 @@ jobs:
 
     steps:
       - name: Clone repository
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
 
       - name: Set up Node.js
         uses: actions/setup-node@v3
diff --git a/.github/workflows/lint-haml.yml b/.github/workflows/lint-haml.yml
index 56d817123..ca9bd66a4 100644
--- a/.github/workflows/lint-haml.yml
+++ b/.github/workflows/lint-haml.yml
@@ -28,7 +28,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Clone repository
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
 
       - name: Install native Ruby dependencies
         run: |
diff --git a/.github/workflows/lint-js.yml b/.github/workflows/lint-js.yml
index 1f0cfd1e7..67d28589c 100644
--- a/.github/workflows/lint-js.yml
+++ b/.github/workflows/lint-js.yml
@@ -37,7 +37,7 @@ jobs:
 
     steps:
       - name: Clone repository
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
 
       - name: Set up Node.js
         uses: actions/setup-node@v3
diff --git a/.github/workflows/lint-json.yml b/.github/workflows/lint-json.yml
index 8712d8bd8..1d98c5267 100644
--- a/.github/workflows/lint-json.yml
+++ b/.github/workflows/lint-json.yml
@@ -29,7 +29,7 @@ jobs:
 
     steps:
       - name: Clone repository
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
 
       - name: Set up Node.js
         uses: actions/setup-node@v3
diff --git a/.github/workflows/lint-md.yml b/.github/workflows/lint-md.yml
index d19a0470d..1b3f92c97 100644
--- a/.github/workflows/lint-md.yml
+++ b/.github/workflows/lint-md.yml
@@ -29,7 +29,7 @@ jobs:
 
     steps:
       - name: Clone repository
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
 
       - name: Set up Node.js
         uses: actions/setup-node@v3
diff --git a/.github/workflows/lint-ruby.yml b/.github/workflows/lint-ruby.yml
index c898b2632..92882a084 100644
--- a/.github/workflows/lint-ruby.yml
+++ b/.github/workflows/lint-ruby.yml
@@ -29,7 +29,7 @@ jobs:
 
     steps:
       - name: Clone repository
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
 
       - name: Install native Ruby dependencies
         run: sudo apt-get install -y libicu-dev libidn11-dev
diff --git a/.github/workflows/lint-yml.yml b/.github/workflows/lint-yml.yml
index 295e9610b..e77cc9889 100644
--- a/.github/workflows/lint-yml.yml
+++ b/.github/workflows/lint-yml.yml
@@ -31,7 +31,7 @@ jobs:
 
     steps:
       - name: Clone repository
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
 
       - name: Set up Node.js
         uses: actions/setup-node@v3
diff --git a/.github/workflows/test-js.yml b/.github/workflows/test-js.yml
index 3306105f9..0ef1d9b7c 100644
--- a/.github/workflows/test-js.yml
+++ b/.github/workflows/test-js.yml
@@ -33,7 +33,7 @@ jobs:
 
     steps:
       - name: Clone repository
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
 
       - name: Set up Node.js
         uses: actions/setup-node@v3
diff --git a/.github/workflows/test-migrations-one-step.yml b/.github/workflows/test-migrations-one-step.yml
index a91fd819a..59287e88c 100644
--- a/.github/workflows/test-migrations-one-step.yml
+++ b/.github/workflows/test-migrations-one-step.yml
@@ -70,7 +70,7 @@ jobs:
       BUNDLE_RETRY: 3
 
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
 
       - name: Install native Ruby dependencies
         run: |
diff --git a/.github/workflows/test-migrations-two-step.yml b/.github/workflows/test-migrations-two-step.yml
index 50266fb8a..8f3c84d8f 100644
--- a/.github/workflows/test-migrations-two-step.yml
+++ b/.github/workflows/test-migrations-two-step.yml
@@ -69,7 +69,7 @@ jobs:
       BUNDLE_RETRY: 3
 
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
 
       - name: Install native Ruby dependencies
         run: |
diff --git a/.github/workflows/test-ruby.yml b/.github/workflows/test-ruby.yml
index 9439e003e..343dc36ca 100644
--- a/.github/workflows/test-ruby.yml
+++ b/.github/workflows/test-ruby.yml
@@ -32,7 +32,7 @@ jobs:
       SECRET_KEY_BASE: precompile_placeholder
 
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
 
       - name: Set up Node.js
         uses: actions/setup-node@v3
@@ -127,7 +127,7 @@ jobs:
           - 3
           - 4
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
 
       - uses: actions/download-artifact@v3
         with:
@@ -202,7 +202,7 @@ jobs:
           - '.ruby-version'
 
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
 
       - uses: actions/download-artifact@v3
         with:
@@ -315,7 +315,7 @@ jobs:
           - '.ruby-version'
 
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
 
       - uses: actions/download-artifact@v3
         with: