diff --git a/bucket/mdbook.json b/bucket/mdbook.json
index aeed1f4210..9c1b9bc57d 100644
--- a/bucket/mdbook.json
+++ b/bucket/mdbook.json
@@ -1,12 +1,12 @@
 {
-    "version": "0.4.33",
+    "version": "0.4.34",
     "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/v0.4.33/mdbook-v0.4.33-x86_64-pc-windows-msvc.zip",
-            "hash": "573acc650654cca12c77d73f0f7c8d22fdce92d7348c0bd4676579c60ee3c0b9"
+            "url": "https://github.com/rust-lang/mdBook/releases/download/v0.4.34/mdbook-v0.4.34-x86_64-pc-windows-msvc.zip",
+            "hash": "3679b9be098c410423797f14bae01523a2074ad0ffe8668980df074d1d4e5198"
         }
     },
     "bin": "mdbook.exe",