diff --git a/django-ask-sdk/django_ask_sdk/skill_adapter.py b/django-ask-sdk/django_ask_sdk/skill_adapter.py
index c6cbf34..7a50820 100644
--- a/django-ask-sdk/django_ask_sdk/skill_adapter.py
+++ b/django-ask-sdk/django_ask_sdk/skill_adapter.py
@@ -47,7 +47,7 @@
 #: the `header key <https://developer.amazon.com/docs/custom-skills/host-a-custom-skill-as-a-web-service.html#checking-the-signature-of-the-request>`__
 #: provided by Alexa, because of Django's HTTP
 #: `Meta headers <https://docs.djangoproject.com/en/2.1/ref/request-response/#django.http.HttpRequest.META>`__.
-SIGNATURE_KEY = "HTTP_SIGNATURE"
+SIGNATURE_KEY = "HTTP_SIGNATURE_256"
 
 logger = logging.getLogger("django.ask-sdk")
 
diff --git a/django-ask-sdk/requirements.txt b/django-ask-sdk/requirements.txt
index cac6465..60fab4b 100644
--- a/django-ask-sdk/requirements.txt
+++ b/django-ask-sdk/requirements.txt
@@ -1,2 +1,2 @@
-ask-sdk-webservice-support>=0.1.0
+ask-sdk-webservice-support>=1.3.3
 django>=2.0