diff --git a/dev-docs/runtime-migration/spike/package.json b/dev-docs/runtime-migration/spike/package.json
index 01b02af6c0a..5e0a32f712c 100644
--- a/dev-docs/runtime-migration/spike/package.json
+++ b/dev-docs/runtime-migration/spike/package.json
@@ -39,7 +39,7 @@
     "pdfjs-dist": "4.9.155",
     "scss-parser": "1.0.6",
     "semver": "7.7.2",
-    "slimdom": "4.2.0",
+    "slimdom": "4.3.5",
     "std-legacy-encoding": "npm:@jsr/std__encoding@^0.224.0",
     "std-legacy-fmt": "npm:@jsr/std__fmt@^0.224.0",
     "std-legacy-path": "npm:@jsr/std__path@^0.224.0",