diff --git a/.devcontainer/Dockerfile b/.devcontainer/Dockerfile
index 47535bc..b3696b4 100644
--- a/.devcontainer/Dockerfile
+++ b/.devcontainer/Dockerfile
@@ -1,6 +1,6 @@
-# See here for image contents: https://github.com/microsoft/vscode-dev-containers/blob/v0.191.0/containers/python-3/.devcontainer/base.Dockerfile
-# [Choice] Python version: 3, 3.9, 3.8, 3.7, 3.6
-ARG VARIANT="3"
+# See here for image contents: https://github.com/microsoft/vscode-dev-containers/blob/v0.195.0/containers/python-3/.devcontainer/base.Dockerfile
+# [Choice] Python version (use -bullseye variants on local arm64/Apple Silicon): 3, 3.9, 3.8, 3.7, 3.6, 3-bullseye, 3.9-bullseye, 3.8-bullseye, 3.7-bullseye, 3.6-bullseye, 3-buster, 3.9-buster, 3.8-buster, 3.7-buster, 3.6-buster
+ARG VARIANT=3-bullseye
 FROM mcr.microsoft.com/vscode/devcontainers/python:0-${VARIANT}
 
 # [Optional] Allow the vscode user to pip install globally w/o sudo
diff --git a/.devcontainer/devcontainer.json b/.devcontainer/devcontainer.json
index b4fa680..0952928 100644
--- a/.devcontainer/devcontainer.json
+++ b/.devcontainer/devcontainer.json
@@ -1,13 +1,15 @@
 // For format details, see https://aka.ms/vscode-remote/devcontainer.json or this file's README at:
-// https://github.com/microsoft/vscode-dev-containers/tree/v0.191.0/containers/python-3
+// https://github.com/microsoft/vscode-dev-containers/tree/v0.195.0/containers/python-3
 {
 	"name": "Python 3",
 	"build": {
 		"dockerfile": "Dockerfile",
 		"context": "..",
 		"args": { 
-			// Update 'VARIANT' to pick a Python version: 3, 3.6, 3.7, 3.8, 3.9
-			"VARIANT": "3",
+			// Update 'VARIANT' to pick a Python version: 3, 3.9, 3.8, 3.7, 3.6.
+			// Append -bullseye or -buster to pin to an OS version.
+			// Use -bullseye variants on local on arm64/Apple Silicon.
+			"VARIANT": "3-bullseye",
 			// Options
 			"NODE_VERSION": "lts/*"
 		}