diff --git a/scripts/install-cumulative-update.ps1 b/scripts/install-cumulative-update.ps1
new file mode 100644
index 00000000..0dc92a99
--- /dev/null
+++ b/scripts/install-cumulative-update.ps1
@@ -0,0 +1,42 @@
+$ErrorActionPreference = 'Stop'
+
+$Session = New-Object -ComObject 'Microsoft.Update.Session'
+$Session.ClientApplicationID = 'Packer Windows Update Installer'
+$UpdateSearcher = $Session.CreateUpdateSearcher()
+Write-Output "Searching for Windows updates ..."
+$SearchResult = $UpdateSearcher.Search("IsInstalled=0 and Type='Software' and IsHidden=0")
+$Updates = $SearchResult.Updates
+$UpdatesToDownload = New-Object -ComObject 'Microsoft.Update.UpdateColl'
+
+if ($Updates.Count -gt 0) {
+  $i = $Updates.Count - 1
+  while ($i -ge 0) {
+    $Update = $Updates.Item($i)
+    if ($Update.Title -match "Cumulative Update") {
+      Write-Output "Found $($Update.Title)"
+      if (!($Update.EulaAccepted)) {
+        $Update.AcceptEula()
+      }
+      $UpdatesToDownload.Add($Update) | Out-Null
+      break
+    }
+    $i--
+  }
+}
+
+if ($UpdatesToDownload.Count -eq 0) {
+  Write-Output "No cumulative Windows updates found."
+} else {
+  Write-Output "Downloading cumulative Windows update ..."
+  $Downloader = $Session.CreateUpdateDownloader()
+  $Downloader.Updates = $UpdatesToDownload
+  $Downloader.Download()
+
+  Write-Output "Installing Windows update ..."
+  $Installer = $Session.CreateUpdateInstaller()
+  $Installer.Updates = $UpdatesToDownload
+  $InstallationResult = $Installer.Install()
+
+  Write-Output "Installation Result: $($InstallationResult.ResultCode)"
+  Write-Output "Reboot Required: $($InstallationResult.RebootRequired)"
+}
diff --git a/scripts/vm-guest-tools.bat b/scripts/vm-guest-tools.bat
index fc0bb5e5..6cb51c81 100644
--- a/scripts/vm-guest-tools.bat
+++ b/scripts/vm-guest-tools.bat
@@ -19,7 +19,7 @@ if exist "C:\Users\vagrant\windows.iso" (
 )
 
 if not exist "C:\Windows\Temp\windows.iso" (
-    powershell -Command "(New-Object System.Net.WebClient).DownloadFile('https://softwareupdate.vmware.com/cds/vmw-desktop/ws/15.5.0/14665864/windows/packages/tools-windows.tar', 'C:\Windows\Temp\vmware-tools.tar')" <NUL
+    powershell -Command "(New-Object System.Net.WebClient).DownloadFile('https://softwareupdate.vmware.com/cds/vmw-desktop/ws/15.5.1/15018445/windows/packages/tools-windows.tar', 'C:\Windows\Temp\vmware-tools.tar')" <NUL
     cmd /c ""C:\Program Files\7-Zip\7z.exe" x C:\Windows\Temp\vmware-tools.tar -oC:\Windows\Temp"
     FOR /r "C:\Windows\Temp" %%a in (VMware-tools-windows-*.iso) DO REN "%%~a" "windows.iso"
     rd /S /Q "C:\Program Files (x86)\VMWare"
@@ -40,7 +40,7 @@ if exist "C:\Users\vagrant\VBoxGuestAdditions.iso" (
 )
 
 if not exist "C:\Windows\Temp\VBoxGuestAdditions.iso" (
-    powershell -Command "[Net.ServicePointManager]::SecurityProtocol = [Net.SecurityProtocolType]::Tls12; (New-Object System.Net.WebClient).DownloadFile('https://download.virtualbox.org/virtualbox/6.0.10/VBoxGuestAdditions_6.0.10.iso', 'C:\Windows\Temp\VBoxGuestAdditions.iso')" <NUL
+    powershell -Command "[Net.ServicePointManager]::SecurityProtocol = [Net.SecurityProtocolType]::Tls12; (New-Object System.Net.WebClient).DownloadFile('https://download.virtualbox.org/virtualbox/6.1.2/VBoxGuestAdditions_6.1.2.iso', 'C:\Windows\Temp\VBoxGuestAdditions.iso')" <NUL
 )
 
 cmd /c ""C:\Program Files\7-Zip\7z.exe" x C:\Windows\Temp\VBoxGuestAdditions.iso -oC:\Windows\Temp\virtualbox"