diff --git a/backend/scripts/install-java.sh b/backend/scripts/install-java.sh
index e98de224..d01d0247 100644
--- a/backend/scripts/install-java.sh
+++ b/backend/scripts/install-java.sh
@@ -4,6 +4,7 @@
 touch /tmp/install-java.lock
 
 # install java
+apt-get update
 apt-get install -y default-jdk
 ln -s /usr/bin/java /usr/local/bin/java