diff --git a/Cargo.lock b/Cargo.lock
index 1254421aa58..3c302fb826c 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -784,12 +784,6 @@ dependencies = [
  "windows-sys 0.52.0",
 ]
 
-[[package]]
-name = "convert_case"
-version = "0.4.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "6245d59a3e82a7fc217c5828a6692dbc6dfb63a0c8c90495621f7b9d79704a0e"
-
 [[package]]
 name = "core"
 version = "0.0.0"
@@ -1035,10 +1029,8 @@ version = "0.99.17"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "4fb810d30a7c1953f91334de7244731fc3f3c10d7fe163338a35b9f640960321"
 dependencies = [
- "convert_case",
  "proc-macro2",
  "quote",
- "rustc_version",
  "syn 1.0.109",
 ]
 
@@ -3497,7 +3489,7 @@ dependencies = [
 name = "rustc_ast_passes"
 version = "0.0.0"
 dependencies = [
- "itertools 0.11.0",
+ "itertools 0.12.1",
  "rustc_ast",
  "rustc_ast_pretty",
  "rustc_attr",
@@ -3517,7 +3509,7 @@ dependencies = [
 name = "rustc_ast_pretty"
 version = "0.0.0"
 dependencies = [
- "itertools 0.11.0",
+ "itertools 0.12.1",
  "rustc_ast",
  "rustc_lexer",
  "rustc_span",
@@ -3558,7 +3550,7 @@ name = "rustc_borrowck"
 version = "0.0.0"
 dependencies = [
  "either",
- "itertools 0.11.0",
+ "itertools 0.12.1",
  "polonius-engine",
  "rustc_data_structures",
  "rustc_errors",
@@ -3611,7 +3603,7 @@ name = "rustc_codegen_llvm"
 version = "0.0.0"
 dependencies = [
  "bitflags 2.4.2",
- "itertools 0.11.0",
+ "itertools 0.12.1",
  "libc",
  "measureme",
  "object",
@@ -3647,7 +3639,7 @@ dependencies = [
  "ar_archive_writer",
  "bitflags 2.4.2",
  "cc",
- "itertools 0.11.0",
+ "itertools 0.12.1",
  "jobserver",
  "libc",
  "object",
@@ -3929,7 +3921,7 @@ dependencies = [
 name = "rustc_hir_analysis"
 version = "0.0.0"
 dependencies = [
- "itertools 0.11.0",
+ "itertools 0.12.1",
  "rustc_arena",
  "rustc_ast",
  "rustc_attr",
@@ -3968,7 +3960,7 @@ dependencies = [
 name = "rustc_hir_typeck"
 version = "0.0.0"
 dependencies = [
- "itertools 0.11.0",
+ "itertools 0.12.1",
  "rustc_ast",
  "rustc_ast_ir",
  "rustc_attr",
@@ -4216,7 +4208,6 @@ name = "rustc_middle"
 version = "0.0.0"
 dependencies = [
  "bitflags 2.4.2",
- "derive_more",
  "either",
  "field-offset",
  "gsgdt",
@@ -4254,7 +4245,7 @@ name = "rustc_mir_build"
 version = "0.0.0"
 dependencies = [
  "either",
- "itertools 0.11.0",
+ "itertools 0.12.1",
  "rustc_apfloat",
  "rustc_arena",
  "rustc_ast",
@@ -4301,7 +4292,7 @@ name = "rustc_mir_transform"
 version = "0.0.0"
 dependencies = [
  "either",
- "itertools 0.11.0",
+ "itertools 0.12.1",
  "rustc_arena",
  "rustc_ast",
  "rustc_attr",
@@ -4381,7 +4372,6 @@ dependencies = [
 name = "rustc_passes"
 version = "0.0.0"
 dependencies = [
- "itertools 0.11.0",
  "rustc_ast",
  "rustc_ast_pretty",
  "rustc_attr",
@@ -4632,7 +4622,7 @@ name = "rustc_trait_selection"
 version = "0.0.0"
 dependencies = [
  "bitflags 2.4.2",
- "itertools 0.11.0",
+ "itertools 0.12.1",
  "rustc_ast",
  "rustc_ast_ir",
  "rustc_attr",
@@ -4672,7 +4662,7 @@ dependencies = [
 name = "rustc_transmute"
 version = "0.0.0"
 dependencies = [
- "itertools 0.11.0",
+ "itertools 0.12.1",
  "rustc_ast_ir",
  "rustc_data_structures",
  "rustc_hir",
@@ -4688,7 +4678,7 @@ dependencies = [
 name = "rustc_ty_utils"
 version = "0.0.0"
 dependencies = [
- "itertools 0.11.0",
+ "itertools 0.12.1",
  "rustc_ast_ir",
  "rustc_data_structures",
  "rustc_errors",
@@ -4738,7 +4728,7 @@ dependencies = [
  "askama",
  "expect-test",
  "indexmap",
- "itertools 0.11.0",
+ "itertools 0.12.1",
  "minifier",
  "once_cell",
  "regex",
diff --git a/compiler/rustc_ast_passes/Cargo.toml b/compiler/rustc_ast_passes/Cargo.toml
index 99e79f65fb4..eace5ce8208 100644
--- a/compiler/rustc_ast_passes/Cargo.toml
+++ b/compiler/rustc_ast_passes/Cargo.toml
@@ -5,7 +5,7 @@ edition = "2021"
 
