diff --git a/CHANGELOG.md b/CHANGELOG.md
index f7ec759f9b..a96a851caf 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -5,6 +5,7 @@
 ### Improvements
 
 * (versiondb) [#1379](https://github.com/crypto-org-chain/cronos/pull/1379) Flush versiondb when graceful shutdown, make rocksdb upgrade smooth.
+* (versiondb) [#1491](https://github.com/crypto-org-chain/cronos/pull/1491) Free slice data in HasAtVersion.
 
 ### Bug Fixes
 
diff --git a/versiondb/tsrocksdb/store.go b/versiondb/tsrocksdb/store.go
index be34c74632..7d4176c5d0 100644
--- a/versiondb/tsrocksdb/store.go
+++ b/versiondb/tsrocksdb/store.go
@@ -108,6 +108,7 @@ func (s Store) HasAtVersion(storeKey string, key []byte, version *int64) (bool,
 	if err != nil {
 		return false, err
 	}
+	defer slice.Free()
 	return slice.Exists(), nil
 }