diff --git a/electron-app/src/server/websites/bluesky/bluesky.service.ts b/electron-app/src/server/websites/bluesky/bluesky.service.ts
index 770bfdd2..ad5e2d12 100644
--- a/electron-app/src/server/websites/bluesky/bluesky.service.ts
+++ b/electron-app/src/server/websites/bluesky/bluesky.service.ts
@@ -182,7 +182,9 @@ export class Bluesky extends Website {
 
   formatTags(tags: string[]) {
     return this.parseTags(
-      tags.map(tag => tag.replace(/[^a-z0-9]/gi, ' ')).map(tag => tag.split(' ').join('')),
+      tags
+        .map(tag => tag.replace(/[^\p{Letter}\p{Number}]/giu, ' '))
+        .map(tag => tag.split(' ').join('')),
       { spaceReplacer: '_' },
     ).map(tag => `#${tag}`);
   }
diff --git a/electron-app/src/server/websites/megalodon/megalodon.service.ts b/electron-app/src/server/websites/megalodon/megalodon.service.ts
index d7bfcca0..ecf1eac7 100644
--- a/electron-app/src/server/websites/megalodon/megalodon.service.ts
+++ b/electron-app/src/server/websites/megalodon/megalodon.service.ts
@@ -220,7 +220,9 @@ export abstract class Megalodon extends Website {
 
   formatTags(tags: string[]) {
     return this.parseTags(
-      tags.map(tag => tag.replace(/[^a-z0-9]/gi, ' ')).map(tag => tag.split(' ').join('')),
+      tags
+        .map(tag => tag.replace(/[^\p{Letter}\p{Number}]/giu, ' '))
+        .map(tag => tag.split(' ').join('')),
       { spaceReplacer: '_' },
     ).map(tag => `#${tag}`);
   }
diff --git a/electron-app/src/server/websites/misskey/misskey.service.ts b/electron-app/src/server/websites/misskey/misskey.service.ts
index fd2c7847..ad4d89d1 100644
--- a/electron-app/src/server/websites/misskey/misskey.service.ts
+++ b/electron-app/src/server/websites/misskey/misskey.service.ts
@@ -213,7 +213,7 @@ export class MissKey extends Website {
   formatTags(tags: string[]) {
     return this.parseTags(
       tags
-        .map(tag => tag.replace(/[^a-z0-9]/gi, ' '))
+        .map(tag => tag.replace(/[^\p{Letter}\p{Number}]/giu, ' '))
         .map(tag =>
           tag
             .split(' ')
diff --git a/electron-app/src/server/websites/twitter/twitter.service.ts b/electron-app/src/server/websites/twitter/twitter.service.ts
index 51918c9b..38939a6d 100644
--- a/electron-app/src/server/websites/twitter/twitter.service.ts
+++ b/electron-app/src/server/websites/twitter/twitter.service.ts
@@ -61,7 +61,9 @@ export class Twitter extends Website {
 
   formatTags(tags: string[]) {
     return this.parseTags(
-      tags.map(tag => tag.replace(/[^a-z0-9]/gi, ' ')).map(tag => tag.split(' ').join('')),
+      tags
+        .map(tag => tag.replace(/[^\p{Letter}\p{Number}]/giu, ' '))
+        .map(tag => tag.split(' ').join('')),
       { spaceReplacer: '_' },
     ).map(tag => `#${tag}`);
   }