 [dependencies]
 # tidy-alphabetical-start
-itertools = "0.11"
+itertools = "0.12"
 rustc_ast = { path = "../rustc_ast" }
 rustc_ast_pretty = { path = "../rustc_ast_pretty" }
 rustc_attr = { path = "../rustc_attr" }
diff --git a/compiler/rustc_ast_pretty/Cargo.toml b/compiler/rustc_ast_pretty/Cargo.toml
index b38a2915a43..9ae5c9b3cec 100644
--- a/compiler/rustc_ast_pretty/Cargo.toml
+++ b/compiler/rustc_ast_pretty/Cargo.toml
@@ -5,7 +5,7 @@ edition = "2021"
 
 [dependencies]
 # tidy-alphabetical-start
-itertools = "0.11"
+itertools = "0.12"
 rustc_ast = { path = "../rustc_ast" }
 rustc_lexer = { path = "../rustc_lexer" }
 rustc_span = { path = "../rustc_span" }
diff --git a/compiler/rustc_borrowck/Cargo.toml b/compiler/rustc_borrowck/Cargo.toml
index 714f46270f9..bafc62c7318 100644
--- a/compiler/rustc_borrowck/Cargo.toml
+++ b/compiler/rustc_borrowck/Cargo.toml
@@ -6,7 +6,7 @@ edition = "2021"
 [dependencies]
 # tidy-alphabetical-start
 either = "1.5.0"
-itertools = "0.11"
+itertools = "0.12"
 polonius-engine = "0.13.0"
 rustc_data_structures = { path = "../rustc_data_structures" }
 rustc_errors = { path = "../rustc_errors" }
diff --git a/compiler/rustc_codegen_llvm/Cargo.toml b/compiler/rustc_codegen_llvm/Cargo.toml
index 3948a49ee2a..3fda59e8b52 100644
--- a/compiler/rustc_codegen_llvm/Cargo.toml
+++ b/compiler/rustc_codegen_llvm/Cargo.toml
@@ -9,7 +9,7 @@ test = false
 [dependencies]
 # tidy-alphabetical-start
 bitflags = "2.4.1"
-itertools = "0.11"
+itertools = "0.12"
 libc = "0.2"
 measureme = "11"
 object = { version = "0.32.0", default-features = false, features = ["std", "read"] }
diff --git a/compiler/rustc_codegen_ssa/Cargo.toml b/compiler/rustc_codegen_ssa/Cargo.toml
index 81ca42e1ad8..7851b9e8e03 100644
--- a/compiler/rustc_codegen_ssa/Cargo.toml
+++ b/compiler/rustc_codegen_ssa/Cargo.toml
@@ -8,7 +8,7 @@ edition = "2021"
 ar_archive_writer = "0.1.5"
 bitflags = "2.4.1"
 cc = "1.0.90"
-itertools = "0.11"
+itertools = "0.12"
 jobserver = "0.1.28"
 pathdiff = "0.2.0"
 regex = "1.4"
diff --git a/compiler/rustc_hir_analysis/Cargo.toml b/compiler/rustc_hir_analysis/Cargo.toml
index 648b569a217..04ca7f123d3 100644
--- a/compiler/rustc_hir_analysis/Cargo.toml
+++ b/compiler/rustc_hir_analysis/Cargo.toml
@@ -9,7 +9,7 @@ doctest = false
 
 [dependencies]
 # tidy-alphabetical-start
-itertools = "0.11"
+itertools = "0.12"
 rustc_arena = { path = "../rustc_arena" }
 rustc_ast = { path = "../rustc_ast" }
 rustc_attr = { path = "../rustc_attr" }
diff --git a/compiler/rustc_hir_typeck/Cargo.toml b/compiler/rustc_hir_typeck/Cargo.toml
index 0a5fa37ed04..9e7f0776b60 100644
--- a/compiler/rustc_hir_typeck/Cargo.toml
+++ b/compiler/rustc_hir_typeck/Cargo.toml
@@ -5,7 +5,7 @@ edition = "2021"
 
