diff --git a/Procfile b/Procfile
new file mode 100644
index 0000000..c76e14e
--- /dev/null
+++ b/Procfile
@@ -0,0 +1 @@
+web: npm run $(test "$BIBLIOGRAM_ENTRY" = 'assistant' && echo 'assistant' || echo 'start')
diff --git a/src/lib/constants.js b/src/lib/constants.js
index 346e799..3e76488 100644
--- a/src/lib/constants.js
+++ b/src/lib/constants.js
@@ -127,6 +127,11 @@ let constants = {
 
 // Override values from config and export the result
 const md = require("mixin-deep")
-const config = require("../../config")
-constants = md(constants, config)
+if (process.env.BIBLIOGRAM_CONFIG) { // presence of environment variable BIBLIOGRAM_CONFIG overrides /config.js
+	const config = JSON.parse(process.env.BIBLIOGRAM_CONFIG)
+	constants = md(constants, config)
+} else {
+	const config = require("../../config")
+	constants = md(constants, config)
+}
 module.exports = constants
diff --git a/src/site/assistant.js b/src/site/assistant.js
index 294b1c6..22ec9a0 100644
--- a/src/site/assistant.js
+++ b/src/site/assistant.js
@@ -5,7 +5,7 @@ const constants = require("../lib/constants")
 const passthrough = require("./passthrough")
 
 const pinski = new Pinski({
-	port: constants.port,
+	port: +process.env.PORT || constants.port,
 	relativeRoot: __dirname
 })
 
diff --git a/src/site/server.js b/src/site/server.js
index 741b5fc..8931819 100644
--- a/src/site/server.js
+++ b/src/site/server.js
@@ -5,7 +5,7 @@ const constants = require("../lib/constants")
 const passthrough = require("./passthrough")
 
 const pinski = new Pinski({
-	port: constants.port,
+	port: +process.env.PORT || constants.port,
 	relativeRoot: __dirname,
 	basicCacheControl: {
 		exts: ["ttf", "woff2", "png", "jpg", "jpeg", "svg", "gif", "webmanifest", "ico"],