diff --git a/build.gradle b/build.gradle
index 03ed9c64985..a51f2eed9c1 100644
--- a/build.gradle
+++ b/build.gradle
@@ -6,7 +6,7 @@ plugins {
 	id 'com.github.bjornvester.xjc' version '1.8.2' apply false
 	id 'com.gradleup.shadow' version "9.2.2" apply false
 	id 'me.champeau.jmh' version '0.7.2' apply false
-	id 'io.spring.nullability' version '0.0.14' apply false
+	id 'io.spring.nullability' version '0.0.15' apply false
 }
 
 ext {
diff --git a/spring-context-support/src/main/java/org/springframework/scheduling/quartz/SimpleThreadPoolTaskExecutor.java b/spring-context-support/src/main/java/org/springframework/scheduling/quartz/SimpleThreadPoolTaskExecutor.java
index c94b70ee796..522c6b7a60a 100644
--- a/spring-context-support/src/main/java/org/springframework/scheduling/quartz/SimpleThreadPoolTaskExecutor.java
+++ b/spring-context-support/src/main/java/org/springframework/scheduling/quartz/SimpleThreadPoolTaskExecutor.java
@@ -20,6 +20,7 @@ import java.util.concurrent.Callable;
 import java.util.concurrent.Future;
 import java.util.concurrent.FutureTask;
 
+import org.jspecify.annotations.Nullable;
 import org.quartz.SchedulerConfigException;
 import org.quartz.simpl.SimpleThreadPool;
 
@@ -83,7 +84,7 @@ public class SimpleThreadPoolTaskExecutor extends SimpleThreadPool
 	}
 
 	@Override
-	public <T> Future<T> submit(Callable<T> task) {
+	public <T extends @Nullable Object> Future<T> submit(Callable<T> task) {
 		FutureTask<T> future = new FutureTask<>(task);
 		execute(future);
 		return future;
diff --git a/spring-context/src/main/java/org/springframework/scheduling/concurrent/ConcurrentTaskExecutor.java b/spring-context/src/main/java/org/springframework/scheduling/concurrent/ConcurrentTaskExecutor.java
index 7b15ed5e872..19c28bd3fa8 100644
--- a/spring-context/src/main/java/org/springframework/scheduling/concurrent/ConcurrentTaskExecutor.java
+++ b/spring-context/src/main/java/org/springframework/scheduling/concurrent/ConcurrentTaskExecutor.java
@@ -165,7 +165,7 @@ public class ConcurrentTaskExecutor implements AsyncTaskExecutor, SchedulingTask
 	}
 
 	@Override
-	public <T> Future<T> submit(Callable<T> task) {
+	public <T extends @Nullable Object> Future<T> submit(Callable<T> task) {
 		return this.adaptedExecutor.submit(task);
 	}
 
@@ -208,7 +208,7 @@ public class ConcurrentTaskExecutor implements AsyncTaskExecutor, SchedulingTask
 		}
 
 		@Override
-		public <T> Future<T> submit(Callable<T> task) {
+		public <T extends @Nullable Object> Future<T> submit(Callable<T> task) {
 			return super.submit(ManagedTaskBuilder.buildManagedTask(task, task.toString()));
 		}
 	}
diff --git a/spring-context/src/main/java/org/springframework/scheduling/concurrent/ConcurrentTaskScheduler.java b/spring-context/src/main/java/org/springframework/scheduling/concurrent/ConcurrentTaskScheduler.java
index da0202e316a..8dc4215d62c 100644
--- a/spring-context/src/main/java/org/springframework/scheduling/concurrent/ConcurrentTaskScheduler.java
+++ b/spring-context/src/main/java/org/springframework/scheduling/concurrent/ConcurrentTaskScheduler.java
@@ -211,7 +211,7 @@ public class ConcurrentTaskScheduler extends ConcurrentTaskExecutor implements T
 	}
 
 	@Override
-	public <T> Future<T> submit(Callable<T> task) {
+	public <T extends @Nullable Object> Future<T> submit(Callable<T> task) {
 		return super.submit(new DelegatingErrorHandlingCallable<>(task, this.errorHandler));
 	}
 
diff --git a/spring-context/src/main/java/org/springframework/scheduling/concurrent/SimpleAsyncTaskScheduler.java b/spring-context/src/main/java/org/springframework/scheduling/concurrent/SimpleAsyncTaskScheduler.java
index 7e050ef212e..9e5062a04ba 100644
--- a/spring-context/src/main/java/org/springframework/scheduling/concurrent/SimpleAsyncTaskScheduler.java
+++ b/spring-context/src/main/java/org/springframework/scheduling/concurrent/SimpleAsyncTaskScheduler.java
@@ -262,7 +262,7 @@ public class SimpleAsyncTaskScheduler extends SimpleAsyncTaskExecutor implements
 	}
 
 	@Override
-	public <T> Future<T> submit(Callable<T> task) {
+	public <T extends @Nullable Object> Future<T> submit(Callable<T> task) {
 		return super.submit(new DelegatingErrorHandlingCallable<>(task, this.errorHandler));
 	}
 
diff --git a/spring-context/src/main/java/org/springframework/scheduling/concurrent/ThreadPoolTaskExecutor.java b/spring-context/src/main/java/org/springframework/scheduling/concurrent/ThreadPoolTaskExecutor.java
index b798f3fbaa1..9af8a4e11a6 100644
--- a/spring-context/src/main/java/org/springframework/scheduling/concurrent/ThreadPoolTaskExecutor.java
+++ b/spring-context/src/main/java/org/springframework/scheduling/concurrent/ThreadPoolTaskExecutor.java
@@ -401,7 +401,7 @@ public class ThreadPoolTaskExecutor extends ExecutorConfigurationSupport
 	}
 
 	@Override
-	public <T> Future<T> submit(Callable<T> task) {
+	public <T extends @Nullable Object> Future<T> submit(Callable<T> task) {
 		ExecutorService executor = getThreadPoolExecutor();
 		try {
 			return executor.submit(task);
diff --git a/spring-context/src/main/java/org/springframework/scheduling/concurrent/ThreadPoolTaskScheduler.java b/spring-context/src/main/java/org/springframework/scheduling/concurrent/ThreadPoolTaskScheduler.java
index ad06bf052a6..9e9c8d075b2 100644
--- a/spring-context/src/main/java/org/springframework/scheduling/concurrent/ThreadPoolTaskScheduler.java
+++ b/spring-context/src/main/java/org/springframework/scheduling/concurrent/ThreadPoolTaskScheduler.java
@@ -336,7 +336,7 @@ public class ThreadPoolTaskScheduler extends ExecutorConfigurationSupport
 	}
 
 	@Override
-	public <T> Future<T> submit(Callable<T> task) {
+	public <T extends @Nullable Object> Future<T> submit(Callable<T> task) {
 		ExecutorService executor = getScheduledExecutor();
 		try {
 			return executor.submit(new DelegatingErrorHandlingCallable<>(task, this.errorHandler));
diff --git a/spring-core/src/main/java/org/springframework/core/convert/converter/ConvertingComparator.java b/spring-core/src/main/java/org/springframework/core/convert/converter/ConvertingComparator.java
index dcb489d5f61..36efadfec3e 100644
--- a/spring-core/src/main/java/org/springframework/core/convert/converter/ConvertingComparator.java
+++ b/spring-core/src/main/java/org/springframework/core/convert/converter/ConvertingComparator.java
@@ -69,6 +69,7 @@ public class ConvertingComparator<S, T extends @Nullable Object> implements Comp
 	 * @param conversionService the conversion service
 	 * @param targetType the target type
 	 */
+	@SuppressWarnings("NullAway") // Retain support for comparators that handle a null conversion result
 	public ConvertingComparator(
 			Comparator<T> comparator, ConversionService conversionService, Class<? extends T> targetType) {
 
diff --git a/spring-core/src/main/java/org/springframework/core/convert/support/CharacterToNumberFactory.java b/spring-core/src/main/java/org/springframework/core/convert/support/CharacterToNumberFactory.java
index ac88807a73c..c6be0277b8b 100644
--- a/spring-core/src/main/java/org/springframework/core/convert/support/CharacterToNumberFactory.java
+++ b/spring-core/src/main/java/org/springframework/core/convert/support/CharacterToNumberFactory.java
@@ -43,7 +43,7 @@ import org.springframework.util.NumberUtils;
 final class CharacterToNumberFactory implements ConverterFactory<Character, Number> {
 
