diff --git a/.gitmodules b/.gitmodules
index 9ad207a0d5226..a1de9daffd9df 100644
--- a/.gitmodules
+++ b/.gitmodules
@@ -32,8 +32,8 @@
 	shallow = true
 [submodule "src/llvm-project"]
 	path = src/llvm-project
-	url = https://github.com/rust-lang/llvm-project.git
-	branch = rustc/18.1-2024-05-19
+	url = https://github.com/DianQK/llvm-project.git
+	branch = rustc-test/llvm-87190
 	shallow = true
 [submodule "src/doc/embedded-book"]
 	path = src/doc/embedded-book
diff --git a/src/llvm-project b/src/llvm-project
index c54cff0e6e4d1..1a947aa4a2d4b 160000
--- a/src/llvm-project
+++ b/src/llvm-project
@@ -1 +1 @@
-Subproject commit c54cff0e6e4d1a0d0a2df7c1ce3d96cdd554763e
+Subproject commit 1a947aa4a2d4b3a5af96aa1fb9f5bbf5a8a695db