diff --git a/test/docker_install.sh b/test/docker_install.sh
index a4a3a0b..28b213f 100644
--- a/test/docker_install.sh
+++ b/test/docker_install.sh
@@ -7,7 +7,7 @@ set -xe
 
 # Install git (the php image doesn't have it) which is required by composer
 apt-get update -yqq
-apt-get install git -yqq
+apt-get install git redis php-redis -yqq
 
 # Install phpunit, the tool that we will use for testing
 curl --location --output /usr/local/bin/phpunit https://phar.phpunit.de/phpunit.phar