diff --git a/s24/index.html b/s24/index.html
index 5e769a6..470de96 100644
--- a/s24/index.html
+++ b/s24/index.html
@@ -312,7 +312,7 @@ <h3>
                       <td>Wed, Jan. 31</td>
                       <td class="topic">
                         <a
-                          href="https://www.dropbox.com/s/mny34e7pa42qa6a/lec4-patch-operations.pdf?dl=0">Lec. 7:
+                          href="https://www.dropbox.com/scl/fi/o6shsehi3kt7pxkp49pxp/lec7-patch-operations3.key.pdf?rlkey=kh6gfu0ilnqptsp9j64y4z53b&dl=0">Lec. 7:
                           More Linear Filtering</i></a>
                         <div class="subtopic">
                           Gaussian filter, edge filter