diff --git a/.github/workflows/aca-deploy.yml b/.github/workflows/aca-deploy.yml
index 71fb825..a6d22d8 100644
--- a/.github/workflows/aca-deploy.yml
+++ b/.github/workflows/aca-deploy.yml
@@ -21,7 +21,7 @@ jobs:
 
     steps:
       - name: Checkout
-        uses: actions/checkout@v4
+        uses: actions/checkout@v6
 
       - name: Lowercase owner
         id: lc
diff --git a/.github/workflows/ci-tests.yml b/.github/workflows/ci-tests.yml
index efa59fc..0656ba3 100644
--- a/.github/workflows/ci-tests.yml
+++ b/.github/workflows/ci-tests.yml
@@ -16,7 +16,7 @@ jobs:
 
     steps:
       - name: Checkout
-        uses: actions/checkout@v4
+        uses: actions/checkout@v6
 
       - name: Setup .NET
         uses: actions/setup-dotnet@v4
diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 3318f6c..ddb6b28 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -21,7 +21,7 @@ jobs:
 
     steps:
       - name: Checkout
-        uses: actions/checkout@v4
+        uses: actions/checkout@v6
 
       - name: Setup .NET
         uses: actions/setup-dotnet@v4
@@ -111,7 +111,7 @@ jobs:
       run:
         working-directory: src/StockSim.React
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
       - uses: actions/setup-node@v4
         with:
           node-version: "20"
@@ -129,7 +129,7 @@ jobs:
       (github.event_name == 'pull_request' && github.event.pull_request.base.ref == 'master')
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
 
       - name: Set up Docker Buildx
         uses: docker/setup-buildx-action@v3
diff --git a/.github/workflows/codeql.yml b/.github/workflows/codeql.yml
index 1446b2d..c1d626c 100644
--- a/.github/workflows/codeql.yml
+++ b/.github/workflows/codeql.yml
@@ -20,7 +20,7 @@ jobs:
         language: [ 'csharp', 'javascript-typescript' ]
     steps:
       - name: Checkout
-        uses: actions/checkout@v4
+        uses: actions/checkout@v6
 
       - name: Initialize CodeQL
         uses: github/codeql-action/init@v3
diff --git a/.github/workflows/docker-build.yml b/.github/workflows/docker-build.yml
index 923f146..743420a 100644
--- a/.github/workflows/docker-build.yml
+++ b/.github/workflows/docker-build.yml
@@ -20,7 +20,7 @@ jobs:
 
     steps:
       - name: Checkout
-        uses: actions/checkout@v4
+        uses: actions/checkout@v6
 
       - name: Lowercase owner for GHCR
         id: lc
diff --git a/.github/workflows/release.yml b/.github/workflows/release.yml
index e6d4c1f..7e77757 100644
--- a/.github/workflows/release.yml
+++ b/.github/workflows/release.yml
@@ -25,7 +25,7 @@ jobs:
 
     steps:
       - name: Checkout
-        uses: actions/checkout@v4
+        uses: actions/checkout@v6
 
       - name: Determine version
         id: ver