diff --git a/.gitmodules b/.gitmodules
index ab0321a73..2c09fa095 100644
--- a/.gitmodules
+++ b/.gitmodules
@@ -1,3 +1,4 @@
 [submodule "sorc/post_gtg.fd"]
 	path = sorc/post_gtg.fd
 	url = https://github.com/NCAR/UPP_GTG
+        update = none