diff --git a/versionProperties/1.21.5.properties b/versionProperties/1.21.5.properties
index a9649a428..2aeaf6126 100644
--- a/versionProperties/1.21.5.properties
+++ b/versionProperties/1.21.5.properties
@@ -23,7 +23,7 @@ fabric_api_version=0.119.5+1.21.5
     immersive_portals_version=
     canvas_version=
     
-    fabric_incompatibility_list={ }
+    fabric_incompatibility_list={ "iris": "<=1.8.12" }
     fabric_recommend_list={}
     
     # Fabric mod run