diff --git a/Dockerfile_stg b/Dockerfile_stg
index e08a8aa3..8ec9c1cf 100644
--- a/Dockerfile_stg
+++ b/Dockerfile_stg
@@ -6,6 +6,7 @@ FROM php:5.6-apache
 # Install required system libraries and PHP extensions for CakePHP
 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 && \
+    sed -i '/stretch-updates/d' /etc/apt/sources.list && \
     echo 'Acquire::AllowInsecureRepositories "true";' > /etc/apt/apt.conf.d/99allow-insecure && \
     echo 'Acquire::AllowDowngradeToInsecureRepositories "true";' >> /etc/apt/apt.conf.d/99allow-insecure && \
     apt-get update && \