diff --git a/bucket/mdbook.json b/bucket/mdbook.json
index 30b8ff4702..e8629b9c62 100644
--- a/bucket/mdbook.json
+++ b/bucket/mdbook.json
@@ -1,12 +1,12 @@
 {
-    "version": "0.4.0",
+    "version": "0.4.1",
     "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/v0.4.0/mdbook-v0.4.0-x86_64-pc-windows-msvc.zip",
-            "hash": "4f099c12e4487c296311da2a961617c98ec3866bbd3d1f58733433334ac7c94e"
+            "url": "https://github.com/rust-lang/mdBook/releases/download/v0.4.1/mdbook-v0.4.1-x86_64-pc-windows-msvc.zip",
+            "hash": "020112f87404cf08abff760d72ba0bca1a2cab98ea4b0e7b4fe08ce7a2f2778e"
         }
     },
     "bin": "mdbook.exe",