diff --git a/assets/style.sass b/assets/style.sass
index 9efe285..d9ec750 100644
--- a/assets/style.sass
+++ b/assets/style.sass
@@ -100,8 +100,10 @@ section
 .skill-level
   th
     font-weight: $semibold-weight
-    padding-right: 2 * $grid-height
+    padding-right: $grid-height
     text-align: left
+    width: 6.4pc;
+    vertical-align: top;
 
 .block
   page-break-inside: avoid
diff --git a/data/schema-ext.json b/data/schema-ext.json
new file mode 100644
index 0000000..55dbcc4
--- /dev/null
+++ b/data/schema-ext.json
@@ -0,0 +1,19 @@
+{
+  "$schema": "http://json-schema.org/draft-04/schema#",
+  "title": "Resume Schema Extension for Test Double",
+  "type": "object",
+  "properties": {
+    "skills": {
+      "type": "array",
+      "items": {
+        "type": "object",
+        "properties": {
+          "level": {
+            "type": "string",
+            "enum": ["Teaching others", "Pairing on", "Excited about"]
+          }
+        }
+      }
+    }
+  }
+}
diff --git a/lib/cobbler.js b/lib/cobbler.js
index 262e845..37b3381 100644
--- a/lib/cobbler.js
+++ b/lib/cobbler.js
@@ -1,6 +1,6 @@
 var debug = require('debug')
 var fs = require('fs')
-var CSON = require('cson')
+var CSON = require('cson-parser')
 var hummus = require('hummus')
 var jade = require('pug')
 var marked = require('marked')
@@ -9,8 +9,9 @@ var nightmare = require('nightmare')
 var path = require('path')
 var traverse = require('traverse')
 var url = require('url')
-var validator = require('z-schema')
+var validateAgainstSchema = require('./validate-against-schema')
 var RESUME_SCHEMA = require('resume-schema/schema.json')
+var RESUME_SCHEMA_EXT = require('../data/schema-ext.json')
 
 module.exports = {
   //
@@ -35,8 +36,10 @@ module.exports = {
         }
       })
       .then(data => {
-        return validator.validate(data, RESUME_SCHEMA)
-          .then(_ => data)
+        return validateAgainstSchema(RESUME_SCHEMA, data)
+      })
+      .then(data => {
+        return validateAgainstSchema(RESUME_SCHEMA_EXT, data)
       })
       .then(data => {
         debug('cobbler:load')('Data: %j', data)
@@ -46,7 +49,7 @@ module.exports = {
         if (err.errors) {
           throw new Error([err.message].concat(
             err.errors.map(validationError => {
-              return validationError.path + ': ' + validationError.message
+              return validationError.dataPath + ': ' + validationError.message
             })
           ).join('\n'))
         }
diff --git a/lib/validate-against-schema.js b/lib/validate-against-schema.js
new file mode 100644
index 0000000..36e7712
--- /dev/null
+++ b/lib/validate-against-schema.js
@@ -0,0 +1,24 @@
+var Ajv = require('ajv')
+
+// See https://github.com/epoberezkin/ajv#using-version-6 for an explanation
+// of these settings, which are required because JSONResume uses draft-04.
+var ajv = new Ajv({
+  allErrors: true,
+  schemaId: 'id'
+})
+ajv.addMetaSchema(require('ajv/lib/refs/json-schema-draft-04.json'))
+
+function validateAgainstSchema(schema, data) {
+  return Promise.resolve(ajv.validate(schema, data))
+    .then(function (valid) {
+      if (!valid) {
+        var error = new Error('Validation failed')
+        error.errors = ajv.errors
+        throw error
+      }
+
+      return data
+    })
+}
+
+module.exports = validateAgainstSchema
diff --git a/package.json b/package.json
index fd06a63..9001d60 100644
--- a/package.json
+++ b/package.json
@@ -13,14 +13,15 @@
   "author": "Michael Schoonmaker <michael.r.schoonmaker@gmail.com> (https://www.schoonology.com/)",
   "license": "MIT",
   "dependencies": {
-    "cson": "^4.0.0",
-    "debug": "~2.3.3",
+    "ajv": "~6.2.1",
+    "cson-parser": "~3.0.0",
+    "debug": "~3.1.0",
     "hummus": "~1.0.65",
-    "jstransformer-sass": "~0.1.0",
+    "jstransformer-sass": "~1.0.0",
     "marked": "~0.3.6",
     "minimist": "~1.2.0",
-    "moment": "~2.17.0",
-    "nightmare": "~2.8.1",
+    "moment": "~2.21.0",
+    "nightmare": "~3.0.0",
     "pug": "~2.0.0-beta6",
     "resume-schema": "0.0.16",
     "temp": "~0.8.3",