diff --git a/CMakeLists.txt b/CMakeLists.txt
index e4a27ed1e..83a0ccebb 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -84,7 +84,7 @@ if (NOT WIN32)
 endif()
 if(C3_WITH_LLVM)
     if (NOT C3_LLVM_VERSION STREQUAL "auto")
-        if (${C3_LLVM_VERSION} VERSION_LESS 17 OR ${C3_LLVM_VERSION} VERSION_GREATER 20)
+        if (${C3_LLVM_VERSION} VERSION_LESS 17 OR ${C3_LLVM_VERSION} VERSION_GREATER 21)
             message(FATAL_ERROR "LLVM ${C3_LLVM_VERSION} is not supported!")
         endif()
     endif()