 [dependencies]
 # tidy-alphabetical-start
-itertools = "0.11"
+itertools = "0.12"
 rustc_ast = { path = "../rustc_ast" }
 rustc_ast_ir = { path = "../rustc_ast_ir" }
 rustc_attr = { path = "../rustc_attr" }
diff --git a/compiler/rustc_middle/Cargo.toml b/compiler/rustc_middle/Cargo.toml
index 5a24a7ab0bd..96c58ef411b 100644
--- a/compiler/rustc_middle/Cargo.toml
+++ b/compiler/rustc_middle/Cargo.toml
@@ -6,7 +6,6 @@ edition = "2021"
 [dependencies]
 # tidy-alphabetical-start
 bitflags = "2.4.1"
-derive_more = "0.99.17"
 either = "1.5.0"
 field-offset = "0.3.5"
 gsgdt = "0.1.2"
diff --git a/compiler/rustc_mir_build/Cargo.toml b/compiler/rustc_mir_build/Cargo.toml
index d71f7121322..6618e4f5a00 100644
--- a/compiler/rustc_mir_build/Cargo.toml
+++ b/compiler/rustc_mir_build/Cargo.toml
@@ -6,7 +6,7 @@ edition = "2021"
 [dependencies]
 # tidy-alphabetical-start
 either = "1"
-itertools = "0.11"
+itertools = "0.12"
 rustc_apfloat = "0.2.0"
 rustc_arena = { path = "../rustc_arena" }
 rustc_ast = { path = "../rustc_ast" }
diff --git a/compiler/rustc_mir_transform/Cargo.toml b/compiler/rustc_mir_transform/Cargo.toml
index 9cc083edb44..bd0a54ef363 100644
--- a/compiler/rustc_mir_transform/Cargo.toml
+++ b/compiler/rustc_mir_transform/Cargo.toml
@@ -6,7 +6,7 @@ edition = "2021"
 [dependencies]
 # tidy-alphabetical-start
 either = "1"
-itertools = "0.11"
+itertools = "0.12"
 rustc_arena = { path = "../rustc_arena" }
 rustc_ast = { path = "../rustc_ast" }
 rustc_attr = { path = "../rustc_attr" }
diff --git a/compiler/rustc_passes/Cargo.toml b/compiler/rustc_passes/Cargo.toml
index 80e6c104bd4..6abfa08c530 100644
--- a/compiler/rustc_passes/Cargo.toml
+++ b/compiler/rustc_passes/Cargo.toml
@@ -5,7 +5,6 @@ edition = "2021"
 
 [dependencies]
 # tidy-alphabetical-start
-itertools = "0.11"
 rustc_ast = { path = "../rustc_ast" }
 rustc_ast_pretty = { path = "../rustc_ast_pretty" }
 rustc_attr = { path = "../rustc_attr" }
diff --git a/compiler/rustc_trait_selection/Cargo.toml b/compiler/rustc_trait_selection/Cargo.toml
index 3a58d41fcd0..811eb4c9810 100644
--- a/compiler/rustc_trait_selection/Cargo.toml
+++ b/compiler/rustc_trait_selection/Cargo.toml
@@ -6,7 +6,7 @@ edition = "2021"
 [dependencies]
 # tidy-alphabetical-start
 bitflags = "2.4.1"
-itertools = "0.11.0"
+itertools = "0.12"
 rustc_ast = { path = "../rustc_ast" }
 rustc_ast_ir = { path = "../rustc_ast_ir" }
 rustc_attr = { path = "../rustc_attr" }
diff --git a/compiler/rustc_transmute/Cargo.toml b/compiler/rustc_transmute/Cargo.toml
index 3d0ad31747f..79939d62a51 100644
--- a/compiler/rustc_transmute/Cargo.toml
+++ b/compiler/rustc_transmute/Cargo.toml
@@ -29,5 +29,5 @@ rustc = [
 
 [dev-dependencies]
 # tidy-alphabetical-start
-itertools = "0.11"
+itertools = "0.12"
 # tidy-alphabetical-end
diff --git a/compiler/rustc_ty_utils/Cargo.toml b/compiler/rustc_ty_utils/Cargo.toml
index 2a30bd5d539..01d5251bfa0 100644
--- a/compiler/rustc_ty_utils/Cargo.toml
+++ b/compiler/rustc_ty_utils/Cargo.toml
@@ -5,7 +5,7 @@ edition = "2021"
 
 [dependencies]
 # tidy-alphabetical-start
-itertools = "0.11"
+itertools = "0.12"
 rustc_ast_ir = { path = "../rustc_ast_ir" }
 rustc_data_structures = { path = "../rustc_data_structures" }
 rustc_errors = { path = "../rustc_errors" }
diff --git a/src/librustdoc/Cargo.toml b/src/librustdoc/Cargo.toml
index e13e95ef708..bd0fbef998b 100644
--- a/src/librustdoc/Cargo.toml
+++ b/src/librustdoc/Cargo.toml
@@ -9,7 +9,7 @@ path = "lib.rs"
 [dependencies]
 arrayvec = { version = "0.7", default-features = false }
 askama = { version = "0.12", default-features = false, features = ["config"] }
-itertools = "0.11"
+itertools = "0.12"
 indexmap = "2"
 minifier = "0.3.0"
 once_cell = "1.10.0"
diff --git a/src/tools/tidy/src/deps.rs b/src/tools/tidy/src/deps.rs
index 79bc380c1e9..10fdfc0a65f 100644
--- a/src/tools/tidy/src/deps.rs
+++ b/src/tools/tidy/src/deps.rs
@@ -209,7 +209,6 @@ const PERMITTED_RUSTC_DEPENDENCIES: &[&str] = &[
     "cc",
     "cfg-if",
     "compiler_builtins",
-    "convert_case", // dependency of derive_more
     "cpufeatures",
     "crc32fast",
     "crossbeam-channel",