diff --git a/infra/base-images/base-clang/checkout_build_install_llvm.sh b/infra/base-images/base-clang/checkout_build_install_llvm.sh
index f84df7191..c5d97d5bf 100755
--- a/infra/base-images/base-clang/checkout_build_install_llvm.sh
+++ b/infra/base-images/base-clang/checkout_build_install_llvm.sh
@@ -66,11 +66,11 @@ cd clang
 LLVM_SRC=$SRC/llvm-project
 
 # For manual bumping.
-OUR_LLVM_REVISION=1185d3f43d2186fa9291fe7779abf48d9b962ef4
+OUR_LLVM_REVISION=llvmorg-12-init-17251-g6de48655
 
 # To allow for manual downgrades. Set to 0 to use Chrome's clang version (i.e.
 # *not* force a manual downgrade). Set to 1 to force a manual downgrade.
-FORCE_OUR_REVISION=0
+FORCE_OUR_REVISION=1
 LLVM_REVISION=$(grep -Po "CLANG_REVISION = '\K([^']+)" scripts/update.py)
 
 clone_with_retries https://github.com/llvm/llvm-project.git $LLVM_SRC