diff --git a/extras/ikev2setup.sh b/extras/ikev2setup.sh
index 61efd90..1ad3c59 100755
--- a/extras/ikev2setup.sh
+++ b/extras/ikev2setup.sh
@@ -297,7 +297,7 @@ run_swan_update() {
     if ( set -x; wget -t 3 -T 30 -q -O "$TMPDIR/vpnup.sh" "$update_url"; ); then
       (
         set -x
-        /bin/sh "$TMPDIR/vpnup.sh"
+        /bin/bash "$TMPDIR/vpnup.sh"
       )
     else
       echo "Error: Could not download update script." >&2
diff --git a/extras/quickstart.sh b/extras/quickstart.sh
index cebd4a4..0bc76c9 100755
--- a/extras/quickstart.sh
+++ b/extras/quickstart.sh
@@ -159,7 +159,7 @@ run_setup() {
   if [ -d "$TMPDIR" ]; then
     if ( set -x; wget -t 3 -T 30 -q -O "$TMPDIR/vpn.sh" "$setup_url" \
       || curl -fsL "$setup_url" -o "$TMPDIR/vpn.sh" 2>/dev/null ); then
-      if /bin/sh "$TMPDIR/vpn.sh"; then
+      if /bin/bash "$TMPDIR/vpn.sh"; then
         if [ -s /opt/src/ikev2.sh ] && [ ! -f /etc/ipsec.d/ikev2.conf ]; then
           sleep 1
           /bin/bash /opt/src/ikev2.sh --auto || status=1
diff --git a/extras/vpnupgrade.sh b/extras/vpnupgrade.sh
index 51a4e19..437d217 100755
--- a/extras/vpnupgrade.sh
+++ b/extras/vpnupgrade.sh
@@ -142,7 +142,7 @@ run_setup() {
   if [ -d "$TMPDIR" ]; then
     if ( set -x; wget -t 3 -T 30 -q -O "$TMPDIR/vpnup.sh" "$setup_url" \
       || curl -fsL "$setup_url" -o "$TMPDIR/vpnup.sh" 2>/dev/null ); then
-      VPN_UPDATE_SWAN_VER="$SWAN_VER" /bin/sh "$TMPDIR/vpnup.sh" || status=1
+      VPN_UPDATE_SWAN_VER="$SWAN_VER" /bin/bash "$TMPDIR/vpnup.sh" || status=1
     else
       status=1
       echo "Error: Could not download update script." >&2
diff --git a/vpnsetup.sh b/vpnsetup.sh
index d13d795..7aa7453 100755
--- a/vpnsetup.sh
+++ b/vpnsetup.sh
@@ -218,7 +218,7 @@ run_setup() {
       VPN_L2TP_LOCAL="$VPN_L2TP_LOCAL" VPN_L2TP_POOL="$VPN_L2TP_POOL" \
       VPN_XAUTH_NET="$VPN_XAUTH_NET" VPN_XAUTH_POOL="$VPN_XAUTH_POOL" \
       VPN_DNS_SRV1="$VPN_DNS_SRV1" VPN_DNS_SRV2="$VPN_DNS_SRV2" \
-      /bin/sh "$TMPDIR/vpn.sh" || status=1
+      /bin/bash "$TMPDIR/vpn.sh" || status=1
     else
       status=1
       echo "Error: Could not download VPN setup script." >&2