diff --git a/.github/workflows/codeql.yml b/.github/workflows/codeql.yml
index facad93..5db5a38 100644
--- a/.github/workflows/codeql.yml
+++ b/.github/workflows/codeql.yml
@@ -20,7 +20,7 @@ jobs:
 
     steps:
       - name: Checkout repository
-        uses: actions/checkout@v6
+        uses: actions/checkout@v7
 
       - name: Setup .NET
         uses: actions/setup-dotnet@v5
diff --git a/.github/workflows/core-release.yml b/.github/workflows/core-release.yml
index 81f87c6..cdbf872 100644
--- a/.github/workflows/core-release.yml
+++ b/.github/workflows/core-release.yml
@@ -49,7 +49,7 @@ jobs:
       contents: read
     steps:
       - name: Checkout
-        uses: actions/checkout@v6
+        uses: actions/checkout@v7
 
       - name: Setup .NET
         uses: actions/setup-dotnet@v5
diff --git a/.github/workflows/dotnet.yml b/.github/workflows/dotnet.yml
index 48cc1d2..f39a554 100644
--- a/.github/workflows/dotnet.yml
+++ b/.github/workflows/dotnet.yml
@@ -18,7 +18,7 @@ jobs:
     runs-on: ubuntu-latest
 
     steps:
-    - uses: actions/checkout@v6
+    - uses: actions/checkout@v7
     - name: Setup .NET
       uses: actions/setup-dotnet@v5
       with:
diff --git a/.github/workflows/mass-release.yml b/.github/workflows/mass-release.yml
index 9d7e177..0f0e8bf 100644
--- a/.github/workflows/mass-release.yml
+++ b/.github/workflows/mass-release.yml
@@ -62,7 +62,7 @@ jobs:
           echo "Confirm input OK."
 
       - name: Checkout
-        uses: actions/checkout@v6
+        uses: actions/checkout@v7
         with:
           fetch-depth: 0
 
diff --git a/.github/workflows/mcp-ci.yml b/.github/workflows/mcp-ci.yml
index c31a545..502b683 100644
--- a/.github/workflows/mcp-ci.yml
+++ b/.github/workflows/mcp-ci.yml
@@ -24,7 +24,7 @@ jobs:
     runs-on: ubuntu-latest
 
     steps:
-      - uses: actions/checkout@v6
+      - uses: actions/checkout@v7
 
       - name: Setup .NET
         uses: actions/setup-dotnet@v5
diff --git a/.github/workflows/mcp-release.yml b/.github/workflows/mcp-release.yml
index a6d4059..81aad28 100644
--- a/.github/workflows/mcp-release.yml
+++ b/.github/workflows/mcp-release.yml
@@ -25,7 +25,7 @@ jobs:
 
     steps:
       - name: Checkout
-        uses: actions/checkout@v6
+        uses: actions/checkout@v7
 
       - name: Setup .NET
         uses: actions/setup-dotnet@v5
diff --git a/.github/workflows/release.yml b/.github/workflows/release.yml
index 6d15473..d833cee 100644
--- a/.github/workflows/release.yml
+++ b/.github/workflows/release.yml
@@ -44,7 +44,7 @@ jobs:
 
     steps:
       - name: Checkout
-        uses: actions/checkout@v6
+        uses: actions/checkout@v7
         with:
           # Full history so the master-ancestry gate can resolve merge-base.
           fetch-depth: 0