diff --git a/.gitmodules b/.gitmodules
index f5025097a18..9bb68b37081 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/17.0-2023-09-19
+	branch = rustc/17.0-2023-12-14
 	shallow = true
 [submodule "src/doc/embedded-book"]
 	path = src/doc/embedded-book
diff --git a/src/llvm-project b/src/llvm-project
index 77382951780..17a687b23d2 160000
--- a/src/llvm-project
+++ b/src/llvm-project
@@ -1 +1 @@
-Subproject commit 7738295178045041669876bf32b0543ec8319a5c
+Subproject commit 17a687b23d22332fce6ba0aade180a30d06cfa62