diff --git a/versionProperties/1.21.5.properties b/versionProperties/1.21.5.properties
index 2aeaf6126..ef92c18c3 100644
--- a/versionProperties/1.21.5.properties
+++ b/versionProperties/1.21.5.properties
@@ -23,7 +23,8 @@ fabric_api_version=0.119.5+1.21.5
     immersive_portals_version=
     canvas_version=
     
-    fabric_incompatibility_list={ "iris": "<=1.8.12" }
+    # some versions of 1.8.11 nightly builds may not work, but the ones after 2025-03-30 should
+    fabric_incompatibility_list={ "iris": "<=1.8.10" }
     fabric_recommend_list={}
     
     # Fabric mod run