diff --git a/package-lock.json b/package-lock.json
index c71fe3e..fe91bd2 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -11,7 +11,7 @@
       "devDependencies": {
         "@11ty/eleventy": "^3.0.0",
         "@11ty/eleventy-plugin-vite": "^6.0.0-alpha.3",
-        "@bgotink/kdl": "^0.3.1",
+        "@bgotink/kdl": "^0.4.0",
         "@parcel/packager-raw-url": "^2.13.3",
         "@parcel/transformer-webmanifest": "^2.13.3",
         "@tailwindcss/typography": "^0.3.1",
@@ -339,9 +339,9 @@
       }
     },
     "node_modules/@bgotink/kdl": {
-      "version": "0.3.1",
-      "resolved": "https://registry.npmjs.org/@bgotink/kdl/-/kdl-0.3.1.tgz",
-      "integrity": "sha512-EQQpjS3RiYNlUymAeO06WUrphzSdmbXzQrJ4s8JAr0Ft5WE67s23i5JaulZ3BO0yHA4tMkUT2cHWEgAq5iJC8Q==",
+      "version": "0.4.0",
+      "resolved": "https://registry.npmjs.org/@bgotink/kdl/-/kdl-0.4.0.tgz",
+      "integrity": "sha512-F0uJCjo5FQvFdcGF5QbYVNfcGiRWlocuzyIdQxottZF2+gu6L2xjMGEu9PIpse2hifAca/19vIospgaETCKxIg==",
       "dev": true,
       "license": "MIT"
     },
diff --git a/package.json b/package.json
index 712c182..4f22d82 100644
--- a/package.json
+++ b/package.json
@@ -26,7 +26,7 @@
     "shiki": "^1.24.2",
     "svgo": "^3.3.2",
     "tailwindcss": "^2.0.2",
-    "@bgotink/kdl": "^0.3.1",
+    "@bgotink/kdl": "^0.4.0",
     "monaco-editor": "^0.52.0",
     "monaco-themes": "^0.4.4"
   },
diff --git a/static/play/play.js b/static/play/play.js
index dff190f..d8a598b 100644
--- a/static/play/play.js
+++ b/static/play/play.js
@@ -110,38 +110,18 @@ addEventListener("DOMContentLoaded", (event) => {
       document.nodes.forEach(node => {
         output.append(buildNodeTree(node))
       })
-
     } catch (error) {
       output.classList.add('error')
       if (error instanceof KDL.InvalidKdlError) {
-        markers.push({
-          message: error.message,
-          severity: monaco.MarkerSeverity.Error,
-          startLineNumber: error.start?.line,
-          startColumn: error.start?.column,
-          endLineNumber: error.end?.line,
-          endColumn: error.end?.column,
-        })
-      } else if (typeof AggregateError === 'function' && error instanceof AggregateError) {
-        for (const suberror of error.errors) {
-          if (suberror instanceof KDL.InvalidKdlError) {
-            markers.push({
-              message: suberror.message,
-              severity: monaco.MarkerSeverity.Error,
-              startLineNumber: suberror.start?.line,
-              startColumn: suberror.start?.column,
-              endLineNumber: suberror.end?.line,
-              endColumn: suberror.end?.column,
-            })
-          } else {
-            console.error(suberror);
-            markers.push({
-              message: "Failed to parse KDL",
-              severity: monaco.MarkerSeverity.Error,
-              startLineNumber: 1,
-              startColumn: 1,
-            })
-          }
+        for (const detail of error.flat()) {
+          markers.push({
+            message: detail.message,
+            severity: monaco.MarkerSeverity.Error,
+            startLineNumber: detail.start?.line,
+            startColumn: detail.start?.column,
+            endLineNumber: detail.end?.line,
+            endColumn: detail.end?.column,
+          })
         }
       } else {
         console.error(error)
@@ -159,4 +139,4 @@ addEventListener("DOMContentLoaded", (event) => {
   model.onDidChangeContent(parse)
 
   parse()
-})
\ No newline at end of file
+})