diff --git a/validator/types/BUILD.bazel b/validator/types/BUILD.bazel
index a0d6a78ed3..8aa1728314 100644
--- a/validator/types/BUILD.bazel
+++ b/validator/types/BUILD.bazel
@@ -15,12 +15,12 @@ go_library(
         "//validator/params:go_default_library",
         "@com_github_ethereum_go_ethereum//common:go_default_library",
         "@com_github_ethereum_go_ethereum//core/types:go_default_library",
-        "@com_github_ethereum_go_ethereum//crypto/sha3:go_default_library",
         "@com_github_ethereum_go_ethereum//ethdb:go_default_library",
         "@com_github_ethereum_go_ethereum//rlp:go_default_library",
         "@com_github_sirupsen_logrus//:go_default_library",
         "@com_github_syndtr_goleveldb//leveldb/errors:go_default_library",
         "@com_github_urfave_cli//:go_default_library",
+        "@org_golang_x_crypto//blake2b:go_default_library",
     ],
 )
 
@@ -36,8 +36,8 @@ go_test(
         "//shared/shardutil:go_default_library",
         "@com_github_ethereum_go_ethereum//common:go_default_library",
         "@com_github_ethereum_go_ethereum//core/types:go_default_library",
-        "@com_github_ethereum_go_ethereum//crypto/sha3:go_default_library",
         "@com_github_ethereum_go_ethereum//ethdb:go_default_library",
         "@com_github_ethereum_go_ethereum//rlp:go_default_library",
+        "@org_golang_x_crypto//blake2b:go_default_library",
     ],
 )
diff --git a/validator/types/collation.go b/validator/types/collation.go
index 8da02ce6df..00fedb7c1a 100644
--- a/validator/types/collation.go
+++ b/validator/types/collation.go
@@ -7,10 +7,10 @@ import (
 
 	"github.com/ethereum/go-ethereum/common"
 	gethTypes "github.com/ethereum/go-ethereum/core/types"
-	"github.com/ethereum/go-ethereum/crypto/sha3"
 	"github.com/ethereum/go-ethereum/rlp"
 	"github.com/prysmaticlabs/prysm/shared/shardutil"
 	"github.com/prysmaticlabs/prysm/validator/params"
+	"golang.org/x/crypto/blake2b"
 )
 
 // Collation defines a base struct that serves as a primitive equivalent of a "block"
@@ -65,15 +65,14 @@ func NewCollationHeader(shardID *big.Int, chunkRoot *common.Hash, period *big.In
 	return &CollationHeader{data: data}
 }
 
-// Hash takes the keccak256 of the collation header's data contents.
+// Hash takes the blake2b of the collation header's data contents.
 func (h *CollationHeader) Hash() (hash common.Hash) {
-	hw := sha3.NewKeccak256()
-
-	if err := rlp.Encode(hw, h.data); err != nil {
+	encoded, err := rlp.EncodeToBytes(h.data)
+	if err != nil {
 		log.Errorf("Failed to RLP encode data: %v", err)
 	}
-
-	hw.Sum(hash[:0])
+	blakeHash := blake2b.Sum512(encoded)
+	copy(hash[:], blakeHash[:32])
 	return hash
 }
 
diff --git a/validator/types/shard_test.go b/validator/types/shard_test.go
index cddf007fed..285087eb77 100644
--- a/validator/types/shard_test.go
+++ b/validator/types/shard_test.go
@@ -8,10 +8,10 @@ import (
 
 	"github.com/ethereum/go-ethereum/common"
 	gethTypes "github.com/ethereum/go-ethereum/core/types"
-	"github.com/ethereum/go-ethereum/crypto/sha3"
 	"github.com/ethereum/go-ethereum/ethdb"
 	"github.com/ethereum/go-ethereum/rlp"
 	sharedDB "github.com/prysmaticlabs/prysm/shared/database"
+	"golang.org/x/crypto/blake2b"
 )
 
 type mockShardDB struct {
@@ -43,11 +43,15 @@ func (m *mockShardDB) NewBatch() ethdb.Batch {
 
 // Hash returns the hash of a collation's entire contents. Useful for comparison tests.
 func (c *Collation) Hash() (hash common.Hash) {
-	hw := sha3.NewKeccak256()
-	rlp.Encode(hw, c)
-	hw.Sum(hash[:0])
+	encoded, err := rlp.EncodeToBytes(c)
+	if err != nil {
+		log.Errorf("Failed to RLP encode data: %v", err)
+	}
+	blakeHash := blake2b.Sum512(encoded)
+	copy(hash[:], blakeHash[:32])
 	return hash
 }
+
 func TestShard_ValidateShardID(t *testing.T) {
 	emptyHash := common.BytesToHash([]byte{})
 	emptyAddr := common.BytesToAddress([]byte{})