diff --git a/_data/alumni.yml b/_data/alumni.yml
index 5b1bfae..95c851f 100644
--- a/_data/alumni.yml
+++ b/_data/alumni.yml
@@ -26,63 +26,63 @@
   email: yaox16@mails.tsinghua.edu.cn
   education1: B.E. in CS at Tsinghua University, 2012.08 - 2016.07
 - name: Haitian Pang
-  photo: 1.png
+  photo: 1.jpg
   info: Ph.D., 2014-2019
   email:
 - name: Zhengyuan Pang
-  photo: 1.png
+  photo: 1.jpg
   info: Ph.D.
   email:
 - name: Ming Ma
-  photo: 1.png
+  photo: 1.jpg
   info: Ph.D., 2013-2018
   email:
 - name: Wen Hu
-  photo: 1.png
+  photo: 1.jpg
   info: Ph.D., 2012-2017
   email:
 
 - name: Zirui Zhu
-  photo: 1.png
+  photo: 1.jpg
   info: Master, 2020-2023
 - name: Wenzhe Li
-  photo: 1.png
+  photo: 1.jpg
   info: Master, 2020-2023
   email:
   education1:
 - name: Ze Meng
-  photo: 1.png
+  photo: 1.jpg
   info: Master, 2018-2021
   email:
   education1:
 
 - name: Feihong Zhao
-  photo: 1.png
+  photo: 1.jpg
   info: Master, 2018-2021
   email:
   education1: National University of Defense Technology
 
 - name: Wei Tu
-  photo: 1.png
+  photo: 1.jpg
   info: Master, 2017-2020
   email:
 - name: Kun Yi
-  photo: 1.png
+  photo: 1.jpg
   info: Master, 2017-2020
   email:
 - name: Zhexv Zhang
-  photo: 1.png
+  photo: 1.jpg
   info: Master, 2017-2020
   email:
 - name: Anqi Ma
-  photo: 1.png
+  photo: 1.jpg
   info: Master, 2015-2018
   email:
 - name: Tianyun Chen
-  photo: 1.png
+  photo: 1.jpg
   info: Master, 2015-2018
   email:
 - name: Chen Yan
-  photo: 1.png
+  photo: 1.jpg
   info: Master, 2015-2018
   email: