graphql-java
diff --git a/src/main/java/graphql/schema/DataFetchingEnvironment.java b/src/main/java/graphql/schema/DataFetchingEnvironment.java
@@ -238,7 +238,7 @@ public interface DataFetchingEnvironment extends IntrospectionDataFetchingEnviro
      * @see org.dataloader.DataLoaderRegistry#getDataLoader(String)
      */
     @Nullable
-    <K, V> DataLoader<K, V> getDataLoader(String dataLoaderName);
+    <K, V extends @Nullable Object> DataLoader<K, V> getDataLoader(String dataLoaderName);
 
 
     /**

diff --git a/src/main/java/graphql/schema/DataFetchingEnvironmentImpl.java b/src/main/java/graphql/schema/DataFetchingEnvironmentImpl.java
@@ -230,7 +230,7 @@ public ExecutionStepInfo getExecutionStepInfo() {
 
 
     @Override
-    public <K, V> @Nullable DataLoader<K, V> getDataLoader(String dataLoaderName) {
+    public <K, V extends @Nullable Object> @Nullable DataLoader<K, V> getDataLoader(String dataLoaderName) {
         DataLoader<K, V> dataLoader = dataLoaderRegistry.getDataLoader(dataLoaderName);
         if (dataLoader == null) {
             return null;

diff --git a/src/main/java/graphql/schema/DelegatingDataFetchingEnvironment.java b/src/main/java/graphql/schema/DelegatingDataFetchingEnvironment.java
@@ -148,7 +148,7 @@ public QueryDirectives getQueryDirectives() {
     }
 
     @Override
-    public <K, V> @Nullable DataLoader<K, V> getDataLoader(String dataLoaderName) {
+    public <K, V extends @Nullable Object> @Nullable DataLoader<K, V> getDataLoader(String dataLoaderName) {
         return delegateEnvironment.getDataLoader(dataLoaderName);
     }