:wrench: so fpdf < 1.8.2 is the offender apparently

composer.json

@@ -31,7 +31,7 @@
 	"require-dev": {
 		"phpunit/phpunit": "^9.1",
 		"phan/phan": "^2.7",
-		"setasign/fpdf": "^1.8"
+		"setasign/fpdf": "^1.8.2"
 	},
 	"suggest": {
 		"chillerlan/php-authenticator": "Yet another Google authenticator! Also creates URIs for mobile apps.",