diff --git a/submod.sh b/submod.sh
index f9524a3..7bf626c 100755
--- a/submod.sh
+++ b/submod.sh
@@ -6,7 +6,7 @@ git submodule update --init --recursive
 #
 # Use fixed master branch of circle-stdlib then re-update
 cd circle-stdlib/
-git checkout 3bd135d
+git checkout v16.6
 git submodule update --init --recursive
 cd -
 #