diff --git a/Dockerfile_stg b/Dockerfile_stg
index 06ecfcd0..cae1fb91 100644
--- a/Dockerfile_stg
+++ b/Dockerfile_stg
@@ -4,7 +4,9 @@
 FROM php:5.6-apache
 
 # Install required system libraries and PHP extensions for CakePHP
-RUN apt-get update && \
+RUN sed -i 's|http://deb.debian.org/debian|http://archive.debian.org/debian|g' /etc/apt/sources.list && \
+    sed -i 's|http://security.debian.org/debian-security|http://archive.debian.org/debian-security|g' /etc/apt/sources.list && \
+    apt-get update && \
     apt-get install -y libpng-dev libjpeg-dev libfreetype6-dev libcurl4-openssl-dev libxml2-dev libssl-dev libmcrypt-dev libicu-dev libkrb5-dev && \
     docker-php-ext-configure gd --with-freetype-dir=/usr/include/ --with-jpeg-dir=/usr/include/ && \
     docker-php-ext-install mysql mbstring gd curl imap