diff --git a/docs/changelog/6.x.x.txt b/docs/changelog/6.x.x.txt
index 179465f91..6df86e76e 100644
--- a/docs/changelog/6.x.x.txt
+++ b/docs/changelog/6.x.x.txt
@@ -37,7 +37,7 @@
  - fix: Edit Style returns wrong page
  - fix: Can not make Shortcut for CollaborationSystem
  - fix: EMS Transactions Dropping Free Events
-
+ - fix: EMS Prerequisite Cache Stale
 
 6.99.3
  - Someone removed the status from the submission templates. That has been
diff --git a/lib/WebGUI/Asset/Wobject/EventManagementSystem.pm b/lib/WebGUI/Asset/Wobject/EventManagementSystem.pm
index fe6729d2f..08525863f 100644
--- a/lib/WebGUI/Asset/Wobject/EventManagementSystem.pm
+++ b/lib/WebGUI/Asset/Wobject/EventManagementSystem.pm
@@ -3251,6 +3251,14 @@ sub www_editPrereqSetSave {
 	foreach (@newRequiredEvents) {
 		$self->session->db->write("insert into EventManagementSystem_prerequisiteEvents values (?,?)",[$psid,$_]);
 	}
+	
+	# Rebuild the EMS Cache
+	WebGUI::Workflow::Instance->create($self->session, {
+			workflowId=>'EMSworkflow00000000001',
+			className=>"none",
+			priority=>1
+	});
+	
 	return $self->www_managePrereqSets();
 }