diff --git a/deploy/modules/pubsub.bicep b/deploy/modules/pubsub.bicep
index a452882..c2da9a0 100644
--- a/deploy/modules/pubsub.bicep
+++ b/deploy/modules/pubsub.bicep
@@ -3,7 +3,7 @@ param name string = 'chatr'
 param sku string = 'Free_F1'
 param eventHandlerUrl string
 
-resource pubsub 'Microsoft.SignalRService/webPubSub@2021-10-01' = {
+resource pubsub 'Microsoft.SignalRService/webPubSub@2021-04-01-preview' = {
   name: name
   location: location