diff --git a/bucket/mdbook.json b/bucket/mdbook.json
index e6aea4ffcb..794f617cc5 100644
--- a/bucket/mdbook.json
+++ b/bucket/mdbook.json
@@ -1,12 +1,12 @@
 {
-    "version": "0.4.27",
+    "version": "0.4.28",
     "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/v0.4.27/mdbook-v0.4.27-x86_64-pc-windows-msvc.zip",
-            "hash": "18c7eea09bee53f539a11ec965547147afc2083c4cac22563b724aecf57b57bb"
+            "url": "https://github.com/rust-lang/mdBook/releases/download/v0.4.28/mdbook-v0.4.28-x86_64-pc-windows-msvc.zip",
+            "hash": "996bc212502e51da1d69090134d13cf51ff21e478be9b7e2aeb1d330c7865e35"
         }
     },
     "bin": "mdbook.exe",