diff --git a/tools/update.sh b/tools/update.sh
new file mode 100755
index 0000000..7960226
--- /dev/null
+++ b/tools/update.sh
@@ -0,0 +1,47 @@
+#!/bin/bash
+if [ $# -lt 1 -o $# -gt 2 ]; then
+    echo "Usage $0 <repo> [<branch>]"
+    exit 1
+fi
+
+BRANCH="master"
+if [ $# -ge 2 ]; then
+    BRANCH=$2
+fi
+
+modules="juju-charms devops descriptor-packages openvim RO SO UI osmclient"
+list=""
+for i in $modules; do
+    if [ "$1" == "$i" -o "$1" == "all" ]; then
+        list="$1"
+        break
+    fi
+done
+
+[ "$1" == "all" ] && list=$modules
+
+if [ "$1" == "juju-charms" ] && [ "$BRANCH" != "master" ]; then
+    echo "Repo $1 does not have branch $BRANCH"
+    exit 1
+fi
+
+if [ -z "$list" ]; then
+    echo "Repo must be one of these: $modules all"
+    exit 1
+fi
+
+for i in $list; do
+    echo
+    echo $i
+    git -C $i fetch
+    if [ "$i" == "juju-charms" ] && [ "$1" == "all" ] ; then
+        #This is to allow "./update.sh all v2.0", and still update "juju-charms" with master
+        git -C $i checkout master
+    else
+        git -C $i checkout $BRANCH
+    fi
+    git -C $i pull --rebase
+done
+
+exit 0
+