diff --git a/Dockerfile b/Dockerfile
index 1c8d8095..886ecb24 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,7 +1,7 @@
 ARG BUILDPLATFORM=linux/amd64
 ARG TARGETPLATFORM
 ARG DEBIAN_VERSION=buster-slim
-ARG PHP_VERSION=7.3
+ARG PHP_VERSION=7.3-buster
 ARG COMPOSER_VERSION=2.1
 ARG SUPERVISORD_VERSION=v0.7.3