diff --git a/CHANGES/446.bugfix b/CHANGES/446.bugfix
new file mode 100644
index 000000000..fe471e118
--- /dev/null
+++ b/CHANGES/446.bugfix
@@ -0,0 +1,2 @@
+Changed the use of ``dispatch`` to match the signature from pulpcore>=3.15.
+(backported from #443)
diff --git a/pulp_python/app/pypi/views.py b/pulp_python/app/pypi/views.py
index f3948520e..c3020b7cc 100644
--- a/pulp_python/app/pypi/views.py
+++ b/pulp_python/app/pypi/views.py
@@ -127,7 +127,7 @@ def upload(self, request, path):
         if settings.PYTHON_GROUP_UPLOADS:
             return self.upload_package_group(repo, artifact, filename, request.session)
 
-        result = dispatch(tasks.upload, [artifact, repo],
+        result = dispatch(tasks.upload, exclusive_resources=[artifact, repo],
                           kwargs={"artifact_sha256": artifact.sha256,
                                   "filename": filename,
                                   "repository_pk": str(repo.pk)})
@@ -164,7 +164,7 @@ def create_group_upload_task(self, cur_session, repository, artifact, filename,
         cur_session['artifacts'] = [(str(artifact.sha256), filename)]
         cur_session.modified = False
         cur_session.save()
-        result = dispatch(tasks.upload_group, [artifact, repository],
+        result = dispatch(tasks.upload_group, exclusive_resources=[artifact, repository],
                           kwargs={"session_pk": str(cur_session.session_key),
                                   "repository_pk": str(repository.pk)})
         return reverse('tasks-detail', args=[result.pk], request=None)
diff --git a/pulp_python/app/viewsets.py b/pulp_python/app/viewsets.py
index 8e148392b..88f38121d 100644
--- a/pulp_python/app/viewsets.py
+++ b/pulp_python/app/viewsets.py
@@ -51,7 +51,7 @@ def sync(self, request, pk):
 
         result = dispatch(
             tasks.sync,
-            [repository, remote],
+            exclusive_resources=[repository, remote],
             kwargs={
                 'remote_pk': str(remote.pk),
                 'repository_pk': str(repository.pk),
@@ -214,7 +214,7 @@ def create(self, request):
 
         result = dispatch(
             tasks.publish,
-            [repository_version.repository],
+            exclusive_resources=[repository_version.repository],
             kwargs={
                 'repository_version_pk': str(repository_version.pk)
             }