diff --git a/Cargo.lock b/Cargo.lock
index e9ee3c6b36ec1..bb17717aceb42 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -61,19 +61,6 @@ version = "0.2.21"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "683d7910e743518b0e34f1186f92494becacb047c7b6bf616c96772180fef923"
 
-[[package]]
-name = "ammonia"
-version = "4.0.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "1ab99eae5ee58501ab236beb6f20f6ca39be615267b014899c89b2f0bc18a459"
-dependencies = [
- "html5ever",
- "maplit",
- "once_cell",
- "tendril",
- "url",
-]
-
 [[package]]
 name = "android-tzdata"
 version = "0.1.1"
@@ -513,16 +500,6 @@ dependencies = [
  "anstyle",
  "clap_lex",
  "strsim",
- "terminal_size",
-]
-
-[[package]]
-name = "clap_complete"
-version = "4.5.42"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "33a7e468e750fa4b6be660e8b5651ad47372e8fb114030b594c2d75d48c5ffd0"
-dependencies = [
- "clap",
 ]
 
 [[package]]
@@ -1084,18 +1061,6 @@ version = "1.13.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "60b1af1c220855b6ceac025d3f6ecdd2b7c4894bfe9cd9bda4fbb4bc7c0d4cf0"
 
-[[package]]
-name = "elasticlunr-rs"
-version = "3.0.2"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "41e83863a500656dfa214fee6682de9c5b9f03de6860fec531235ed2ae9f6571"
-dependencies = [
- "regex",
- "serde",
- "serde_derive",
- "serde_json",
-]
-
 [[package]]
 name = "elsa"
 version = "1.11.0"
@@ -1159,13 +1124,6 @@ dependencies = [
  "windows-sys 0.59.0",
 ]
 
-[[package]]
-name = "error_index_generator"
-version = "0.0.0"
-dependencies = [
- "mdbook",
-]
-
 [[package]]
 name = "expect-test"
 version = "1.5.1"
@@ -1517,22 +1475,6 @@ dependencies = [
  "serde",
 ]
 
-[[package]]
-name = "handlebars"
-version = "6.3.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "3d6b224b95c1e668ac0270325ad563b2eef1469fbbb8959bc7c692c844b813d9"
-dependencies = [
- "derive_builder",
- "log",
- "num-order",
- "pest",
- "pest_derive",
- "serde",
- "serde_json",
- "thiserror 2.0.11",
-]
-
 [[package]]
 name = "hashbrown"
 version = "0.14.5"
@@ -2189,12 +2131,6 @@ version = "0.1.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "c41e0c4fef86961ac6d6f8a82609f55f31b05e4fce149ac5710e439df7619ba4"
 
-[[package]]
-name = "maplit"
-version = "1.0.2"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "3e2e65a1a2e43cfcb47a895c4c8b10d1f4a61097f9f254f183aee60cad9c651d"
-
 [[package]]
 name = "markup5ever"
 version = "0.12.1"
@@ -2228,34 +2164,6 @@ dependencies = [
  "digest",
 ]
 
-[[package]]
-name = "mdbook"
-version = "0.4.43"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "fe1f98b8d66e537d2f0ba06e7dec4f44001deec539a2d18bfc102d6a86189148"
-dependencies = [
- "ammonia",
- "anyhow",
- "chrono",
- "clap",
- "clap_complete",
- "elasticlunr-rs",
- "env_logger",
- "handlebars",
- "log",
- "memchr",
- "once_cell",
- "opener",
- "pulldown-cmark 0.10.3",
- "regex",
- "serde",
- "serde_json",
- "shlex",
- "tempfile",
- "toml 0.5.11",
- "topological-sort",
-]
-
 [[package]]
 name = "measureme"
 version = "11.0.1"
@@ -2483,21 +2391,6 @@ dependencies = [
  "num-traits",
 ]
 
-[[package]]
-name = "num-modular"
-version = "0.6.1"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "17bb261bf36fa7d83f4c294f834e91256769097b3cb505d44831e0a179ac647f"
-
-[[package]]
-name = "num-order"
-version = "1.2.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "537b596b97c40fcf8056d153049eb22f481c17ebce72a513ec9286e4986d1bb6"
-dependencies = [
- "num-modular",
-]
-
 [[package]]
 name = "num-rational"
 version = "0.4.2"
@@ -2718,51 +2611,6 @@ dependencies = [
  "libc",
 ]
 
