diff --git a/package.backend.json b/package.backend.json
index a2fb7cd7..a37bcfe1 100644
--- a/package.backend.json
+++ b/package.backend.json
@@ -35,6 +35,7 @@
     "joplin-turndown-plugin-gfm": "1.0.12",
     "jsonwebtoken": "9.0.2",
     "lodash": "4.17.21",
+    "mammoth": "^1.11.0",
     "maxun-core": "0.0.38",
     "minio": "8.0.5",
     "moment-timezone": "0.5.48",