diff --git a/binders/kafka-binder/spring-cloud-stream-binder-kafka-core/src/test/java/org/springframework/cloud/stream/binder/kafka/properties/KafkaBinderConfigurationPropertiesTest.java b/binders/kafka-binder/spring-cloud-stream-binder-kafka-core/src/test/java/org/springframework/cloud/stream/binder/kafka/properties/KafkaBinderConfigurationPropertiesTest.java
index 4a36b03be..84102c2ac 100644
--- a/binders/kafka-binder/spring-cloud-stream-binder-kafka-core/src/test/java/org/springframework/cloud/stream/binder/kafka/properties/KafkaBinderConfigurationPropertiesTest.java
+++ b/binders/kafka-binder/spring-cloud-stream-binder-kafka-core/src/test/java/org/springframework/cloud/stream/binder/kafka/properties/KafkaBinderConfigurationPropertiesTest.java
@@ -1,5 +1,5 @@
 /*
- * Copyright 2018-2022 the original author or authors.
+ * Copyright 2018-2023 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -33,7 +33,7 @@ import org.springframework.core.io.ClassPathResource;
 
 import static org.assertj.core.api.Assertions.assertThat;
 
-public class KafkaBinderConfigurationPropertiesTest {
+class KafkaBinderConfigurationPropertiesTest {
 
 	@Test
 	public void mergedConsumerConfigurationFiltersGroupIdFromKafkaProperties() {
diff --git a/binders/kafka-binder/spring-cloud-stream-binder-kafka-core/src/test/java/org/springframework/cloud/stream/binder/kafka/provisioning/KafkaTopicProvisionerTests.java b/binders/kafka-binder/spring-cloud-stream-binder-kafka-core/src/test/java/org/springframework/cloud/stream/binder/kafka/provisioning/KafkaTopicProvisionerTests.java
index de2c8c17a..80758fb50 100644
--- a/binders/kafka-binder/spring-cloud-stream-binder-kafka-core/src/test/java/org/springframework/cloud/stream/binder/kafka/provisioning/KafkaTopicProvisionerTests.java
+++ b/binders/kafka-binder/spring-cloud-stream-binder-kafka-core/src/test/java/org/springframework/cloud/stream/binder/kafka/provisioning/KafkaTopicProvisionerTests.java
@@ -1,5 +1,5 @@
 /*
- * Copyright 2018-2022 the original author or authors.
+ * Copyright 2018-2023 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -40,7 +40,7 @@ import static org.assertj.core.api.Assertions.fail;
  * @since 2.0
  *
  */
-public class KafkaTopicProvisionerTests {
+class KafkaTopicProvisionerTests {
 
 	AdminClientConfigCustomizer adminClientConfigCustomizer = adminClientProperties -> adminClientProperties.put("foo", "bar");