diff --git a/README.md b/README.md
index 3ed340612..ae624d84a 100644
--- a/README.md
+++ b/README.md
@@ -6,7 +6,7 @@ Ethereum
 Ethereum Go Development package (C) Jeffrey Wilcke
 
 Ethereum is currently in its testing phase. The current state is "Proof
-of Concept 0.6.3". For build instructions see the [Wiki](https://github.com/ethereum/go-ethereum/wiki/Building-Ethereum(Go)).
+of Concept 0.6.4". For build instructions see the [Wiki](https://github.com/ethereum/go-ethereum/wiki/Building-Ethereum(Go)).
 
 Ethereum Go is split up in several sub packages Please refer to each
 individual package for more information.
diff --git a/ethvm/types.go b/ethvm/types.go
index 98fd8fba0..36ba395d6 100644
--- a/ethvm/types.go
+++ b/ethvm/types.go
@@ -59,9 +59,9 @@ const (
 	GASLIMIT   = 0x45
 
 	// 0x50 range - 'storage' and execution
-	POP     = 0x50
-	DUP     = 0x51
-	SWAP    = 0x52
+	POP = 0x50
+	//DUP     = 0x51
+	//SWAP    = 0x52
 	MLOAD   = 0x53
 	MSTORE  = 0x54
 	MSTORE8 = 0x55
@@ -204,9 +204,9 @@ var opCodeToString = map[OpCode]string{
 	GASLIMIT:   "GASLIMIT",
 
 	// 0x50 range - 'storage' and execution
-	POP:     "POP",
-	DUP:     "DUP",
-	SWAP:    "SWAP",
+	POP: "POP",
+	//DUP:     "DUP",
+	//SWAP:    "SWAP",
 	MLOAD:   "MLOAD",
 	MSTORE:  "MSTORE",
 	MSTORE8: "MSTORE8",
diff --git a/ethvm/vm.go b/ethvm/vm.go
index 29dc2515c..873a80c44 100644
--- a/ethvm/vm.go
+++ b/ethvm/vm.go
@@ -640,10 +640,6 @@ func (self *Vm) RunClosure(closure *Closure) (ret []byte, err error) {
 			x, y := stack.Swapn(n)
 
 			self.Printf(" => [%d] %x [0] %x", n, x.Bytes(), y.Bytes())
-		case DUP:
-			// NOP
-		case SWAP:
-			// NOP
 		case MLOAD:
 			require(1)
 			offset := stack.Pop()