diff --git a/build/docker/ubuntu-bionic/Dockerfile b/build/docker/ubuntu-bionic/Dockerfile
index 350921a..5ece6e1 100644
--- a/build/docker/ubuntu-bionic/Dockerfile
+++ b/build/docker/ubuntu-bionic/Dockerfile
@@ -216,9 +216,14 @@
       php-dev \
       php-json \
       php-pear \
+      php-mbstring \
+      php-xml \
       re2c \
       composer
 
+RUN pecl install xdebug-3.1.1 && \
+      echo "zend_extension=xdebug.so" > /etc/php/7.2/cli/conf.d/20-xdebug.ini
+
 RUN apt-get install -y --no-install-recommends \
       `# Python dependencies` \
       python-all \