diff --git a/packer/templates/aws/ubuntu_1404_ctf_2017.json b/packer/templates/aws/ubuntu_1404_ctf_2017.json
index 8ea3adf..0c464e6 100644
--- a/packer/templates/aws/ubuntu_1404_ctf_2017.json
+++ b/packer/templates/aws/ubuntu_1404_ctf_2017.json
@@ -50,7 +50,6 @@
   ],
   "variables": {
     "iso_url": "http://old-releases.ubuntu.com/releases/14.04.1/ubuntu-14.04.1-server-amd64.iso",
-    "iso_checksum_type": "md5",
     "iso_checksum": "ca2531b8cd79ea5b778ede3a524779b9",
     "box_version": "0.1.18"
   }
diff --git a/packer/templates/pro/ubuntu_1404_pro.json b/packer/templates/pro/ubuntu_1404_pro.json
index 2cd42f4..ec238a3 100644
--- a/packer/templates/pro/ubuntu_1404_pro.json
+++ b/packer/templates/pro/ubuntu_1404_pro.json
@@ -3,7 +3,6 @@
     {
       "type": "vmware-iso",
       "iso_url": "{{user `iso_url`}}",
-      "iso_checksum_type": "{{user `iso_checksum_type`}}",
       "iso_checksum": "{{user `iso_checksum`}}",
       "headless": false,
       "http_directory" : "{{template_dir}}/../../http",
@@ -41,7 +40,6 @@
     {
       "type": "virtualbox-iso",
       "iso_url": "{{user `iso_url`}}",
-      "iso_checksum_type": "{{user `iso_checksum_type`}}",
       "iso_checksum": "{{user `iso_checksum`}}",
       "headless": false,
       "http_directory" : "{{template_dir}}/../../http",
@@ -104,7 +102,6 @@
   ],
   "variables": {
     "iso_url": "http://old-releases.ubuntu.com/releases/14.04.1/ubuntu-14.04.1-server-amd64.iso",
-    "iso_checksum_type": "md5",
     "iso_checksum": "ca2531b8cd79ea5b778ede3a524779b9",
     "box_version": "0.1.0"
   }
diff --git a/packer/templates/pro/windows_2008_r2_pro.json b/packer/templates/pro/windows_2008_r2_pro.json
index 6f86060..a440410 100644
--- a/packer/templates/pro/windows_2008_r2_pro.json
+++ b/packer/templates/pro/windows_2008_r2_pro.json
@@ -3,7 +3,6 @@
     {
       "type": "vmware-iso",
       "iso_url": "{{user `iso_url`}}",
-      "iso_checksum_type": "{{user `iso_checksum_type`}}",
       "iso_checksum": "{{user `iso_checksum`}}",
       "headless": false,
       "boot_wait": "10m",
@@ -47,7 +46,6 @@
     {
       "type": "virtualbox-iso",
       "iso_url": "{{user `iso_url`}}",
-      "iso_checksum_type": "{{user `iso_checksum_type`}}",
       "iso_checksum": "{{user `iso_checksum`}}",
       "headless": false,
       "boot_wait": "10m",
@@ -138,7 +136,6 @@
   ],
   "variables": {
     "iso_url": "http://download.microsoft.com/download/7/5/E/75EC4E54-5B02-42D6-8879-D8D3A25FBEF7/7601.17514.101119-1850_x64fre_server_eval_en-us-GRMSXEVAL_EN_DVD.iso",
-    "iso_checksum_type": "md5",
     "iso_checksum": "4263be2cf3c59177c45085c0a7bc6ca5",
     "autounattend": "{{template_dir}}/../../answer_files/2008_r2/Autounattend.xml",
     "scripts_dir": "{{template_dir}}/../../../scripts",
diff --git a/packer/templates/ubuntu_1404.json b/packer/templates/ubuntu_1404.json
index 31a56f0..b6c995b 100644
--- a/packer/templates/ubuntu_1404.json
+++ b/packer/templates/ubuntu_1404.json
@@ -3,7 +3,6 @@
     {
       "type": "parallels-iso",
