diff --git a/readme.md b/readme.md
index 2831869..1f50539 100644
--- a/readme.md
+++ b/readme.md
@@ -1,5 +1,5 @@
 
-Xbyak 5.30 ; JIT assembler for x86(IA32), x64(AMD64, x86-64) by C++
+Xbyak 5.31 ; JIT assembler for x86(IA32), x64(AMD64, x86-64) by C++
 =============
 
 Abstract
@@ -323,6 +323,7 @@
 
 History
 -------------
+* 2016/Nov/27 ver 5.31 rename AVX512_4VNNI to AVX512_4VNNIW
 * 2016/Nov/27 ver 5.30 add AVX512_4VNNI, AVX512_4FMAPS instructions(thanks to rsdubtso)
 * 2016/Nov/26 ver 5.20 add detection of AVX512_4VNNI and AVX512_4FMAPS(thanks to rsdubtso)
 * 2016/Nov/20 ver 5.11 lost vptest for ymm(thanks to gregory38)
diff --git a/readme.txt b/readme.txt
index 60e1dae..3d9c501 100644
--- a/readme.txt
+++ b/readme.txt
@@ -1,5 +1,5 @@
 
-    C++用x86(IA-32), x64(AMD64, x86-64) JITアセンブラ Xbyak 5.20
+    C++用x86(IA-32), x64(AMD64, x86-64) JITアセンブラ Xbyak 5.31
 
 -----------------------------------------------------------------------------
 ◎概要
@@ -333,6 +333,7 @@
 -----------------------------------------------------------------------------
 ◎履歴
 
+2016/11/27 ver 5.31 AVX512_4VNNIをAVX512_4VNNIWに変更
 2016/11/27 ver 5.30 AVX512_4VNNI, AVX512_4FMAPS命令の追加(thanks to rsdubtso)
 2016/11/26 ver 5.20 AVX512_4VNNIとAVX512_4FMAPSの判定追加(thanks to rsdubtso)
 2016/11/20 ver 5.11 何故か消えていたvptest for ymm追加(thanks to gregory38)
diff --git a/sample/test_util.cpp b/sample/test_util.cpp
index dd19b52..86cdad9 100644
--- a/sample/test_util.cpp
+++ b/sample/test_util.cpp
@@ -64,7 +64,7 @@
 		{ Cpu::tAVX512BW, "avx512bw" },
 		{ Cpu::tAVX512VL, "avx512vl" },
 		{ Cpu::tAVX512VBMI, "avx512vbmi" },
-		{ Cpu::tAVX512_4VNNI, "avx512_4vnni" },
+		{ Cpu::tAVX512_4VNNIW, "avx512_4vnniw" },
 		{ Cpu::tAVX512_4FMAPS, "avx512_4fmaps" },
 	};
 	for (size_t i = 0; i < NUM_OF_ARRAY(tbl); i++) {
diff --git a/xbyak/xbyak.h b/xbyak/xbyak.h
index c261102..32bb9c1 100644
--- a/xbyak/xbyak.h
+++ b/xbyak/xbyak.h
@@ -105,7 +105,7 @@
 
 enum {
 	DEFAULT_MAX_CODE_SIZE = 4096,
-	VERSION = 0x5300 /* 0xABCD = A.BC(D) */
+	VERSION = 0x5310 /* 0xABCD = A.BC(D) */
 };
 
 #ifndef MIE_INTEGER_TYPE_DEFINED
diff --git a/xbyak/xbyak_mnemonic.h b/xbyak/xbyak_mnemonic.h
index 8af6d50..2fb71a0 100644
--- a/xbyak/xbyak_mnemonic.h
+++ b/xbyak/xbyak_mnemonic.h
@@ -1,4 +1,4 @@
-const char *getVersionString() const { return "5.30"; }
+const char *getVersionString() const { return "5.31"; }
 void adc(const Operand& op, uint32 imm) { opRM_I(op, imm, 0x10, 2); }
 void adc(const Operand& op1, const Operand& op2) { opRM_RM(op1, op2, 0x10); }
 void adcx(const Reg32e& reg, const Operand& op) { opGen(reg, op, 0xF6, 0x66, isREG32_REG32orMEM, NONE, 0x38); }
diff --git a/xbyak/xbyak_util.h b/xbyak/xbyak_util.h
index 30aece1..6040087 100644
--- a/xbyak/xbyak_util.h
+++ b/xbyak/xbyak_util.h
@@ -176,7 +176,7 @@
 	static const Type tAVX512BW = uint64(1) << 41;
 	static const Type tAVX512VL = uint64(1) << 42;
 	static const Type tAVX512VBMI = uint64(1) << 43;
-	static const Type tAVX512_4VNNI = uint64(1) << 44;
+	static const Type tAVX512_4VNNIW = uint64(1) << 44;
 	static const Type tAVX512_4FMAPS = uint64(1) << 45;
 
 	Cpu()
@@ -238,7 +238,7 @@
 						if (data[1] & (1U << 30)) type_ |= tAVX512BW;
 						if (data[1] & (1U << 31)) type_ |= tAVX512VL;
 						if (data[2] & (1U << 1)) type_ |= tAVX512VBMI;
-						if (data[3] & (1U << 2)) type_ |= tAVX512_4VNNI;
+						if (data[3] & (1U << 2)) type_ |= tAVX512_4VNNIW;
 						if (data[3] & (1U << 3)) type_ |= tAVX512_4FMAPS;
 					}
 				}