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diff --git a/index.html b/index.html
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--- a/index.html
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@@ -97,6 +97,14 @@
                     <h2>Updates</h2>
                     <ul>
                         <li>
+                            <p class="first"><strong>September 2021</strong></p>
+                            <div>
+                                <ul>
+                                    <li><a href="https://clarkzjw.medium.com/2021-%E5%A4%8F-79bbbc6aba6f">2021・夏</a></li>
+                                </ul>
+                            </div>
+                        </li>
+                        <li>
                             <p class="first"><strong>June 2021</strong></p>
                             <div>
                                 <ul>