       "iso_url": "{{user `iso_url`}}",
-      "iso_checksum_type": "{{user `iso_checksum_type`}}",
       "iso_checksum": "{{user `iso_checksum`}}",
       "http_directory" : "{{template_dir}}/../http",
       "http_port_min" : 9001,
@@ -36,7 +35,6 @@
     {
       "type": "vmware-iso",
       "iso_url": "{{user `iso_url`}}",
-      "iso_checksum_type": "{{user `iso_checksum_type`}}",
       "iso_checksum": "{{user `iso_checksum`}}",
       "headless": false,
       "http_directory" : "{{template_dir}}/../http",
@@ -74,7 +72,6 @@
     {
       "type": "virtualbox-iso",
       "iso_url": "{{user `iso_url`}}",
-      "iso_checksum_type": "{{user `iso_checksum_type`}}",
       "iso_checksum": "{{user `iso_checksum`}}",
       "headless": false,
       "http_directory" : "{{template_dir}}/../http",
@@ -119,7 +116,6 @@
     {
       "type": "qemu",
       "iso_url": "{{user `iso_url`}}",
-      "iso_checksum_type": "{{user `iso_checksum_type`}}",
       "iso_checksum": "{{user `iso_checksum`}}",
       "headless": false,
       "http_directory" : "{{template_dir}}/../http",
@@ -194,7 +190,6 @@
   ],
   "variables": {
     "iso_url": "http://old-releases.ubuntu.com/releases/14.04.0/ubuntu-14.04-server-amd64.iso",
-    "iso_checksum_type": "sha256",
     "iso_checksum": "ababb88a492e08759fddcf4f05e5ccc58ec9d47fa37550d63931d0a5fa4f7388",
     "box_version": "0.1.12"
   }
diff --git a/packer/templates/windows_2008_r2.json b/packer/templates/windows_2008_r2.json
index 072795c..f6d6bc2 100644
--- a/packer/templates/windows_2008_r2.json
+++ b/packer/templates/windows_2008_r2.json
@@ -3,7 +3,6 @@
     {
       "type": "parallels-iso",
       "iso_url": "{{user `iso_url`}}",
-      "iso_checksum_type": "{{user `iso_checksum_type`}}",
       "iso_checksum": "{{user `iso_checksum`}}",
       "boot_wait": "10m",
       "communicator": "ssh",
@@ -42,7 +41,6 @@
     {
       "type": "vmware-iso",
       "iso_url": "{{user `iso_url`}}",
-      "iso_checksum_type": "{{user `iso_checksum_type`}}",
       "iso_checksum": "{{user `iso_checksum`}}",
       "headless": false,
       "boot_wait": "10m",
@@ -85,7 +83,6 @@
     {
       "type": "virtualbox-iso",
       "iso_url": "{{user `iso_url`}}",
-      "iso_checksum_type": "{{user `iso_checksum_type`}}",
       "iso_checksum": "{{user `iso_checksum`}}",
       "headless": false,
       "boot_wait": "10m",
@@ -136,7 +133,6 @@
     {
       "type": "qemu",
       "iso_url": "{{user `iso_url`}}",
-      "iso_checksum_type": "{{user `iso_checksum_type`}}",
       "iso_checksum": "{{user `iso_checksum`}}",
       "headless": false,
       "boot_wait": "10m",
@@ -347,7 +343,6 @@
   ],
   "variables": {
     "iso_url": "http://download.microsoft.com/download/7/5/E/75EC4E54-5B02-42D6-8879-D8D3A25FBEF7/7601.17514.101119-1850_x64fre_server_eval_en-us-GRMSXEVAL_EN_DVD.iso",
-    "iso_checksum_type": "md5",
     "iso_checksum": "4263be2cf3c59177c45085c0a7bc6ca5",
     "autounattend": "{{template_dir}}/../answer_files/2008_r2/Autounattend.xml",
     "scripts_dir": "{{template_dir}}/../../scripts",