--- a/Tools/jit/_llvm.py	2025-04-09 09:06:26.989472956 +0700
+++ b/Tools/jit/_llvm.py	2025-04-09 09:06:41.490569826 +0700
@@ -8,7 +8,7 @@
 import subprocess
 import typing
 
-_LLVM_VERSION = 18
+_LLVM_VERSION = 21
 _LLVM_VERSION_PATTERN = re.compile(rf"version\s+{_LLVM_VERSION}\.\d+\.\d+\S*\s+")
 
 _P = typing.ParamSpec("_P")