diff --git a/bucket/mdbook.json b/bucket/mdbook.json
index ce941185aa..bf7b551f76 100644
--- a/bucket/mdbook.json
+++ b/bucket/mdbook.json
@@ -1,12 +1,12 @@
 {
-    "version": "0.4.41",
+    "version": "0.4.42",
     "description": "Create a book from markdown files.",
     "homepage": "https://github.com/rust-lang/mdBook",
     "license": "MPL-2.0",
     "architecture": {
         "64bit": {
-            "url": "https://github.com/rust-lang/mdBook/releases/download/v0.4.41/mdbook-v0.4.41-x86_64-pc-windows-msvc.zip",
-            "hash": "cae49035275508cfa42818e3e3a9e5faa57911c45446062d1502cea0d112dcbf"
+            "url": "https://github.com/rust-lang/mdBook/releases/download/v0.4.42/mdbook-v0.4.42-x86_64-pc-windows-msvc.zip",
+            "hash": "ddddd9258e24fa742b80c41fb22035a1e666691d7483ae72f7b08f5d14f41010"
         }
     },
     "bin": "mdbook.exe",