diff --git a/.gitmodules b/.gitmodules
index a3775fc12d..b8cf7d3573 100644
--- a/.gitmodules
+++ b/.gitmodules
@@ -1,7 +1,9 @@
 [submodule "FV3"]
   path = FV3
-  url = https://github.com/NOAA-EMC/fv3atm
-  branch = develop
+  #url = https://github.com/NOAA-EMC/fv3atm
+  #branch = develop
+  url = https://github.com/DusanJovic-NOAA/fv3atm
+  branch = hafs_64bit_fms
 [submodule "WW3"]
   path = WW3
   url = https://github.com/NOAA-EMC/WW3
diff --git a/FV3 b/FV3
index c932926825..c2c1c8de76 160000
--- a/FV3
+++ b/FV3
@@ -1 +1 @@
-Subproject commit c932926825c1729fa41d127f8e8115007047722d
+Subproject commit c2c1c8de76d9bb187fbec035a00beaec0f2ace56