diff --git a/include/mcl/op.hpp b/include/mcl/op.hpp
index 947cc245..e43a41a9 100644
--- a/include/mcl/op.hpp
+++ b/include/mcl/op.hpp
@@ -29,7 +29,7 @@
 
 namespace mcl {
 
-static const int version = 0x186; /* 0xABC = A.BC */
+static const int version = 0x187; /* 0xABC = A.BC */
 
 /*
 	specifies available string format mode for X::setIoMode()
diff --git a/readme.md b/readme.md
index cdf35125..d152b2e8 100644
--- a/readme.md
+++ b/readme.md
@@ -10,6 +10,7 @@ mcl is a library for pairing-based cryptography,
 which supports the optimal Ate pairing over BN curves and BLS12-381 curves.
 
 # News
+- a little performance improvement of G1::mulVec of BLS12-381
 - improve performance of Fr::inv on M1 mac
 - add mcl::bn::isValidGT(x) and mclBnGT_isValid(x) to check x in GT for x in Fp12.
 - support BN\_P256 (hash-to-curve is not yet standard way.)