diff --git a/package.json b/package.json
index 810618ae488..13acd63a860 100644
--- a/package.json
+++ b/package.json
@@ -47,7 +47,7 @@
     "commonmark": "^0.28.1",
     "core-js": "^2.5.1",
     "css.escape": "1.5.1",
-    "deep-extend": "0.4.1",
+    "deep-extend": "0.5.1",
     "dompurify": "^1.0.4",
     "expect": "1.20.2",
     "getbase": "^2.8.2",