 	@Override
-	public <T extends Number> Converter<Character, @Nullable T> getConverter(Class<T> targetType) {
+	public <T extends Number> Converter<Character, ? extends @Nullable T> getConverter(Class<T> targetType) {
 		return new CharacterToNumber<>(targetType);
 	}
 
diff --git a/spring-core/src/main/java/org/springframework/core/convert/support/NumberToNumberConverterFactory.java b/spring-core/src/main/java/org/springframework/core/convert/support/NumberToNumberConverterFactory.java
index abf200874e9..d8c9b230e44 100644
--- a/spring-core/src/main/java/org/springframework/core/convert/support/NumberToNumberConverterFactory.java
+++ b/spring-core/src/main/java/org/springframework/core/convert/support/NumberToNumberConverterFactory.java
@@ -45,7 +45,7 @@ import org.springframework.util.NumberUtils;
 final class NumberToNumberConverterFactory implements ConverterFactory<Number, Number>, ConditionalConverter {
 
 	@Override
-	public <T extends Number> Converter<Number, @Nullable T> getConverter(Class<T> targetType) {
+	public <T extends Number> Converter<Number, ? extends @Nullable T> getConverter(Class<T> targetType) {
 		return new NumberToNumber<>(targetType);
 	}
 
diff --git a/spring-core/src/main/java/org/springframework/core/task/SimpleAsyncTaskExecutor.java b/spring-core/src/main/java/org/springframework/core/task/SimpleAsyncTaskExecutor.java
index d09482040e5..e0ae6a917a6 100644
--- a/spring-core/src/main/java/org/springframework/core/task/SimpleAsyncTaskExecutor.java
+++ b/spring-core/src/main/java/org/springframework/core/task/SimpleAsyncTaskExecutor.java
@@ -345,7 +345,7 @@ public class SimpleAsyncTaskExecutor extends CustomizableThreadCreator
 
 	@SuppressWarnings("deprecation")
 	@Override
-	public <T> Future<T> submit(Callable<T> task) {
+	public <T extends @Nullable Object> Future<T> submit(Callable<T> task) {
 		FutureTask<T> future = new FutureTask<>(task);
 		execute(future, TIMEOUT_INDEFINITE);
 		return future;
diff --git a/spring-core/src/main/java/org/springframework/core/task/support/TaskExecutorAdapter.java b/spring-core/src/main/java/org/springframework/core/task/support/TaskExecutorAdapter.java
index b9a81cecf6a..38be515d885 100644
--- a/spring-core/src/main/java/org/springframework/core/task/support/TaskExecutorAdapter.java
+++ b/spring-core/src/main/java/org/springframework/core/task/support/TaskExecutorAdapter.java
@@ -113,7 +113,7 @@ public class TaskExecutorAdapter implements AsyncTaskExecutor {
 	}
 
 	@Override
-	public <T> Future<T> submit(Callable<T> task) {
+	public <T extends @Nullable Object> Future<T> submit(Callable<T> task) {
 		try {
 			if (this.taskDecorator == null &&
 					this.concurrentExecutor instanceof ExecutorService executorService) {
diff --git a/spring-core/src/main/java/org/springframework/util/LinkedCaseInsensitiveMap.java b/spring-core/src/main/java/org/springframework/util/LinkedCaseInsensitiveMap.java
index 438acd1d27d..b221ca9a265 100644
--- a/spring-core/src/main/java/org/springframework/util/LinkedCaseInsensitiveMap.java
+++ b/spring-core/src/main/java/org/springframework/util/LinkedCaseInsensitiveMap.java
@@ -48,7 +48,7 @@ import org.jspecify.annotations.Nullable;
  * @since 3.0
  * @param <V> the value type
  */
-public class LinkedCaseInsensitiveMap<V> implements Map<String, V>, Serializable, Cloneable {
+public class LinkedCaseInsensitiveMap<V extends @Nullable Object> implements Map<String, V>, Serializable, Cloneable {
 
