diff --git a/packages/block-library/src/site-tagline/block.json b/packages/block-library/src/site-tagline/block.json
index 4012857772f9a0..9a70f6d3891c53 100644
--- a/packages/block-library/src/site-tagline/block.json
+++ b/packages/block-library/src/site-tagline/block.json
@@ -24,6 +24,7 @@
 			"fontSize": true,
 			"lineHeight": true,
 			"__experimentalFontFamily": true,
+			"__experimentalFontWeight": true,
 			"__experimentalTextTransform": true,
 			"__experimentalLetterSpacing": true
 		}