-[[package]]
-name = "pest"
-version = "2.7.15"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "8b7cafe60d6cf8e62e1b9b2ea516a089c008945bb5a275416789e7db0bc199dc"
-dependencies = [
- "memchr",
- "thiserror 2.0.11",
- "ucd-trie",
-]
-
-[[package]]
-name = "pest_derive"
-version = "2.7.15"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "816518421cfc6887a0d62bf441b6ffb4536fcc926395a69e1a85852d4363f57e"
-dependencies = [
- "pest",
- "pest_generator",
-]
-
-[[package]]
-name = "pest_generator"
-version = "2.7.15"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "7d1396fd3a870fc7838768d171b4616d5c91f6cc25e377b673d714567d99377b"
-dependencies = [
- "pest",
- "pest_meta",
- "proc-macro2",
- "quote",
- "syn 2.0.96",
-]
-
-[[package]]
-name = "pest_meta"
-version = "2.7.15"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "e1e58089ea25d717bfd31fb534e4f3afcc2cc569c70de3e239778991ea3b7dea"
-dependencies = [
- "once_cell",
- "pest",
- "sha2",
-]
-
 [[package]]
 name = "phf"
 version = "0.11.3"
@@ -2921,18 +2769,6 @@ dependencies = [
  "unicase",
 ]
 
-[[package]]
-name = "pulldown-cmark"
-version = "0.10.3"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "76979bea66e7875e7509c4ec5300112b316af87fa7a252ca91c448b32dfe3993"
-dependencies = [
- "bitflags",
- "memchr",
- "pulldown-cmark-escape 0.10.1",
- "unicase",
-]
-
 [[package]]
 name = "pulldown-cmark"
 version = "0.11.3"
@@ -2941,16 +2777,10 @@ checksum = "679341d22c78c6c649893cbd6c3278dcbe9fc4faa62fea3a9296ae2b50c14625"
 dependencies = [
  "bitflags",
  "memchr",
- "pulldown-cmark-escape 0.11.0",
+ "pulldown-cmark-escape",
  "unicase",
 ]
 
-[[package]]
-name = "pulldown-cmark-escape"
-version = "0.10.1"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "bd348ff538bc9caeda7ee8cad2d1d48236a1f443c1fa3913c6a02fe0043b1dd3"
-
 [[package]]
 name = "pulldown-cmark-escape"
 version = "0.11.0"
@@ -5310,16 +5140,6 @@ dependencies = [
  "winapi-util",
 ]
 
-[[package]]
-name = "terminal_size"
-version = "0.4.1"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "5352447f921fda68cf61b4101566c0bdb5104eff6804d0678e5227580ab6a4e9"
-dependencies = [
- "rustix",
- "windows-sys 0.59.0",
-]
-
 [[package]]
 name = "termize"
 version = "0.1.1"
@@ -5560,12 +5380,6 @@ dependencies = [
  "winnow",
 ]
 
-[[package]]
-name = "topological-sort"
-version = "0.2.2"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "ea68304e134ecd095ac6c3574494fc62b909f416c4fca77e440530221e549d3d"
-
 [[package]]
 name = "tracing"
 version = "0.1.37"
@@ -5686,12 +5500,6 @@ dependencies = [
  "regex-lite",
 ]
 
-[[package]]
-name = "ucd-trie"
-version = "0.1.7"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "2896d95c02a80c6d6a5d6e953d479f5ddf2dfdb6a244441010e373ac0fb88971"
-
 [[package]]
 name = "ui_test"
 version = "0.26.5"
diff --git a/Cargo.toml b/Cargo.toml
index 97e782d0df020..20a43aaaeeb37 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -13,7 +13,6 @@ members = [
   "src/tools/clippy/clippy_dev",
   "src/tools/compiletest",
   "src/tools/run-make-support",
-  "src/tools/error_index_generator",
   "src/tools/linkchecker",
   "src/tools/lint-docs",
   "src/tools/miropt-test-tools",
diff --git a/src/bootstrap/src/utils/proc_macro_deps.rs b/src/bootstrap/src/utils/proc_macro_deps.rs
index dbfd6f47dc67f..34bf6bb7013ff 100644
--- a/src/bootstrap/src/utils/proc_macro_deps.rs
+++ b/src/bootstrap/src/utils/proc_macro_deps.rs
@@ -6,25 +6,18 @@ pub static CRATES: &[&str] = &[
     "annotate-snippets",
     "anstyle",
     "basic-toml",
-    "block-buffer",
     "bumpalo",
-    "cfg-if",
-    "cpufeatures",
-    "crypto-common",
     "darling",
     "darling_core",
     "derive_builder_core",
-    "digest",
     "fluent-bundle",
     "fluent-langneg",
     "fluent-syntax",
     "fnv",
-    "generic-array",
     "heck",
     "ident_case",
     "intl-memoizer",
     "intl_pluralrules",
-    "libc",
     "log",
     "memchr",
     "mime",
@@ -32,17 +25,12 @@ pub static CRATES: &[&str] = &[
     "minimal-lexical",
     "nom",
     "num-conv",
-    "once_cell",
-    "pest",
-    "pest_generator",
-    "pest_meta",
     "proc-macro2",
     "quote",
     "rinja_parser",
     "rustc-hash",
     "self_cell",
     "serde",
-    "sha2",
     "smallvec",
     "stable_deref_trait",
     "strsim",
@@ -52,15 +40,12 @@ pub static CRATES: &[&str] = &[
     "time-core",
     "tinystr",
     "type-map",
-    "typenum",
-    "ucd-trie",
     "unic-langid",
     "unic-langid-impl",
     "unic-langid-macros",
     "unicase",
     "unicode-ident",
     "unicode-width",
-    "version_check",
     "wasm-bindgen-backend",
     "wasm-bindgen-macro-support",
     "wasm-bindgen-shared",
diff --git a/src/tools/error_index_generator/Cargo.toml b/src/tools/error_index_generator/Cargo.toml
index f4dac6e947e32..54fe7f6eb5a9b 100644
--- a/src/tools/error_index_generator/Cargo.toml
+++ b/src/tools/error_index_generator/Cargo.toml
@@ -2,6 +2,7 @@
 name = "error_index_generator"
 version = "0.0.0"
 edition = "2021"
+workspace = "../rustbook"
 
