diff --git a/lib/json-parser.js b/lib/json-parser.js
index fae0f14..921b564 100644
--- a/lib/json-parser.js
+++ b/lib/json-parser.js
@@ -26,6 +26,10 @@ function deepPrepare(ast) {
         case 'ArrayExpression':
             ast.elements.forEach(deepPrepare);
             break;
+        
+        case 'UnaryExpression':
+            deepPrepare(ast.argument);
+            break;
 
         case 'Literal':
             break;
diff --git a/package.json b/package.json
index f282cce..78a3029 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "json-file-pointer",
-  "version": "0.0.2",
+  "version": "0.0.3",
   "description": "Returns line/column location of path on json",
   "main": "index.js",
   "scripts": {
@@ -24,7 +24,7 @@
   },
   "homepage": "https://github.com/Vittly/json-file-pointer#readme",
   "dependencies": {
-    "acorn": "^4.0.3"
+    "acorn": "^8.4.1",
   },
   "devDependencies": {
     "chai": "^3.5.0",