diff --git a/go/store/hash/hash.go b/go/store/hash/hash.go
index e77d4572af4..630d54e0d82 100644
--- a/go/store/hash/hash.go
+++ b/go/store/hash/hash.go
@@ -47,9 +47,9 @@ package hash
 
 import (
 	"bytes"
-	"crypto/sha512"
 	"encoding/binary"
 	"fmt"
+	"github.com/zeebo/blake3"
 	"regexp"
 	"strconv"
 	"strings"
@@ -91,7 +91,7 @@ func (h Hash) String() string {
 
 // Of computes a new Hash from data.
 func Of(data []byte) Hash {
-	r := sha512.Sum512(data)
+	r := blake3.Sum512(data)
 	h := Hash{}
 	copy(h[:], r[:ByteLen])
 	return h
diff --git a/go/store/nbs/table.go b/go/store/nbs/table.go
index 0566503fa83..4512ce55189 100644
--- a/go/store/nbs/table.go
+++ b/go/store/nbs/table.go
@@ -23,7 +23,7 @@ package nbs
 
 import (
 	"context"
-	"crypto/sha512"
+	"github.com/zeebo/blake3"
 	"hash/crc32"
 	"io"
 	"maps"
@@ -146,7 +146,7 @@ func crc(b []byte) uint32 {
 }
 
 func computeHashDefault(data []byte) hash.Hash {
-	r := sha512.Sum512(data)
+	r := blake3.Sum512(data)
 	return hash.New(r[:hash.ByteLen])
 }