diff --git a/index.html b/index.html
index 1e73119..4919870 100644
--- a/index.html
+++ b/index.html
@@ -150,7 +150,7 @@ <h2>Program</h2>
       <td width="20%"><em>Hsin-Ying Lee</em></td>
       <td width="10%"><b>08:40 - <br /> 09:00</b></td>
       <td width="10%">
-        <a href="https://drive.google.com/file/d/1DzaBiCqSBgXFRlHPRyAL1LDemMPahUW7/view?usp=sharing">PDF</a>
+        <a href="https://drive.google.com/file/d/1-7uQe07v0R1-E7h05LmznlkNiom4tN80/view?usp=drive_link">PDF</a>
       </td>
     </tr>
 
@@ -165,7 +165,7 @@ <h2>Program</h2>
       <td><em>Peiye Zhuang</em></td>
       <td><b>09:10 - <br /> 10:00</b></td>
       <td width="10%">
-        <a href="https://drive.google.com/file/d/1HopsCrtr6lo_3TvURqT07x8LMCkj_2P2/view?usp=sharing">PDF</a>
+        <a href="https://drive.google.com/file/d/1qpPSJzBjmwRtsDKjU5RKLHr7A_L6TvGG/view?usp=drive_link">PDF</a>
       </td>
     </tr>
 
@@ -178,7 +178,7 @@ <h2>Program</h2>
       <td><em>Hsin-Ying Lee</em></td>
       <td><b>10:10 - <br /> 10:40</b></td>
       <td width="10%">
-        <a href="https://drive.google.com/file/d/13SwjQPHpp7Uhv9X7Y9PIu3NKDNqjkXZo/view?usp=sharing">PDF</a>
+        <a href="https://drive.google.com/file/d/1_-yOGJJmjPB_um0zRXiurL1dYudA7pTH/view?usp=drive_link">PDF</a>
       </td>
     </tr>