diff --git a/bucket/mdbook.json b/bucket/mdbook.json
index d497bf3694..d87f2eeb50 100644
--- a/bucket/mdbook.json
+++ b/bucket/mdbook.json
@@ -1,12 +1,12 @@
 {
-    "version": "0.4.17",
+    "version": "0.4.18",
     "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/v0.4.17/mdbook-v0.4.17-x86_64-pc-windows-msvc.zip",
-            "hash": "380294a6d8c47fc3064e272dac0b995dfc0fec9daeb4f0ad738c3b20dc286879"
+            "url": "https://github.com/rust-lang/mdBook/releases/download/v0.4.18/mdbook-v0.4.18-x86_64-pc-windows-msvc.zip",
+            "hash": "b775785504a87bfe6e6de52d57857edf97211e281460721921f055909f2dc639"
         }
     },
     "bin": "mdbook.exe",