diff --git a/docker/Dockerfile b/docker/Dockerfile
index 32477c2..2e3e24d 100644
--- a/docker/Dockerfile
+++ b/docker/Dockerfile
@@ -1,4 +1,4 @@
-FROM debian:stretch
+FROM debian:buster
 
 WORKDIR /explain
 
@@ -16,6 +16,7 @@ RUN apt-get update && \
                 libclone-perl \
                 libtest-deep-perl \
                 libtest-exception-perl \
+                pgformatter \
                 curl \
                 build-essential