diff --git a/CHANGELOG.md b/CHANGELOG.md
index 3562e5dd..d8d54501 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -10,6 +10,8 @@ Note: In this file, do not use the hard wrap in the middle of a sentence for com
 
 ## [Unreleased]
 
+- Update `mdbook@latest` to 0.4.28.
+
 ## [2.5.4] - 2023-02-28
 
 - Update `cargo-llvm-cov@latest` to 0.5.11.
diff --git a/manifests/mdbook.json b/manifests/mdbook.json
index 412223e9..d9e4ebc9 100644
--- a/manifests/mdbook.json
+++ b/manifests/mdbook.json
@@ -17,10 +17,24 @@
     }
   },
   "latest": {
-    "version": "0.4.27"
+    "version": "0.4.28"
   },
   "0.4": {
-    "version": "0.4.27"
+    "version": "0.4.28"
+  },
+  "0.4.28": {
+    "x86_64_linux_musl": {
+      "checksum": "84e3a4982c19e19b1d058af30b8835097109f520cb6c2e9e03413a896c9787aa"
+    },
+    "x86_64_macos": {
+      "checksum": "46605497fac2a379a02fa7287c0e4601a0cdfa2f913a4f1a06d820d91c0c310e"
+    },
+    "x86_64_windows": {
+      "checksum": "996bc212502e51da1d69090134d13cf51ff21e478be9b7e2aeb1d330c7865e35"
+    },
+    "aarch64_linux_musl": {
+      "checksum": "86b01509773e4011a9372de2932ceb0fdd52063153c7a673f63eeacf16c8426b"
+    }
   },
   "0.4.27": {
     "x86_64_linux_musl": {