diff --git a/build-llvm.sh b/build-llvm.sh
index 10bc868..73c4264 100755
--- a/build-llvm.sh
+++ b/build-llvm.sh
@@ -16,7 +16,7 @@
 
 set -e
 
-: ${LLVM_VERSION:=llvmorg-20.1.8}
+: ${LLVM_VERSION:=llvmorg-21.1.0-rc1}
 ASSERTS=OFF
 unset HOST
 BUILDDIR="build"