diff --git a/Dockerfile b/Dockerfile
index 74ea027..d206470 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -43,5 +43,6 @@ RUN \
 	php7-pdo_mysql \
 	php7-pdo_sqlite \
 	php7-sockets \
+	php7-tokenizer \
 	php7-xml \
 	php7-zip