diff --git a/include/mcl/op.hpp b/include/mcl/op.hpp
index 954da95..7f15b99 100644
--- a/include/mcl/op.hpp
+++ b/include/mcl/op.hpp
@@ -26,7 +26,7 @@
 
 namespace mcl {
 
-static const int version = 0x139; /* 0xABC = A.BC */
+static const int version = 0x140; /* 0xABC = A.BC */
 
 /*
 	specifies available string format mode for X::setIoMode()
diff --git a/readme.md b/readme.md
index c41cb1b..1c8dab5 100644
--- a/readme.md
+++ b/readme.md
@@ -323,6 +323,7 @@ If `MCL_USE_OLD_MAPTO_FOR_BLS12` is defined, then the old function is used, but
 
 # History
 
+- 2021/May/24 v1.40 fix sigsegv in valgrind
 - 2021/Jan/28 v1.31 fix : call setOrder in init for isValidOrder
 - 2021/Jan/28 v1.30 a little optimization of Fp operations
 - 2020/Nov/14 v1.28 support M1 mac