diff --git a/src/CMakeLists.txt b/src/CMakeLists.txt
index 3497c61b60f8..a76da360c872 100644
--- a/src/CMakeLists.txt
+++ b/src/CMakeLists.txt
@@ -63,8 +63,9 @@ add_third_party(
 
 add_third_party(
   reflex
-  URL https://github.com/Genivia/RE-flex/archive/refs/tags/v3.5.1.tar.gz
-  CONFIGURE_COMMAND <SOURCE_DIR>/configure --disable-avx --prefix=${THIRD_PARTY_LIB_DIR}/reflex
+  URL https://github.com/Genivia/RE-flex/archive/refs/tags/v5.1.0.tar.gz
+  PATCH_COMMAND autoreconf -fi
+  CONFIGURE_COMMAND <SOURCE_DIR>/configure --disable-avx2 --prefix=${THIRD_PARTY_LIB_DIR}/reflex
           CXX=${CMAKE_CXX_COMPILER} CC=${CMAKE_C_COMPILER}
 )