diff --git a/src/components/compose.jsx b/src/components/compose.jsx
index 2a4dca8fe..e11f16d37 100644
--- a/src/components/compose.jsx
+++ b/src/components/compose.jsx
@@ -142,8 +142,8 @@ const MENTION_RE = new RegExp(
 
 // AI-generated, all other regexes are too complicated
 const HASHTAG_RE = new RegExp(
-  `(^|[^=\\/\\w])(#[a-z0-9_]+([a-z0-9_.]+[a-z0-9_]+)?)(?![\\/\\w])`,
-  'ig',
+  `(^|[^=\\/\\w])(#[\\p{L}\\p{N}_]+([\\p{L}\\p{N}_.]+[\\p{L}\\p{N}_]+)?)(?![\\/\\w])`,
+  'iug',
 );
 
 // https://github.com/mastodon/mastodon/blob/23e32a4b3031d1da8b911e0145d61b4dd47c4f96/app/models/custom_emoji.rb#L31