diff --git a/src/types.h b/src/types.h
index 5bf9af84..8e1fff95 100644
--- a/src/types.h
+++ b/src/types.h
@@ -2,7 +2,7 @@
 
 #include <cstdint>
 
-#define NAME "Alexandria-5.0.20"
+#define NAME "Alexandria-5.0.21"
 
 // define bitboard data type
 using Bitboard = uint64_t;