diff --git a/library/Cargo.lock b/library/Cargo.lock
index 0d978f5dcd49..9a80a930e36e 100644
--- a/library/Cargo.lock
+++ b/library/Cargo.lock
@@ -78,9 +78,9 @@ dependencies = [
 
 [[package]]
 name = "dlmalloc"
-version = "0.2.11"
+version = "0.2.13"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "06cdfe340b16dd990c54cce79743613fa09fbb16774f33a77c9fd196f8f3fa30"
+checksum = "9f5b01c17f85ee988d832c40e549a64bd89ab2c9f8d8a613bdf5122ae507e294"
 dependencies = [
  "cfg-if",
  "libc",
@@ -347,7 +347,7 @@ dependencies = [
  "wasip1",
  "wasip2",
  "wasip3",
- "windows-link 0.0.0",
+ "windows-link",
 ]
 
 [[package]]
@@ -443,85 +443,9 @@ dependencies = [
 name = "windows-link"
 version = "0.0.0"
 
-[[package]]
-name = "windows-link"
-version = "0.2.1"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "f0805222e57f7521d6a62e36fa9163bc891acd422f971defe97d64e70d0a4fe5"
-
 [[package]]
 name = "windows-sys"
-version = "0.60.2"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "f2f500e4d28234f72040990ec9d39e3a6b950f9f22d3dba18416c35882612bcb"
-dependencies = [
- "windows-targets",
-]
-
-[[package]]
-name = "windows-targets"
-version = "0.53.5"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "4945f9f551b88e0d65f3db0bc25c33b8acea4d9e41163edf90dcd0b19f9069f3"
-dependencies = [
- "windows-link 0.2.1",
- "windows_aarch64_gnullvm",
- "windows_aarch64_msvc",
- "windows_i686_gnu",
- "windows_i686_gnullvm",
- "windows_i686_msvc",
- "windows_x86_64_gnu",
- "windows_x86_64_gnullvm",
- "windows_x86_64_msvc",
-]
-
-[[package]]
-name = "windows_aarch64_gnullvm"
-version = "0.53.1"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "a9d8416fa8b42f5c947f8482c43e7d89e73a173cead56d044f6a56104a6d1b53"
-
-[[package]]
-name = "windows_aarch64_msvc"
-version = "0.53.1"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "b9d782e804c2f632e395708e99a94275910eb9100b2114651e04744e9b125006"
-
-[[package]]
-name = "windows_i686_gnu"
-version = "0.53.1"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "960e6da069d81e09becb0ca57a65220ddff016ff2d6af6a223cf372a506593a3"
-
-[[package]]
-name = "windows_i686_gnullvm"
-version = "0.53.1"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "fa7359d10048f68ab8b09fa71c3daccfb0e9b559aed648a8f95469c27057180c"
-
-[[package]]
-name = "windows_i686_msvc"
-version = "0.53.1"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "1e7ac75179f18232fe9c285163565a57ef8d3c89254a30685b57d83a38d326c2"
-
-[[package]]
-name = "windows_x86_64_gnu"
-version = "0.53.1"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "9c3842cdd74a865a8066ab39c8a7a473c0778a3f29370b5fd6b4b9aa7df4a499"
-
-[[package]]
-name = "windows_x86_64_gnullvm"
-version = "0.53.1"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "0ffa179e2d07eee8ad8f57493436566c7cc30ac536a3379fdf008f47f6bb7ae1"
-
-[[package]]
-name = "windows_x86_64_msvc"
-version = "0.53.1"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "d6bbff5f0aada427a1e5a6da5f1f98158182f26556f345ac9e04d36d0ebed650"
+version = "0.61.100"
 
 [[package]]
 name = "wit-bindgen"
diff --git a/library/Cargo.toml b/library/Cargo.toml
index 87df966bb6b8..788c990c1634 100644
--- a/library/Cargo.toml
+++ b/library/Cargo.toml
@@ -85,3 +85,6 @@ rustflags = [
 rustc-std-workspace-core = { path = 'rustc-std-workspace-core' }
 rustc-std-workspace-alloc = { path = 'rustc-std-workspace-alloc' }
 rustc-std-workspace-std = { path = 'rustc-std-workspace-std' }
+
+# See comments in `library/windows-sys/Cargo.toml` for why this is patched
+windows-sys = { path = 'windows-sys' }
diff --git a/library/windows-sys/Cargo.toml b/library/windows-sys/Cargo.toml
new file mode 100644
index 000000000000..eb27eff15e84
--- /dev/null
+++ b/library/windows-sys/Cargo.toml
@@ -0,0 +1,16 @@
+# dlmalloc has a dependency on windows-sys for when it gets compiled for Windows.
+# std however never actually uses dlmalloc on Windows. As dlmalloc is the only
+# user of windows-sys in the standard library, the windows-sys crate unnecessarily
+# increases the size of the vendored crates. By replacing it with an empty crate
+# we save about 19MB.
+
+[package]
+name = "windows-sys"
+version = "0.61.100"
+edition = "2024"
+
+[features]
+Win32_Foundation = []
+Win32_System_Memory = []
+Win32_System_Threading = []
+Win32_System_SystemInformation = []
diff --git a/library/windows-sys/src/lib.rs b/library/windows-sys/src/lib.rs
new file mode 100644
index 000000000000..112740ab2d1b
--- /dev/null
+++ b/library/windows-sys/src/lib.rs
@@ -0,0 +1 @@
+compile_error!("This crate should never be compiled");
diff --git a/src/tools/tidy/src/deps.rs b/src/tools/tidy/src/deps.rs
index 1d12456d2bb2..7c3315127989 100644
--- a/src/tools/tidy/src/deps.rs
+++ b/src/tools/tidy/src/deps.rs
@@ -543,16 +543,7 @@ pub(crate) struct WorkspaceInfo<'a> {
     "wasip2",
     "wasip3",
     "windows-link",
-    "windows-sys",
-    "windows-targets",
-    "windows_aarch64_gnullvm",
-    "windows_aarch64_msvc",
-    "windows_i686_gnu",
-    "windows_i686_gnullvm",
-    "windows_i686_msvc",
-    "windows_x86_64_gnu",
-    "windows_x86_64_gnullvm",
-    "windows_x86_64_msvc",
+    "windows-sys@0.61.100", // Enforce the usage of our dummy windows-sys patch. Keep version in sync.
     "wit-bindgen",
     // tidy-alphabetical-end
 ];