diff --git a/Cargo.lock b/Cargo.lock
index e973d7f9a2a..47ad7ab3e98 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -2177,9 +2177,9 @@ dependencies = [
 
 [[package]]
 name = "memchr"
-version = "2.5.0"
+version = "2.7.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "2dffe52ecf27772e601905b7522cb4ef790d2cc203488bbd0e2fe85fcb74566d"
+checksum = "78ca9ab1a0babb1e7d5695e3530886289c18cf2f87ec19a575a0abdce112e3a3"
 
 [[package]]
 name = "memmap2"
diff --git a/compiler/rustc_ast/Cargo.toml b/compiler/rustc_ast/Cargo.toml
index d33f9666b48..34c612dac69 100644
--- a/compiler/rustc_ast/Cargo.toml
+++ b/compiler/rustc_ast/Cargo.toml
@@ -4,10 +4,9 @@ version = "0.0.0"
 edition = "2021"
 
 [dependencies]
-# FIXME: bumping memchr to 2.7.1 causes linker errors in MSVC thin-lto
 # tidy-alphabetical-start
 bitflags = "2.4.1"
-memchr = "=2.5.0"
+memchr = "2.7.4"
 rustc_ast_ir = { path = "../rustc_ast_ir" }
 rustc_data_structures = { path = "../rustc_data_structures" }
 rustc_index = { path = "../rustc_index" }
diff --git a/library/Cargo.lock b/library/Cargo.lock
index ded30dd82f7..2343b2baf83 100644
--- a/library/Cargo.lock
+++ b/library/Cargo.lock
@@ -326,6 +326,7 @@ dependencies = [
  "hashbrown",
  "hermit-abi",
  "libc",
+ "memchr",
  "miniz_oxide",
  "object",
  "panic_abort",
diff --git a/library/std/Cargo.toml b/library/std/Cargo.toml
index 9a31fd21dc7..ea11586f9a5 100644
--- a/library/std/Cargo.toml
+++ b/library/std/Cargo.toml
@@ -23,6 +23,10 @@ unwind = { path = "../unwind" }
 hashbrown = { version = "0.14", default-features = false, features = [
     'rustc-dep-of-std',
 ] }
+# FIXME(#127890): `object` depends on `memchr`, but `memchr` > v2.5 causes
+# issues with LTO. This dependency is not used directly, but pin it here so
+# it resolves to 2.5. To be removed once rust-lang/rust#127890 is fixed.
+memchr = { version = "=2.5.0", default-features = false, features = ["rustc-dep-of-std"] }
 std_detect = { path = "../stdarch/crates/std_detect", default-features = false, features = [
     'rustc-dep-of-std',
 ] }