diff --git a/neuron_en.html b/neuron_en.html
index c807976..45100d4 100644
--- a/neuron_en.html
+++ b/neuron_en.html
@@ -100,8 +100,7 @@
     '../sherpa/lib/seedrandom-2.4.2.js',
     '../sherpa/lib/base64-js-1.2.0.js',
     '../sherpa/lib/TextEncoderLite-3c9f6f0.js',
-    '../tandem/js/PhetioIDUtils.js',
-    '../perennial-alias/js/common/SimVersion.js'
+    '../tandem/js/PhetioIDUtils.js'
   ];
 
   if ( brand === 'phet-io' ) {