diff --git a/Dockerfile-2019.1.0 b/Dockerfile-2019.1.0
index c0a3570..9c38fe4 100644
--- a/Dockerfile-2019.1.0
+++ b/Dockerfile-2019.1.0
@@ -1,4 +1,5 @@
-FROM docker.io/python:3.9.7-buster
+ARG PYTHON_TAG
+FROM docker.io/python:$PYTHON_TAG
 
 ARG DEBIAN_FRONTEND=noninteractive
 # dolfin
diff --git a/Makefile b/Makefile
index 433ee88..2fd4f13 100644
--- a/Makefile
+++ b/Makefile
@@ -10,14 +10,15 @@ latest:
 	docker build -t fenics -t fenics-2019.1.0.post0 -f Dockerfile-2019.1.0.post0 .
 
 SHELL=bash
+# docker buildx build --platform linux/amd64,linux/arm64
 buster:
 	for TAG in $(shell echo 3.6.{9..13}-buster 3.{7..8}.{4..10}-buster {3.6.{14..15},3.{7..8}.{11..12},3.9.{6..9},3.10.{0..1}}-buster | sort); do \
 		echo BUILDING $$TAG && \
-		docker buildx build --platform linux/amd64,linux/arm64 \
-			-t mindthemath/fenics:2019.1.0-$$TAG \
+		docker build \
+			-t mindthemath/fenics-arm64:2019.1.0-$$TAG \
 			--build-arg PYTHON_TAG=$$TAG \
 			-f Dockerfile-2019.1.0 . && \
-		docker push mindthemath/fenics:2019.1.0-$$TAG && \
-		docker rmi mindthemath/fenics:2019.1.0-$$TAG || exit; \
+		docker push mindthemath/fenics-arm64:2019.1.0-$$TAG && \
+		docker rmi mindthemath/fenics-arm64:2019.1.0-$$TAG || exit; \
 	done