diff --git a/.gitmodules b/.gitmodules
index 2082ec9ef45..33ea0f53cf1 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/19.1-2024-07-30
+	branch = rustc/19.1-2024-09-17
 	shallow = true
 [submodule "src/doc/embedded-book"]
 	path = src/doc/embedded-book
diff --git a/src/llvm-project b/src/llvm-project
index 4b8d29c5856..56997739365 160000
--- a/src/llvm-project
+++ b/src/llvm-project
@@ -1 +1 @@
-Subproject commit 4b8d29c585687084bbcf21471e04f279d1eddc0a
+Subproject commit 56997739365e8132cc817e00899480746c09d7d9