diff --git a/bucket/mdbook.json b/bucket/mdbook.json
index 857fb58373..29ac55e260 100644
--- a/bucket/mdbook.json
+++ b/bucket/mdbook.json
@@ -1,12 +1,12 @@
 {
-    "version": "0.4.4",
+    "version": "0.4.5",
     "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/v0.4.4/mdbook-v0.4.4-x86_64-pc-windows-msvc.zip",
-            "hash": "7c5632c83889c4fb65dc1bf061253da7e680a8ec63076a14cc117721ecaf79fe"
+            "url": "https://github.com/rust-lang/mdBook/releases/download/v0.4.5/mdbook-v0.4.5-x86_64-pc-windows-msvc.zip",
+            "hash": "0cd0dbee829623a96029ec67a52bb11470773c8d5eb3621eca6419948300a8b8"
         }
     },
     "bin": "mdbook.exe",