diff --git a/docker/Dockerfile-test b/docker/Dockerfile-test
index aa7bb6b..915d332 100644
--- a/docker/Dockerfile-test
+++ b/docker/Dockerfile-test
@@ -2,5 +2,5 @@ FROM ubuntu:focal
 
 ENV DEBIAN_FRONTEND noninteractive
 
-RUN apt update && apt install -y curl git unzip php7.4-cli
+RUN apt update && apt install -y curl git unzip php7.4-cli php7.4-mbstring php7.4-xml
 RUN curl -sS https://getcomposer.org/installer | php -- --install-dir=/usr/local/bin --filename=composer