diff --git a/clients/js-legacy/package.json b/clients/js-legacy/package.json
index e369152..03ed34b 100644
--- a/clients/js-legacy/package.json
+++ b/clients/js-legacy/package.json
@@ -59,7 +59,7 @@
         "@types/node": "^26.0.0",
         "chai": "^6.2.2",
         "gh-pages": "^6.2.0",
-        "mocha": "^11.0.1",
+        "mocha": "^12.0.0",
         "oxfmt": "^0.65.0",
         "oxlint": "^1.75.0",
         "shx": "^0.4.0",