 	@Serial
 	private static final long serialVersionUID = -1797561627545787622L;
diff --git a/spring-core/src/main/java/org/springframework/util/comparator/InstanceComparator.java b/spring-core/src/main/java/org/springframework/util/comparator/InstanceComparator.java
index b8e38381c49..1657d7cd1ba 100644
--- a/spring-core/src/main/java/org/springframework/util/comparator/InstanceComparator.java
+++ b/spring-core/src/main/java/org/springframework/util/comparator/InstanceComparator.java
@@ -37,7 +37,7 @@ import org.springframework.util.Assert;
  * @param <T> the type of objects that may be compared by this comparator
  * @see Comparator#thenComparing(Comparator)
  */
-public class InstanceComparator<T> implements Comparator<T> {
+public class InstanceComparator<T extends @Nullable Object> implements Comparator<T> {
 
 	private final Class<?>[] instanceOrder;
 
diff --git a/spring-jdbc/src/main/java/org/springframework/jdbc/core/JdbcTemplate.java b/spring-jdbc/src/main/java/org/springframework/jdbc/core/JdbcTemplate.java
index 0eec243d061..cd3c04cfcd2 100644
--- a/spring-jdbc/src/main/java/org/springframework/jdbc/core/JdbcTemplate.java
+++ b/spring-jdbc/src/main/java/org/springframework/jdbc/core/JdbcTemplate.java
@@ -502,7 +502,7 @@ public class JdbcTemplate extends JdbcAccessor implements JdbcOperations {
 	}
 
 	@Override
-	public <T> Stream<T> queryForStream(String sql, RowMapper<T> rowMapper) throws DataAccessException {
+	public <T extends @Nullable Object> Stream<T> queryForStream(String sql, RowMapper<T> rowMapper) throws DataAccessException {
 		class StreamStatementCallback implements StatementCallback<Stream<T>>, SqlProvider {
 			@Override
 			public Stream<T> doInStatement(Statement stmt) throws SQLException {
diff --git a/spring-jdbc/src/main/java/org/springframework/jdbc/core/namedparam/NamedParameterJdbcTemplate.java b/spring-jdbc/src/main/java/org/springframework/jdbc/core/namedparam/NamedParameterJdbcTemplate.java
index db76fa820de..68ac7af95f6 100644
--- a/spring-jdbc/src/main/java/org/springframework/jdbc/core/namedparam/NamedParameterJdbcTemplate.java
+++ b/spring-jdbc/src/main/java/org/springframework/jdbc/core/namedparam/NamedParameterJdbcTemplate.java
@@ -232,7 +232,7 @@ public class NamedParameterJdbcTemplate implements NamedParameterJdbcOperations
 	}
 
 	@Override
-	public <T> List<T> query(String sql, RowMapper<T> rowMapper) throws DataAccessException {
+	public <T extends @Nullable Object> List<T> query(String sql, RowMapper<T> rowMapper) throws DataAccessException {
 		return query(sql, EmptySqlParameterSource.INSTANCE, rowMapper);
 	}
 
diff --git a/spring-test/src/main/java/org/springframework/test/web/reactive/server/DefaultWebTestClient.java b/spring-test/src/main/java/org/springframework/test/web/reactive/server/DefaultWebTestClient.java
index 5109efe2ef5..af645f0a8b8 100644
--- a/spring-test/src/main/java/org/springframework/test/web/reactive/server/DefaultWebTestClient.java
+++ b/spring-test/src/main/java/org/springframework/test/web/reactive/server/DefaultWebTestClient.java
@@ -487,12 +487,12 @@ class DefaultWebTestClient implements WebTestClient {
 		}
 
 		@Override
-		public <E> ListBodySpec<E> expectBodyList(Class<E> elementType) {
+		public <E extends @Nullable Object> ListBodySpec<E> expectBodyList(Class<E> elementType) {
 			return getListBodySpec(this.response.bodyToFlux(elementType));
 		}
 
 		@Override
-		public <E> ListBodySpec<E> expectBodyList(ParameterizedTypeReference<E> elementType) {
+		public <E extends @Nullable Object> ListBodySpec<E> expectBodyList(ParameterizedTypeReference<E> elementType) {
 			Flux<E> flux = this.response.bodyToFlux(elementType);
 			return getListBodySpec(flux);
 		}