diff --git a/ci/scripts/e2e-test-serial.sh b/ci/scripts/e2e-test-serial.sh
index 89727ba20f0b7..968d17eaeced3 100755
--- a/ci/scripts/e2e-test-serial.sh
+++ b/ci/scripts/e2e-test-serial.sh
@@ -48,7 +48,7 @@ cluster_start() {
     risedev pre-start-dev
     start_single_node "$PREFIX_LOG"/single-node.log &
     # Give it a while to make sure the single-node is ready.
-    sleep 15
+    sleep 30
   else
     risedev ci-start "$mode"
   fi