diff --git a/index.html b/index.html
index 20efdd8..fd2b917 100644
--- a/index.html
+++ b/index.html
@@ -501,12 +501,12 @@
 </ul>
 </li>
 <li>
-<a href="https://www.classes.cs.uchicago.edu/archive/2015/winter/22300-1/">CS 223</a> <strong>Purely Functional Data Structures In Elm</strong> <em>University of Chicago</em> <img src="https://assets-cdn.github.com/images/icons/emoji/unicode/1f4bb.png" width="20" height="20" alt="Assignments" title="Assignments"> <img src="https://assets-cdn.github.com/images/icons/emoji/unicode/1f4dd.png" width="20" height="20" alt="Lecture Notes" title="Lecture Notes">
+<a href="https://www.classes.cs.uchicago.edu/archive/2017/spring/22300-1/">CS 223</a> <strong>Purely Functional Data Structures In Elm</strong> <em>University of Chicago</em> <img src="https://assets-cdn.github.com/images/icons/emoji/unicode/1f4bb.png" width="20" height="20" alt="Assignments" title="Assignments"> <img src="https://assets-cdn.github.com/images/icons/emoji/unicode/1f4dd.png" width="20" height="20" alt="Lecture Notes" title="Lecture Notes">
 
 <ul>
 <li>This course teaches functional reactive programming and purely functional data structures based on Chris Okazaki's book and using the Elm programming language.</li>
-<li><a href="https://www.classes.cs.uchicago.edu/archive/2015/winter/22300-1/Schedule.html">Lectures</a></li>
-<li><a href="https://www.classes.cs.uchicago.edu/archive/2015/winter/22300-1/Schedule.html">Assignments</a></li>
+<li><a href="https://www.classes.cs.uchicago.edu/archive/2017/spring/22300-1/Schedule.html">Lectures</a></li>
+<li><a href="https://www.classes.cs.uchicago.edu/archive/2017/spring/22300-1/Schedule.html">Assignments</a></li>
 </ul>
 </li>
 <li>