diff --git a/boot-opensearch-sample/src/test/java/com/example/opensearch/common/ContainersConfig.java b/boot-opensearch-sample/src/test/java/com/example/opensearch/common/ContainersConfig.java
index c84516fb2..64ddbcdc2 100644
--- a/boot-opensearch-sample/src/test/java/com/example/opensearch/common/ContainersConfig.java
+++ b/boot-opensearch-sample/src/test/java/com/example/opensearch/common/ContainersConfig.java
@@ -9,8 +9,8 @@
 public class ContainersConfig {
 
     @Container
-    public static OpensearchContainer openSearchContainer =
-            new OpensearchContainer(DockerImageName.parse("opensearchproject/opensearch:2.11.0"));
+    public static OpensearchContainer<?> openSearchContainer =
+            new OpensearchContainer<>(DockerImageName.parse("opensearchproject/opensearch:2.11.0"));
 
     static {
         openSearchContainer.start();