diff --git a/.gitmodules b/.gitmodules
index 8b5b737335..66acabcfbf 100644
--- a/.gitmodules
+++ b/.gitmodules
@@ -1,7 +1,7 @@
 [submodule "FV3"]
   path = FV3
-  url = https://github.com/NOAA-EMC/fv3atm
-  branch = develop
+  url = https://github.com/mzhangw/fv3atm
+  branch = revert_iovr4 
 [submodule "NEMS"]
   path = NEMS
   url = https://github.com/NOAA-EMC/NEMS