diff --git a/backend/scripts/install-java.sh b/backend/scripts/install-java.sh
index f1edb02d..b404233b 100755
--- a/backend/scripts/install-java.sh
+++ b/backend/scripts/install-java.sh
@@ -1,11 +1,10 @@
-#!/bin/env bash
+#!/bin/bash
 
 # lock
 touch /tmp/install-java.lock
 
 # install java
-apt-get update 
-apt-get install -y -f default-jdk
+apt-get update && apt-get install -y -f default-jdk
 ln -s /usr/bin/java /usr/local/bin/java
 
 # unlock
diff --git a/backend/scripts/install-nodejs.sh b/backend/scripts/install-nodejs.sh
index eada900a..8a054b69 100644
--- a/backend/scripts/install-nodejs.sh
+++ b/backend/scripts/install-nodejs.sh
@@ -1,4 +1,4 @@
-#!/bin/env bash
+#!/bin/bash
 
 # lock
 touch /tmp/install-nodejs.lock