diff --git a/.gitmodules b/.gitmodules
index 802d61eea29..75faaba7151 100644
--- a/.gitmodules
+++ b/.gitmodules
@@ -33,7 +33,7 @@
 [submodule "src/llvm-project"]
 	path = src/llvm-project
 	url = https://github.com/rust-lang/llvm-project.git
-	branch = rustc/18.0-2024-02-13
+	branch = rustc/18.1-2024-05-19
 	shallow = true
 [submodule "src/doc/embedded-book"]
 	path = src/doc/embedded-book
diff --git a/src/llvm-project b/src/llvm-project
index 5399a24c66c..b31c30a9bb4 160000
--- a/src/llvm-project
+++ b/src/llvm-project
@@ -1 +1 @@
-Subproject commit 5399a24c66cb6164cf32280e7d300488c90d5765
+Subproject commit b31c30a9bb4dbbd13c359d0e2bea7f65d20adf3f