diff --git a/CHANGELOG.md b/CHANGELOG.md
index 53a8f52..8ccb8ff 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -23,6 +23,7 @@ The format is based on and uses the types of changes according to [Keep a Change
 - Updates the `Invoke-M365SecurityAudit` script to temporarily disable PnP PowerShell update checks during execution and restores the original setting afterward.
 - Pre-Test cmdlet call to `Get-MgGroup` to load the MgGraph assembly prior to running PnP PowerShell commands when using app authentication.
 - Output Verbosity for test score.
+- Get-TestDefinition private function for v4.0.0 to get the test definition for the test.
 
 ### Fixed
 
diff --git a/source/Private/Get-TestDefinition.ps1 b/source/Private/Get-TestDefinition.ps1
new file mode 100644
index 0000000..39a70f4
--- /dev/null
+++ b/source/Private/Get-TestDefinition.ps1
@@ -0,0 +1,28 @@
+function Get-TestDefinition {
+    param (
+        [string]$Version
+    )
+    # Load test definitions from CSV
+    $testDefinitionsPath = Join-Path -Path $PSScriptRoot -ChildPath 'helper\TestDefinitions.csv'
+    $testDefinitions = Import-Csv -Path $testDefinitionsPath
+    # ################ Check for $Version -eq '4.0.0' ################
+    if ($Version -eq '4.0.0') {
+        $script:Version400 = $true
+        $testDefinitionsV4Path = Join-Path -Path $PSScriptRoot -ChildPath 'helper\TestDefinitions-v4.0.0.csv'
+        $testDefinitionsV4 = Import-Csv -Path $testDefinitionsV4Path
+        # Merge the definitions, prioritizing version 4.0.0
+        $mergedDefinitions = @{ }
+        foreach ($test in $testDefinitions) {
+            $mergedDefinitions[$test.Rec] = $test
+        }
+        foreach ($testV4 in $testDefinitionsV4) {
+            $mergedDefinitions[$testV4.Rec] = $testV4  # Overwrite if Rec exists
+        }
+        # Convert back to an array
+        $testDefinitions = $mergedDefinitions.Values
+        Write-Verbose "Total tests after merging: $(($testDefinitions).Count)"
+        $overwrittenTests = $testDefinitionsV4 | Where-Object { $testDefinitions[$_.Rec] }
+        Write-Verbose "Overwritten tests: $($overwrittenTests.Rec -join ', ')"
+    }
+    return $testDefinitions
+}