diff --git a/scripts/upgrade-vlsi.sh b/scripts/upgrade-vlsi.sh
index 9edc2910..b1ee7962 100755
--- a/scripts/upgrade-vlsi.sh
+++ b/scripts/upgrade-vlsi.sh
@@ -19,7 +19,7 @@ if [[ ${plen} -gt 0 ]]; then
     for p in "${package_list[@]}"; do
         cd ${p}
         echo "Updating current directory: $PWD"
-        git checkout master
+        git checkout `basename "$(git rev-parse --abbrev-ref origin/HEAD)"`
         git pull
         cd - > /dev/null
         git add ${p}
diff --git a/vlsi/hammer-synopsys-plugins b/vlsi/hammer-synopsys-plugins
index e080a480..e53fa5c5 160000
--- a/vlsi/hammer-synopsys-plugins
+++ b/vlsi/hammer-synopsys-plugins
@@ -1 +1 @@
-Subproject commit e080a480009c715a69b4b2ce016af2c50b8bd453
+Subproject commit e53fa5c51f37937c83df3b004693552f59015c90