diff --git a/build/build.ps1 b/build/build.ps1
index c2c5bdd232..15d455b976 100644
--- a/build/build.ps1
+++ b/build/build.ps1
@@ -125,7 +125,23 @@
         $error.Clear()
 
         Write-Output "### gulp build for version $($this.Version.Release)" >> $log 2>&1
-        npx gulp build --buildversion=$this.Version.Release >> $log 2>&1
+        npm run build --buildversion=$this.Version.Release >> $log 2>&1
+		
+		# We can ignore this warning, we need to update to node 12 at some point - https://github.com/jsdom/jsdom/issues/2939
+		$indexes = [System.Collections.ArrayList]::new()
+		$index = 0;
+		$error | ForEach-Object {
+			# Find which of the errors is the ExperimentalWarning
+			if($_.ToString().Contains("ExperimentalWarning: The fs.promises API is experimental")) {
+				[void]$indexes.Add($index)
+			}
+			$index++
+		}
+		$indexes | ForEach-Object {
+			# Loop through the list of indexes and remove the errors that we expect and feel confident we can ignore
+			$error.Remove($error[$_])
+		}
+		
         if (-not $?) { throw "Failed to build" } # that one is expected to work
     } finally {
         Pop-Location
diff --git a/src/Umbraco.Web.UI.Client/package.json b/src/Umbraco.Web.UI.Client/package.json
index fa94bf79f6..e0afe1c2a7 100644
--- a/src/Umbraco.Web.UI.Client/package.json
+++ b/src/Umbraco.Web.UI.Client/package.json
@@ -72,11 +72,11 @@
     "gulp-wrap": "0.15.0",
     "gulp-wrap-js": "0.4.1",
     "jasmine-core": "3.5.0",
+    "jsdom": "16.4.0",
     "karma": "4.4.1",
-    "karma-chrome-launcher": "^3.1.0",
+    "karma-jsdom-launcher": "^8.0.2",
     "karma-jasmine": "2.0.1",
     "karma-junit-reporter": "2.0.1",
-    "karma-phantomjs-launcher": "1.0.4",
     "karma-spec-reporter": "0.0.32",
     "less": "3.10.3",
     "lodash": "4.17.19",
diff --git a/src/Umbraco.Web.UI.Client/test/config/karma.conf.js b/src/Umbraco.Web.UI.Client/test/config/karma.conf.js
index d0f59c110f..c039e59ee1 100644
--- a/src/Umbraco.Web.UI.Client/test/config/karma.conf.js
+++ b/src/Umbraco.Web.UI.Client/test/config/karma.conf.js
@@ -100,14 +100,7 @@ module.exports = function (config) {
         // - PhantomJS
         // - IE (only Windows)
         // CLI --browsers Chrome,Firefox,Safari
-        browsers: ['ChromeHeadless'],
-
-        customLaunchers: {
-            ChromeDebugging: {
-                base: 'Chrome',
-                flags: ['--remote-debugging-port=9333']
-            }
-        },
+        browsers: ['jsdom'],
 
         // allow waiting a bit longer, some machines require this
 
@@ -123,11 +116,9 @@ module.exports = function (config) {
 
         plugins: [
             require('karma-jasmine'),
-            require('karma-phantomjs-launcher'),
-            require('karma-chrome-launcher'),
+            require('karma-jsdom-launcher'),
             require('karma-junit-reporter'),
             require('karma-spec-reporter')
-
         ],
 
         // the default configuration