diff --git a/spring-data-jpa/src/main/java/org/springframework/data/jpa/domain/Specification.java b/spring-data-jpa/src/main/java/org/springframework/data/jpa/domain/Specification.java
index 3f4fc3640..4586bf76f 100644
--- a/spring-data-jpa/src/main/java/org/springframework/data/jpa/domain/Specification.java
+++ b/spring-data-jpa/src/main/java/org/springframework/data/jpa/domain/Specification.java
@@ -39,6 +39,7 @@ import org.springframework.lang.Nullable;
  * @author Daniel Shuy
  * @author Sergey Rukin
  */
+@FunctionalInterface
 public interface Specification<T> extends Serializable {
 
 	@Serial long serialVersionUID = 1L;
diff --git a/spring-data-jpa/src/test/java/org/springframework/data/jpa/domain/SpecificationUnitTests.java b/spring-data-jpa/src/test/java/org/springframework/data/jpa/domain/SpecificationUnitTests.java
index 96f193b42..11e4a479f 100644
--- a/spring-data-jpa/src/test/java/org/springframework/data/jpa/domain/SpecificationUnitTests.java
+++ b/spring-data-jpa/src/test/java/org/springframework/data/jpa/domain/SpecificationUnitTests.java
@@ -46,10 +46,9 @@ import org.mockito.quality.Strictness;
  * @author Mark Paluch
  * @author Daniel Shuy
  */
-@SuppressWarnings("serial")
 @ExtendWith(MockitoExtension.class)
 @MockitoSettings(strictness = Strictness.LENIENT)
-class SpecificationUnitTests implements Serializable {
+class SpecificationUnitTests {
 
 	private Specification<Object> spec;
 	@Mock(serializable = true) Root<Object> root;
@@ -163,7 +162,7 @@ class SpecificationUnitTests implements Serializable {
 
 		assertThat(specification).isNotNull();
 
-		@SuppressWarnings("unchecked")
+		@SuppressWarnings({"unchecked", "deprecation"})
 		Specification<Object> transferredSpecification = (Specification<Object>) deserialize(serialize(specification));
 
 		assertThat(transferredSpecification).isNotNull();
@@ -178,7 +177,7 @@ class SpecificationUnitTests implements Serializable {
 
 		assertThat(specification).isNotNull();
 
-		@SuppressWarnings("unchecked")
+		@SuppressWarnings({"unchecked", "deprecation"})
 		Specification<Object> transferredSpecification = (Specification<Object>) deserialize(serialize(specification));
 
 		assertThat(transferredSpecification).isNotNull();