diff --git a/.gitmodules b/.gitmodules
index 0b5bccef9a..8aaefa2468 100644
--- a/.gitmodules
+++ b/.gitmodules
@@ -1,7 +1,7 @@
 [submodule "FV3"]
   path = FV3
   url = https://github.com/zhanglikate/fv3atm
-  branch = catchem_Apr
+  branch = thom-cat-may
 [submodule "WW3"]
   path = WW3
   url = https://github.com/NOAA-EMC/WW3
@@ -45,7 +45,7 @@
 [submodule "CATChem"]
   path = CATChem
   url = https://github.com/zhanglikate/CATChem.git
-  branch = gsl-updates
+  branch = thom-cat
 [submodule "NOAHMP"]
   path = NOAHMP-interface/noahmp
   url = https://github.com/NOAA-EMC/noahmp
diff --git a/CATChem b/CATChem
index 2a86dcd266..d537b1c002 160000
--- a/CATChem
+++ b/CATChem
@@ -1 +1 @@
-Subproject commit 2a86dcd2660a3538872e5f895b92a72d432da7c9
+Subproject commit d537b1c0027482f1f855d78f3b74cf1ded50f52a
diff --git a/FV3 b/FV3
index b5675855e2..d8473b9b76 160000
--- a/FV3
+++ b/FV3
@@ -1 +1 @@
-Subproject commit b5675855e22bb94ab675833bd6f81b6e55d8bcc6
+Subproject commit d8473b9b76c97c6d00dca8b568d553b11815f98f