diff --git a/node_modules/jsdoc/lib/jsdoc/util/dumper.js b/node_modules/jsdoc/lib/jsdoc/util/dumper.js
index 515c972..975757b 100644
--- a/node_modules/jsdoc/lib/jsdoc/util/dumper.js
+++ b/node_modules/jsdoc/lib/jsdoc/util/dumper.js
@@ -95,13 +95,13 @@ class ObjectWalker {
                 return newArray;
             });
         }
-        else if ( util.isRegExp(o) ) {
+        else if ( util.types.isRegExp(o) ) {
             result = `<RegExp ${o}>`;
         }
-        else if ( util.isDate(o) ) {
+        else if ( util.types.isDate(o) ) {
             result = `<Date ${o.toUTCString()}>`;
         }
-        else if ( util.isError(o) ) {
+        else if ( Object.prototype.toString.call(o) === '[object Error]' ) {
             result = { message: o.message };
         }
         else if ( this.isFunction(o) ) {