diff --git a/src/MDRequirementsSet.php b/src/MDRequirementsSet.php
index 46667c2..90cf0ea 100644
--- a/src/MDRequirementsSet.php
+++ b/src/MDRequirementsSet.php
@@ -23,7 +23,7 @@ final class MDRequirementsSet {
     // Object images need to be at least 500 px wide
     public const MIN_OBJECT_IMAGE_HEIGHT = 540;
 
-    public const MAX_FILESIZE_PDF = 20000000;
+    public const MAX_FILESIZE_PDF = 40000000;
 
     public const TIME_EARLIEST_YEAR = -6000000000;
     public const TIME_EARLIEST_DATE = '0001-01-01';