diff --git a/util/create_upgrade.sh b/util/create_upgrade.sh
new file mode 100755
index 0000000..8b49ceb
--- /dev/null
+++ b/util/create_upgrade.sh
@@ -0,0 +1,9 @@
+#!/bin/sh
+
+fromver=$1
+ver=$2
+input=cartodb--${ver}.sql
+output=cartodb--${fromver}--${ver}.sql
+
+cat ${input} | grep -v 'duplicated extension$' > ${output}
+