diff --git a/workspace/Dockerfile b/workspace/Dockerfile
index cbbeb2e..f41f163 100644
--- a/workspace/Dockerfile
+++ b/workspace/Dockerfile
@@ -444,6 +444,7 @@ RUN if [ ${INSTALL_CASSANDRA} = true ]; then \
 ARG INSTALL_PHPREDIS=false
 
 RUN if [ ${INSTALL_PHPREDIS} = true ]; then \
+    apt-get update -yqq && \
     apt-get install -yqq php-redis \
 ;fi