diff --git a/.gitmodules b/.gitmodules
index 31db0772cfb..62cbbdd9a3a 100644
--- a/.gitmodules
+++ b/.gitmodules
@@ -40,7 +40,7 @@
 [submodule "src/llvm-project"]
 	path = src/llvm-project
 	url = https://github.com/rust-lang/llvm-project.git
-	branch = rustc/9.0-2019-09-19
+	branch = rustc/9.0-2019-12-19
 [submodule "src/doc/embedded-book"]
 	path = src/doc/embedded-book
 	url = https://github.com/rust-embedded/book.git
diff --git a/src/llvm-project b/src/llvm-project
index 9330ec5a4c1..cd87134ab77 160000
--- a/src/llvm-project
+++ b/src/llvm-project
@@ -1 +1 @@
-Subproject commit 9330ec5a4c1df5fc1fa62f993ed6a04da68cb040
+Subproject commit cd87134ab77e6bacb2128137065b328b9c35e0e5