diff --git a/course-selection/index.html b/course-selection/index.html
index 25cd3ee..28832f2 100644
--- a/course-selection/index.html
+++ b/course-selection/index.html
@@ -30,7 +30,7 @@
 
 <p>
 <video controls preload>
-<source src="https://www.yatex.org/gitbucket/yuuji/Guidance/pages/movie/matsuyama-drone.mp4">
+<source src="https://www.yatex.org/gitbucket/yuuji/Guidance/raw/master/movie/matsuyama-drone.webm">
 </video>
 </p>
 
diff --git a/movie/matsuyama-drone.webm b/movie/matsuyama-drone.webm
new file mode 100644
index 0000000..6a42f66
--- /dev/null
+++ b/movie/matsuyama-drone.webm
Binary files differ