diff --git a/hugegraph-dist/src/assembly/travis/install-cassandra.sh b/hugegraph-dist/src/assembly/travis/install-cassandra.sh
index 7df6f5d424..301dd868ea 100755
--- a/hugegraph-dist/src/assembly/travis/install-cassandra.sh
+++ b/hugegraph-dist/src/assembly/travis/install-cassandra.sh
@@ -4,7 +4,7 @@ set -ev
 
 TRAVIS_DIR=`dirname $0`
 CASSA_DOWNLOAD_ADDRESS="http://archive.apache.org/dist/cassandra"
-CASSA_VERSION="3.11.3"
+CASSA_VERSION="3.10"
 CASSA_PACKAGE="apache-cassandra-${CASSA_VERSION}"
 CASSA_TAR="${CASSA_PACKAGE}-bin.tar.gz"
 
diff --git a/hugegraph-scylladb/src/main/java/com/baidu/hugegraph/backend/store/scylladb/ScyllaDBStoreProvider.java b/hugegraph-scylladb/src/main/java/com/baidu/hugegraph/backend/store/scylladb/ScyllaDBStoreProvider.java
index 0aca4393e2..aac2e79a5d 100644
--- a/hugegraph-scylladb/src/main/java/com/baidu/hugegraph/backend/store/scylladb/ScyllaDBStoreProvider.java
+++ b/hugegraph-scylladb/src/main/java/com/baidu/hugegraph/backend/store/scylladb/ScyllaDBStoreProvider.java
@@ -32,10 +32,10 @@
 
 public class ScyllaDBStoreProvider extends CassandraStoreProvider {
 
-    private static final Logger LOG = Log.logger(CassandraStore.class);
-
     // TODO: read ScyllaDB version from conf
-    private static final int VERSION = 20;
+    public static int VERSION = 20;
+
+    private static final Logger LOG = Log.logger(CassandraStore.class);
 
     private static final BackendFeatures FEATURES = new ScyllaDBFeatures();