 [dependencies]
 mdbook = { version = "0.4", default-features = false, features = ["search"] }
diff --git a/src/tools/rustbook/Cargo.lock b/src/tools/rustbook/Cargo.lock
index b31bf61a6fbad..ddcf315a2672d 100644
--- a/src/tools/rustbook/Cargo.lock
+++ b/src/tools/rustbook/Cargo.lock
@@ -446,6 +446,13 @@ dependencies = [
  "windows-sys",
 ]
 
+[[package]]
+name = "error_index_generator"
+version = "0.0.0"
+dependencies = [
+ "mdbook",
+]
+
 [[package]]
 name = "fastrand"
 version = "2.3.0"
@@ -867,9 +874,9 @@ dependencies = [
 
 [[package]]
 name = "mdbook"
-version = "0.4.44"
+version = "0.4.45"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "f9da1e54401fe5d45a664c57e112e70f18e8c5a73e268c179305b932ee864574"
+checksum = "b07d36d96ffe1b5b16ddf2bc80b3b26bb7a498b2a6591061250bf0af8e8095ad"
 dependencies = [
  "ammonia",
  "anyhow",
diff --git a/src/tools/rustbook/Cargo.toml b/src/tools/rustbook/Cargo.toml
index 9f9846cdee07d..6aec0bec0fa09 100644
--- a/src/tools/rustbook/Cargo.toml
+++ b/src/tools/rustbook/Cargo.toml
@@ -1,4 +1,5 @@
 [workspace]
+members = ["../error_index_generator"]
 
 [package]
 name = "rustbook"
@@ -14,6 +15,6 @@ mdbook-i18n-helpers = "0.3.3"
 mdbook-spec = { path = "../../doc/reference/mdbook-spec" }
 
 [dependencies.mdbook]
-version = "0.4.44"
+version = "0.4.45"
 default-features = false
 features = ["search"]
diff --git a/src/tools/tidy/src/deps.rs b/src/tools/tidy/src/deps.rs
index e8e7dfe0d84c1..51e58b4e4fcfd 100644
--- a/src/tools/tidy/src/deps.rs
+++ b/src/tools/tidy/src/deps.rs
@@ -99,7 +99,6 @@ const EXCEPTIONS: ExceptionList = &[
     ("dissimilar", "Apache-2.0"),                            // rustdoc, rustc_lexer (few tests) via expect-test, (dev deps)
     ("fluent-langneg", "Apache-2.0"),                        // rustc (fluent translations)
     ("foldhash", "Zlib"),                                    // rustc
-    ("mdbook", "MPL-2.0"),                                   // mdbook
     ("option-ext", "MPL-2.0"),                               // cargo-miri (via `directories`)
     ("rustc_apfloat", "Apache-2.0 WITH LLVM-exception"),     // rustc (license is the same as LLVM uses)
     ("ryu", "Apache-2.0 OR BSL-1.0"), // BSL is not acceptble, but we use it under Apache-2.0                       // cargo/... (because of serde)
@@ -667,7 +666,7 @@ pub static CRATES: &[&str] = &[
         for extra in expected.difference(&proc_macro_deps) {
             tidy_error!(
                 bad,
-                "`{extra}` is not registered in `src/bootstrap/src/utils/proc_macro_deps.rs`, but is not a proc-macro crate dependency",
+                "`{extra}` is registered in `src/bootstrap/src/utils/proc_macro_deps.rs`, but is not a proc-macro crate dependency",
             );
         }
         if *bad != old_bad {