diff --git a/ESXi/Packer/ubuntu1804_esxi.json b/ESXi/Packer/ubuntu1804_esxi.json
index 39eadb3..a6b6747 100644
--- a/ESXi/Packer/ubuntu1804_esxi.json
+++ b/ESXi/Packer/ubuntu1804_esxi.json
@@ -39,7 +39,6 @@
             "guest_os_type": "ubuntu-64",
             "http_directory": "{{user `http_directory`}}",
             "iso_checksum": "{{user `iso_checksum`}}",
-            "iso_checksum_type": "{{user `iso_checksum_type`}}",
             "iso_url": "{{user `mirror`}}/{{user `mirror_directory`}}/{{user `iso_name`}}",
             "shutdown_command": "echo 'vagrant' | sudo -S shutdown -P now",
             "ssh_password": "vagrant",
@@ -91,8 +90,7 @@
         "esxi_password": "",
         "headless": "false",
         "guest_additions_url": "",
-        "iso_checksum": "e2ecdace33c939527cbc9e8d23576381c493b071107207d2040af72595f8990b",
-        "iso_checksum_type": "sha256",
+        "iso_checksum": "sha256:e2ecdace33c939527cbc9e8d23576381c493b071107207d2040af72595f8990b",
         "iso_name": "ubuntu-18.04.4-server-amd64.iso",
         "memory": "4096",
         "mirror": "http://cdimage.ubuntu.com",
diff --git a/ESXi/Packer/windows_10_esxi.json b/ESXi/Packer/windows_10_esxi.json
index f66b0b0..5b6964e 100644
--- a/ESXi/Packer/windows_10_esxi.json
+++ b/ESXi/Packer/windows_10_esxi.json
@@ -12,7 +12,6 @@
       "vm_name":"Windows10",
       "communicator": "winrm",
       "iso_url": "{{user `iso_url`}}",
-      "iso_checksum_type": "{{user `iso_checksum_type`}}",
       "iso_checksum": "{{user `iso_checksum`}}",
       "headless": false,
       "boot_wait": "6m",
diff --git a/ESXi/Packer/windows_2016_esxi.json b/ESXi/Packer/windows_2016_esxi.json
index aff934b..9242bfa 100644
--- a/ESXi/Packer/windows_2016_esxi.json
+++ b/ESXi/Packer/windows_2016_esxi.json
@@ -12,7 +12,6 @@
       "type": "vmware-iso",
       "communicator": "winrm",
       "iso_url": "{{user `iso_url`}}",
-      "iso_checksum_type": "{{user `iso_checksum_type`}}",
       "iso_checksum": "{{user `iso_checksum`}}",
       "headless": false,
       "boot_wait": "2m",
diff --git a/Packer/windows_10.json b/Packer/windows_10.json
index 300bc51..19ebee2 100644
--- a/Packer/windows_10.json
+++ b/Packer/windows_10.json
@@ -5,7 +5,6 @@
       "vm_name": "windows_10",
       "communicator": "winrm",
       "iso_url": "{{user `iso_url`}}",
-      "iso_checksum_type": "{{user `iso_checksum_type`}}",
       "iso_checksum": "{{user `iso_checksum`}}",
       "headless": false,
       "boot_wait": "6m",
@@ -47,7 +46,6 @@
       "vm_name": "windows_10",
       "communicator": "winrm",
       "iso_url": "{{user `iso_url`}}",
-      "iso_checksum_type": "{{user `iso_checksum_type`}}",
       "iso_checksum": "{{user `iso_checksum`}}",
       "headless": false,
       "boot_wait": "6m",
@@ -94,7 +92,6 @@
       "vm_name": "windows_10",
       "communicator": "winrm",
       "iso_url": "{{user `iso_url`}}",
-      "iso_checksum_type": "{{user `iso_checksum_type`}}",
       "iso_checksum": "{{user `iso_checksum`}}",
       "headless": false,
       "boot_wait": "6m",
diff --git a/Packer/windows_2016.json b/Packer/windows_2016.json
index c7bd981..c4910db 100644
--- a/Packer/windows_2016.json
+++ b/Packer/windows_2016.json
@@ -5,7 +5,6 @@
       "type": "vmware-iso",
       "communicator": "winrm",
       "iso_url": "{{user `iso_url`}}",
-      "iso_checksum_type": "{{user `iso_checksum_type`}}",
       "iso_checksum": "{{user `iso_checksum`}}",
       "headless": false,
       "boot_wait": "2m",
@@ -44,7 +43,6 @@
       "type": "virtualbox-iso",
       "communicator": "winrm",
       "iso_url": "{{user `iso_url`}}",
-      "iso_checksum_type": "{{user `iso_checksum_type`}}",
       "iso_checksum": "{{user `iso_checksum`}}",
       "headless": false,
       "boot_wait": "2m",
@@ -88,7 +86,6 @@
       "vm_name": "windows_10",
       "communicator": "winrm",
       "iso_url": "{{user `iso_url`}}",
-      "iso_checksum_type": "{{user `iso_checksum_type`}}",
       "iso_checksum": "{{user `iso_checksum`}}",
       "headless": false,
       "boot_wait": "6m",