diff --git a/scripts/feed.sh b/scripts/feed.sh
index 79808b8..80b12a8 100755
--- a/scripts/feed.sh
+++ b/scripts/feed.sh
@@ -1,3 +1,8 @@
+#!/bin/bash
+#
+# Run this script inside Vagrant VM, as SUDO, from /vagrant/scripts directory.
+# It will be feeding images for GreengrassImageClassification Lambda.
+
 files=(../images/*.jpg)
 
 RANDOM=$$$(date +%s)
diff --git a/scripts/install.sh b/scripts/install.sh
index bfbb949..8a5be00 100755
--- a/scripts/install.sh
+++ b/scripts/install.sh
@@ -1,3 +1,9 @@
+#!/bin/bash
+
+VERSION="1.8.0"
+PLATFORM="x86-64"
+GREENGRASS_RELEASE_URL=https://d1onfpft10uf5o.cloudfront.net/greengrass-core/downloads/${VERSION}/greengrass-linux-${PLATFORM}-${VERSION}.tar.gz
+
 # Setup
 sudo adduser --system ggc_user
 sudo groupadd --system ggc_group
@@ -6,20 +12,23 @@ sudo groupadd --system ggc_group
 sudo apt-get update
 sudo apt-get install -y sqlite3 python2.7 binutils curl
 
-wget -O /vagrant/downloads/root.ca.pem http://www.symantec.com/content/en/us/enterprise/verisign/roots/VeriSign-Class%203-Public-Primary-Certification-Authority-G5.pem
-
-# Copy greengrass binaries
-sudo tar -xzf /vagrant/downloads/greengrass-ubuntu-x86-64-1.5.0.tar.gz -C /
+# Download and unpack greengrass binaries
+wget $GREENGRASS_RELEASE_URL
+GREENGRASS_RELEASE=$(basename $GREENGRASS_RELEASE_URL)
+sudo tar -xzf $GREENGRASS_RELEASE -C /
+rm $GREENGRASS_RELEASE
 
 # Install ML inference dependencies (MXNet)
 sudo apt-get install -y python-pip python-dev gcc
 sudo pip install mxnet
 sudo apt-get install -y python-opencv
 
+# Get root certificate
+wget -O /vagrant/certs/root.ca.pem http://www.symantec.com/content/en/us/enterprise/verisign/roots/VeriSign-Class%203-Public-Primary-Certification-Authority-G5.pem
+
 # Copy certificates and configurations
 sudo cp /vagrant/certs/* /greengrass/certs
 sudo cp /vagrant/config/* /greengrass/config
-sudo cp /vagrant/downloads/root.ca.pem /greengrass/certs
 
 # Create a source for images to map into the Lambda space later
 sudo mkdir /images
diff --git a/scripts/update_ggc.sh b/scripts/update_ggc.sh
index 70bc69e..d43adbe 100755
--- a/scripts/update_ggc.sh
+++ b/scripts/update_ggc.sh
@@ -1,3 +1,5 @@
+#!/bin/bash
+
 echo "Reseting Greengrass Core for a new group."
 
 echo "Copy certificates..."