diff --git a/Cargo.lock b/Cargo.lock
index f1304735f8fad..0ebb634eb3524 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -3447,8 +3447,7 @@ dependencies = [
 [[package]]
 name = "rustc-hash"
 version = "1.1.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "08d43f7aa6b08d49f382cde6a7982047c3426db949b1424bc4b7ec9ae12c6ce2"
+source = "git+https://github.com/orlp/rustc-hash/?branch=mum-hash-perf-run#223c31462e3b1376abb1a7ccbd2863153fd10a2a"
 
 [[package]]
 name = "rustc-main"
diff --git a/Cargo.toml b/Cargo.toml
index a601ebf4369e0..a33a52e17db57 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -111,3 +111,4 @@ strip = true
 rustc-std-workspace-core = { path = 'library/rustc-std-workspace-core' }
 rustc-std-workspace-alloc = { path = 'library/rustc-std-workspace-alloc' }
 rustc-std-workspace-std = { path = 'library/rustc-std-workspace-std' }
+rustc-hash = { git = "https://github.com/orlp/rustc-hash/", branch = "mum-hash-perf-run" }
\ No newline at end of file