diff --git a/contents/projects/coursemate/index.md b/contents/projects/coursemate/index.md
index cf6a9e9d..13bf0ae3 100644
--- a/contents/projects/coursemate/index.md
+++ b/contents/projects/coursemate/index.md
@@ -17,6 +17,7 @@ favicon: ./favicon.avif
 
 social:
   github: https://github.com/ut-code/coursemate
+  twitter: https://x.com/course_mate
 ---
 
 CourseMate は、同じ授業の友達をつくることができるアプリです。
diff --git a/contents/projects/nikochan/index.md b/contents/projects/nikochan/index.md
index b6c7d9e0..e64426f8 100644
--- a/contents/projects/nikochan/index.md
+++ b/contents/projects/nikochan/index.md
@@ -17,6 +17,7 @@ thumbnail:
 social:
   github: https://github.com/na-trium-144/falling-nikochan
   youtube: https://www.youtube.com/@nikochan144
+  twitter: https://x.com/nikochan144
 ---
 
 ## 概要
diff --git a/contents/projects/nikochan/thumbnail.jpg b/contents/projects/nikochan/thumbnail.jpg
index 497103f9..6f4ddc6c 100644
Binary files a/contents/projects/nikochan/thumbnail.jpg and b/contents/projects/nikochan/thumbnail.jpg differ
diff --git a/contents/projects/syllabus/index.md b/contents/projects/syllabus/index.md
index 0bfa9753..6b2ea2ab 100644
--- a/contents/projects/syllabus/index.md
+++ b/contents/projects/syllabus/index.md
@@ -6,7 +6,7 @@ app:
   platform: [web]
   domain: [tool] # バックエンドついたら app になる
 
-order: 3
+order: 2
 date: 2023-10-02
 kind: long-term
 status: stable
diff --git a/contents/projects/touhoubeat/index.md b/contents/projects/touhoubeat/index.md
index f166e5e6..2d9db1e7 100644
--- a/contents/projects/touhoubeat/index.md
+++ b/contents/projects/touhoubeat/index.md
@@ -15,7 +15,7 @@ thumbnail:
   src: ./thumbnail.png
 
 social:
-  website: https://th-beat.net/
+  twitter: https://x.com/touhou_beat
 ---
 
 ## 概要
diff --git a/contents/projects/ut-bridge/index.md b/contents/projects/ut-bridge/index.md
index dfd0296e..9d1b20b6 100644
--- a/contents/projects/ut-bridge/index.md
+++ b/contents/projects/ut-bridge/index.md
@@ -6,7 +6,6 @@ app:
   platform: [web]
   domain: [app]
 
-order: 2
 date: 2025-04-01
 kind: long-term
 status: released
diff --git a/src/pages/projects/[...id].astro b/src/pages/projects/[...id].astro
index bb8f0d67..f4de5642 100644
--- a/src/pages/projects/[...id].astro
+++ b/src/pages/projects/[...id].astro
@@ -87,6 +87,11 @@ if (project.data.status !== "dead") {
                 icon: "feather:github",
                 label: "GitHub",
               },
+              {
+                href: project.data.social?.twitter,
+                icon: "flowbite:x-solid",
+                label: "X (旧 Twitter)",
+              },
               {
                 href: project.data.social?.youtube,
                 icon: "feather:youtube",