diff --git a/.changeset/dull-spiders-walk.md b/.changeset/dull-spiders-walk.md
new file mode 100644
index 00000000..ba397186
--- /dev/null
+++ b/.changeset/dull-spiders-walk.md
@@ -0,0 +1,5 @@
+---
+'thebe-core': patch
+---
+
+Adding explicit rendermime factor for handling errors, follow an upstream change in lab 4.3
diff --git a/packages/core/src/rendermime.ts b/packages/core/src/rendermime.ts
index 21a1cfee..fdd7d106 100644
--- a/packages/core/src/rendermime.ts
+++ b/packages/core/src/rendermime.ts
@@ -7,6 +7,7 @@ import {
   svgRendererFactory,
   imageRendererFactory,
   textRendererFactory,
+  errorRendererFactory,
 } from '@jupyterlab/rendermime';
 import type { MathjaxOptions } from './types';
 import { MathJaxTypesetter } from '@jupyterlab/mathjax2';
@@ -22,6 +23,7 @@ const EXTENDED_FACTORIES = [
   imageRendererFactory,
   javascriptRendererFactory,
   textRendererFactory,
+  errorRendererFactory,
 ];
 
 let RENDERERS: IRenderMime.IRendererFactory[] | null = null;