diff --git a/src/tools/rustbook/Cargo.lock b/src/tools/rustbook/Cargo.lock
index 81e0f6d572be3..3b5b31bed14a5 100644
--- a/src/tools/rustbook/Cargo.lock
+++ b/src/tools/rustbook/Cargo.lock
@@ -938,9 +938,9 @@ dependencies = [
 
 [[package]]
 name = "mdbook"
-version = "0.4.48"
+version = "0.4.49"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "8b6fbb4ac2d9fd7aa987c3510309ea3c80004a968d063c42f0d34fea070817c1"
+checksum = "d1daacee059634081dee4250d2814763a365b92dfe14bfdef964bc27835209d4"
 dependencies = [
  "ammonia",
  "anyhow",
diff --git a/src/tools/rustbook/Cargo.toml b/src/tools/rustbook/Cargo.toml
index a0b220c3557d6..10fde31306dff 100644
--- a/src/tools/rustbook/Cargo.toml
+++ b/src/tools/rustbook/Cargo.toml
@@ -15,6 +15,6 @@ mdbook-i18n-helpers = "0.3.3"
 mdbook-spec = { path = "../../doc/reference/mdbook-spec" }
 
 [dependencies.mdbook]
-version = "0.4.48"
+version = "0.4.49"
 default-features = false
 features = ["search"]