diff --git a/bootstrap-root.sh b/bootstrap-root.sh
index 70b8b3d..7bad116 100755
--- a/bootstrap-root.sh
+++ b/bootstrap-root.sh
@@ -1,6 +1,7 @@
 #! /bin/bash
 # fail immediately on error
 set -e
+CURLOPT=${CURLOPT:-"--location --remote-time --show-error --silent --fail --tlsv1.2"}
 
 apt update  \
 	&& apt dist-upgrade  \
@@ -32,9 +33,9 @@ apt update  \
 	&&  apt-file update
 
 # node related
-curl -RLSsf1 https://deb.nodesource.com/setup_10.x | bash -
+curl $CURLOPT https://deb.nodesource.com/setup_10.x | bash -
 apt-get install -y nodejs
 
 # python3 related
-curl -RLSsf1 https://bootstrap.pypa.io/get-pip.py | python2
-curl -RLSsf1 https://bootstrap.pypa.io/get-pip.py | python3
+curl $CURLOPT https://bootstrap.pypa.io/get-pip.py | python2
+curl $CURLOPT https://bootstrap.pypa.io/get-pip.py | python3
diff --git a/bootstrap.sh b/bootstrap.sh
index 821373f..3d7a545 100755
--- a/bootstrap.sh
+++ b/bootstrap.sh
@@ -1,9 +1,10 @@
-#! /bin/sh
+#! /bin/bash
 # fail immediately on error
 set -e
+CURLOPT=${CURLOPT:-"--location --remote-time --show-error --silent --fail --tlsv1.2"}
 
 # root part
-curl -RLSsf1 https://github.com/schtobia/bootstrap/raw/master/bootstrap-root.sh | sudo -SEH bash -
+curl $CURLOPT https://github.com/schtobia/bootstrap/raw/master/bootstrap-root.sh | sudo -SEH bash -
 
 # userspace part
-curl -RLSsf1 https://github.com/schtobia/bootstrap/raw/master/bootstrap-user.sh | bash -
+curl $CURLOPT https://github.com/schtobia/bootstrap/raw/master/bootstrap-user.sh | bash -