diff --git a/bucket/mdbook.json b/bucket/mdbook.json
index a0b3ea4157..fcb1906e48 100644
--- a/bucket/mdbook.json
+++ b/bucket/mdbook.json
@@ -1,12 +1,12 @@
 {
-    "version": "0.5.0",
+    "version": "0.5.1",
     "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/v0.5.0/mdbook-v0.5.0-x86_64-pc-windows-msvc.zip",
-            "hash": "9d7b6b3506723c2ec00eb539b945472aad0222fe6f7905982cba064e7e1a3ea5"
+            "url": "https://github.com/rust-lang/mdBook/releases/download/v0.5.1/mdbook-v0.5.1-x86_64-pc-windows-msvc.zip",
+            "hash": "81d66447326ba7d595d546b3986f889ce617c6ecde7d713920996eba616a061d"
         }
     },
     "bin": "mdbook.exe",