diff --git a/avatar-realm-resource/pom.xml b/avatar-realm-resource/pom.xml
index 7dc79c3..4525fc2 100644
--- a/avatar-realm-resource/pom.xml
+++ b/avatar-realm-resource/pom.xml
@@ -33,6 +33,10 @@
 			<version>${project.version}</version>
 			<scope>provided</scope>
 		</dependency>
+		<dependency>
+			<groupId>io.quarkus</groupId>
+			<artifactId>quarkus-resteasy-reactive</artifactId>
+		</dependency>
 		<dependency>
 			<groupId>io.minio</groupId>
 			<artifactId>minio</artifactId>
diff --git a/avatar-realm-resource/src/main/java/org/gcube/keycloak/avatar/AvatarAdminResource.java b/avatar-realm-resource/src/main/java/org/gcube/keycloak/avatar/AvatarAdminResource.java
index a6c66ff..3121591 100644
--- a/avatar-realm-resource/src/main/java/org/gcube/keycloak/avatar/AvatarAdminResource.java
+++ b/avatar-realm-resource/src/main/java/org/gcube/keycloak/avatar/AvatarAdminResource.java
@@ -1,10 +1,11 @@
 package org.gcube.keycloak.avatar;
 
-import java.io.InputStream;
+import java.nio.file.Files;
 
 import org.gcube.keycloak.avatar.storage.AvatarStorageProvider;
 import org.jboss.resteasy.annotations.cache.NoCache;
-import org.jboss.resteasy.plugins.providers.multipart.MultipartFormDataInput;
+import org.jboss.resteasy.reactive.RestForm;
+import org.jboss.resteasy.reactive.multipart.FileUpload;
 import org.keycloak.common.ClientConnection;
 import org.keycloak.models.KeycloakSession;
 import org.keycloak.models.RealmModel;
@@ -62,7 +63,7 @@ public class AvatarAdminResource extends AbstractAvatarResource {
     @NoCache
     @Path("/{user_id}")
     @Consumes(MediaType.MULTIPART_FORM_DATA)
-    public Response uploadUserAvatarImage(@PathParam("user_id") String userId, MultipartFormDataInput input) {
+    public Response uploadUserAvatarImage(@PathParam("user_id") String userId,  @RestForm(AVATAR_IMAGE_PARAMETER) FileUpload image) {
         try {
             if (auth == null) {
                 return Response.status(Response.Status.UNAUTHORIZED).build();
@@ -71,8 +72,7 @@ public class AvatarAdminResource extends AbstractAvatarResource {
             RealmModel realm = session.getContext().getRealm();
             UserModel user = session.users().getUserById(session.getContext().getRealm(), userId);
 
-            InputStream imageInputStream = input.getFormDataPart(AVATAR_IMAGE_PARAMETER, InputStream.class, null);
-            saveUserImage(realm, user, imageInputStream);
+            saveUserImage(realm, user, Files.newInputStream(image.uploadedFile()));
         } catch (ForbiddenException e) {
             return Response.status(Response.Status.FORBIDDEN).entity(e.getMessage()).build();
         } catch (Exception e) {
diff --git a/avatar-realm-resource/src/main/java/org/gcube/keycloak/avatar/AvatarResource.java b/avatar-realm-resource/src/main/java/org/gcube/keycloak/avatar/AvatarResource.java
index 4bb907c..c4a7122 100644
--- a/avatar-realm-resource/src/main/java/org/gcube/keycloak/avatar/AvatarResource.java
+++ b/avatar-realm-resource/src/main/java/org/gcube/keycloak/avatar/AvatarResource.java
@@ -1,14 +1,15 @@
 package org.gcube.keycloak.avatar;
 
-import java.io.InputStream;
+import java.nio.file.Files;
 import java.util.List;
 
 import org.jboss.resteasy.annotations.cache.NoCache;
-import org.jboss.resteasy.plugins.providers.multipart.MultipartFormDataInput;
+import org.jboss.resteasy.reactive.RestForm;
+import org.jboss.resteasy.reactive.multipart.FileUpload;
 import org.jboss.resteasy.spi.ResteasyProviderFactory;
 import org.keycloak.http.HttpRequest;
 import org.keycloak.models.KeycloakSession;
-import org.keycloak.services.resources.Cors;
+import org.keycloak.services.cors.Cors;
 import org.keycloak.services.resources.RealmsResource;
 
 import jakarta.ws.rs.Consumes;
@@ -74,7 +75,7 @@ public class AvatarResource extends AbstractAvatarResource {
     @POST
     @NoCache
     @Consumes(MediaType.MULTIPART_FORM_DATA)
-    public Response uploadCurrentUserAvatarImage(MultipartFormDataInput input, @Context UriInfo uriInfo) {
+    public Response uploadCurrentUserAvatarImage(@RestForm(AVATAR_IMAGE_PARAMETER) FileUpload image, @Context UriInfo uriInfo) {
         if (auth == null) {
             throw new NotAuthorizedException("Bearer");
         }
@@ -86,9 +87,7 @@ public class AvatarResource extends AbstractAvatarResource {
         logger.debugf("Uploading new avatar for user %s in realm %s", auth.getUser(), auth.getSession().getRealm());
         Response response = null;
         try {
-            InputStream imageInputStream = input.getFormDataPart(AVATAR_IMAGE_PARAMETER, InputStream.class, null);
-
-            saveUserImage(auth.getSession().getRealm(), auth.getUser(), imageInputStream);
+            saveUserImage(auth.getSession().getRealm(), auth.getUser(), Files.newInputStream(image.uploadedFile()));
 
             if (uriInfo.getQueryParameters().containsKey("account")) {
                 UriBuilder uriBuilder = RealmsResource.accountUrl(session.getContext().getUri().getBaseUriBuilder());