diff --git a/Godeps/Godeps.json b/Godeps/Godeps.json
index 0cdb4b0269..b97dec91f1 100644
--- a/Godeps/Godeps.json
+++ b/Godeps/Godeps.json
@@ -22,8 +22,8 @@
 		},
 		{
 			"ImportPath": "github.com/ethereum/ethash",
-			"Comment": "v23.1-25-gc0429f2",
-			"Rev": "c0429f268b62e2238b684d4b5495f8ff24115424"
+			"Comment": "v23.1-26-g934bb4f",
+			"Rev": "934bb4f5060ab69d96fb6eba4b9a57facc4e160b"
 		},
 		{
 			"ImportPath": "github.com/ethereum/serpent-go",
diff --git a/Godeps/_workspace/src/github.com/ethereum/ethash/ethash.go b/Godeps/_workspace/src/github.com/ethereum/ethash/ethash.go
index 8c325d25d9..3c24fd2391 100644
--- a/Godeps/_workspace/src/github.com/ethereum/ethash/ethash.go
+++ b/Godeps/_workspace/src/github.com/ethereum/ethash/ethash.go
@@ -85,7 +85,7 @@ func makeParamsAndCache(chainManager pow.ChainManager, blockNum uint64) (*Params
 		Epoch:  blockNum / epochLength,
 	}
 	C.ethash_params_init(paramsAndCache.params, C.uint32_t(uint32(blockNum)))
-	paramsAndCache.cache.mem = C.malloc(paramsAndCache.params.cache_size)
+	paramsAndCache.cache.mem = C.malloc(C.size_t(paramsAndCache.params.cache_size))
 
 	seedHash, err := GetSeedHash(blockNum)
 	if err != nil {
@@ -118,7 +118,7 @@ func (pow *Ethash) UpdateCache(force bool) error {
 
 func makeDAG(p *ParamsAndCache) *DAG {
 	d := &DAG{
-		dag:            C.malloc(p.params.full_size),
+		dag:            C.malloc(C.size_t(p.params.full_size)),
 		file:           false,
 		paramsAndCache: p,
 	}