diff --git a/template.d/12_packages b/template.d/12_packages
index cf2482d..4e29042 100644
--- a/template.d/12_packages
+++ b/template.d/12_packages
@@ -1,5 +1,6 @@
 ## packages
 RUN if [ -n "${PACKAGES}" ]; then \
       IFS=';' && \
+      apt-get update && \
       install_packages ${PACKAGES[@]}; \
     fi