diff --git a/bucket/mdbook.json b/bucket/mdbook.json
index d87f2eeb50..efac03d9d1 100644
--- a/bucket/mdbook.json
+++ b/bucket/mdbook.json
@@ -1,12 +1,12 @@
 {
-    "version": "0.4.18",
+    "version": "0.4.19",
     "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/v0.4.18/mdbook-v0.4.18-x86_64-pc-windows-msvc.zip",
-            "hash": "b775785504a87bfe6e6de52d57857edf97211e281460721921f055909f2dc639"
+            "url": "https://github.com/rust-lang/mdBook/releases/download/v0.4.19/mdbook-v0.4.19-x86_64-pc-windows-msvc.zip",
+            "hash": "48822e82cee0ae2961318f3c820b001e8deb8819491593ace725d03d75cd3825"
         }
     },
     "bin": "mdbook.exe",