diff --git a/Godeps/Godeps.json b/Godeps/Godeps.json
index 22da157861..9a4a5d3013 100644
--- a/Godeps/Godeps.json
+++ b/Godeps/Godeps.json
@@ -17,8 +17,8 @@
 		},
 		{
 			"ImportPath": "github.com/ethereum/ethash",
-			"Comment": "v23.1-206-gec7e3ba",
-			"Rev": "ec7e3ba99c7236902722b64aa89bc752fc67ba72"
+			"Comment": "v23.1-207-gac7a2d1",
+			"Rev": "ac7a2d1d57e7fd655636496b6df3c517d18e8734"
 		},
 		{
 			"ImportPath": "github.com/howeyc/fsnotify",
diff --git a/Godeps/_workspace/src/github.com/ethereum/ethash/ethash.go b/Godeps/_workspace/src/github.com/ethereum/ethash/ethash.go
index 6c4d33095b..2d0c024c9d 100644
--- a/Godeps/_workspace/src/github.com/ethereum/ethash/ethash.go
+++ b/Godeps/_workspace/src/github.com/ethereum/ethash/ethash.go
@@ -18,6 +18,7 @@ import (
 	"path/filepath"
 	"runtime"
 	"sync"
+	"sync/atomic"
 	"time"
 	"unsafe"
 
@@ -280,7 +281,7 @@ func (pow *Full) Search(block pow.Block, stop <-chan struct{}, prevHashRate *uin
 			if (i % (1 << 14)) == 0 { // we don't have to update hash rate on every nonce
 				elapsed := time.Now().UnixNano() - start
 				hashes := (float64(1e9) / float64(elapsed)) * float64(i-starti)
-				*prevHashRate = uint64(hashes)
+				atomic.StoreUint64(prevHashRate, uint64(hashes))
 			}
 
 			ret := C.ethash_full_compute(dag.ptr, hash, C.uint64_t(nonce))