diff --git a/.github/workflows/versioning.yml b/.github/workflows/versioning.yml
index bf138c43..8335624c 100644
--- a/.github/workflows/versioning.yml
+++ b/.github/workflows/versioning.yml
@@ -19,7 +19,7 @@ jobs:
     timeout-minutes: 90
     steps:
       - name: Run ci-versioning
-        uses: BuroHappoldEngineeringAdmin/CI_Toolkit/.github/actions/ci-versioning@develop
+        uses: BuroHappoldEngineeringAdmin/CI_Toolkit/.github/actions/ci-versioning@fix/ci-versioning-gate-and-scan-root
         with:
           app_id: ${{ secrets.BHOM_APP_ID }}
           private_key: ${{ secrets.BHOM_APP_PRIVATE_KEY }}
diff --git a/File_Engine/Compute/NewFilenameIfExists.cs b/File_Engine/Compute/NewFilenameIfExists.cs
index d5000f25..befca9a8 100644
--- a/File_Engine/Compute/NewFilenameIfExists.cs
+++ b/File_Engine/Compute/NewFilenameIfExists.cs
@@ -64,6 +64,7 @@ public static string NewFilenameIfExists(string targetPath)
             }
             while (System.IO.File.Exists(targetPath));
 
+            // Sandbox validation touch: gives the versioning gate a .cs change to match.
             return targetPath;
         }
     }
diff --git a/File_Engine/Versioning_93.json b/File_Engine/Versioning_93.json
new file mode 100644
index 00000000..154665e2
--- /dev/null
+++ b/File_Engine/Versioning_93.json
@@ -0,0 +1,5 @@
+{
+  "MessageForNoUpgrade": {
+    "BH.Engine.Adapters.File.Query.SandboxScanRootProbe": "Sandbox validation entry for CI_Toolkit fix/ci-versioning-gate-and-scan-root. Proves the upgrade scan reaches a Versioning_NN.json committed in the calling repo. Not a real deprecation."
+  }
+}