diff --git a/Cargo.lock b/Cargo.lock
index 853acd1abd6..074c33cfb59 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -3497,7 +3497,7 @@ 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 +3517,7 @@ 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 +3558,7 @@ 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 +3611,7 @@ 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 +3647,7 @@ dependencies = [
  "ar_archive_writer",
  "bitflags 2.4.2",
  "cc",
- "itertools 0.11.0",
+ "itertools 0.12.1",
  "jobserver",
  "libc",
  "object",
@@ -3929,7 +3929,7 @@ 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 +3968,7 @@ 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",
@@ -4255,7 +4255,7 @@ name = "rustc_mir_build"
 version = "0.0.0"
 dependencies = [
  "either",
- "itertools 0.11.0",
+ "itertools 0.12.1",
  "rustc_apfloat",
  "rustc_arena",
  "rustc_ast",
@@ -4302,7 +4302,7 @@ name = "rustc_mir_transform"
 version = "0.0.0"
 dependencies = [
  "either",
- "itertools 0.11.0",
+ "itertools 0.12.1",
  "rustc_arena",
  "rustc_ast",
  "rustc_attr",
@@ -4382,7 +4382,6 @@ dependencies = [
 name = "rustc_passes"
 version = "0.0.0"
 dependencies = [
- "itertools 0.11.0",
  "rustc_ast",
  "rustc_ast_pretty",
  "rustc_attr",
@@ -4632,7 +4631,7 @@ 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 +4671,7 @@ 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 +4687,7 @@ 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 +4737,7 @@ 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_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"