diff --git a/package-lock.json b/package-lock.json
index c9d0574..bf6f81c 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -27,6 +27,7 @@
         "get-stream": "^6.0.1",
         "h3": "^1.12.0",
         "heatsync": "^2.5.3",
+        "js-yaml": "^4.1.0",
         "minimist": "^1.2.8",
         "node-fetch": "^2.6.7",
         "prettier-bytes": "^1.0.4",
@@ -1016,6 +1017,11 @@
         "url": "https://github.com/chalk/ansi-styles?sponsor=1"
       }
     },
+    "node_modules/argparse": {
+      "version": "2.0.1",
+      "resolved": "https://registry.npmjs.org/argparse/-/argparse-2.0.1.tgz",
+      "integrity": "sha512-8+9WqebbFzpX9OR+Wa6O29asIogeRMzcGtAINdpMHHyAg10f05aSFVBbcEqGf/PXw1EjAZ+q2/bEBg3DvurK3Q=="
+    },
     "node_modules/as-table": {
       "version": "1.0.55",
       "resolved": "https://registry.npmjs.org/as-table/-/as-table-1.0.55.tgz",
@@ -1925,6 +1931,17 @@
         "node": "^14.15.0 || ^16.10.0 || >=18.0.0"
       }
     },
+    "node_modules/js-yaml": {
+      "version": "4.1.0",
+      "resolved": "https://registry.npmjs.org/js-yaml/-/js-yaml-4.1.0.tgz",
+      "integrity": "sha512-wpxZs9NoxZaJESJGIZTyDEaYpl0FKSA+FB9aJiyemKhMwkxQg63h4T1KJgUGHpTqPDNRcmmYLugrRjJlBtWvRA==",
+      "dependencies": {
+        "argparse": "^2.0.1"
+      },
+      "bin": {
+        "js-yaml": "bin/js-yaml.js"
+      }
+    },
     "node_modules/just-kebab-case": {
       "version": "4.2.0",
       "resolved": "https://registry.npmjs.org/just-kebab-case/-/just-kebab-case-4.2.0.tgz",
diff --git a/package.json b/package.json
index 3fd7651..5933ba9 100644
--- a/package.json
+++ b/package.json
@@ -36,6 +36,7 @@
     "get-stream": "^6.0.1",
     "h3": "^1.12.0",
     "heatsync": "^2.5.3",
+    "js-yaml": "^4.1.0",
     "minimist": "^1.2.8",
     "node-fetch": "^2.6.7",
     "prettier-bytes": "^1.0.4",
diff --git a/scripts/seed.js b/scripts/seed.js
index 55ada69..16be900 100755
--- a/scripts/seed.js
+++ b/scripts/seed.js
@@ -87,9 +87,6 @@ async function validateHomeserverOrigin(serverUrlPrompt, url) {
 	if (res.status !== 200) return `There is no Matrix server at that URL (${url}/_matrix/client/versions returned ${res.status})`
 	try {
 		var json = await res.json()
-		if (!Array.isArray(json?.versions) || !json.versions.includes("v1.11")) {
-			return `OOYE needs Matrix version v1.11, but ${url} doesn't support this`
-		}
 	} catch (e) {
 		return `There is no Matrix server at that URL (${url}/_matrix/client/versions is not JSON)`
 	}
diff --git a/src/matrix/read-registration.js b/src/matrix/read-registration.js
index 8438387..9efffdf 100644
--- a/src/matrix/read-registration.js
+++ b/src/matrix/read-registration.js
@@ -4,6 +4,7 @@ const fs = require("fs")
 const crypto = require("crypto")
 const assert = require("assert").strict
 const path = require("path")
+const yaml = require("js-yaml")
 
 const registrationFilePath = path.join(process.cwd(), "registration.yaml")
 
@@ -59,10 +60,18 @@ function getTemplateRegistration() {
 function readRegistration() {
 	/** @type {import("../types").AppServiceRegistrationConfig} */ // @ts-ignore
 	let result = null
-	try {
+	if (fs.existsSync(registrationFilePath)) {
 		const content = fs.readFileSync(registrationFilePath, "utf8")
-		result = JSON.parse(content)
-	} catch (e) {}
+		if (content.startsWith("{")) { // Use JSON parser
+			result = JSON.parse(content)
+			checkRegistration(result)
+		} else { // Use YAML parser
+			result = yaml.load(content)
+			checkRegistration(result)
+			// Convert to JSON
+			writeRegistration(result)
+		}
+	}
 	return result
 }