diff --git a/downloads.html b/downloads.html
index 8d424eded..7aaf9fc6f 100644
--- a/downloads.html
+++ b/downloads.html
@@ -763,6 +763,83 @@ <h2 id="_overview">Overview</h2>
 <h2 id="stable">Current/stable: Series 1.6</h2>
 <div class="sectionbody">
 <div class="sect2">
+<h3 id="_1_6_4">1.6.4</h3>
+<div class="ulist"><ul>
+<li>
+<p>
+<a href="http://swift-lang.github.io/swift-t-downloads/1.6/swift-t-1.6.4.tar.gz">swift-t-1.6.4.tar.gz</a> (11 MB)
+</p>
+</li>
+<li>
+<p>
+2024-07-12
+</p>
+</li>
+<li>
+<p>
+ExM c-utils 0.6.3
+</p>
+</li>
+<li>
+<p>
+ADLB/X 1.0.2
+</p>
+</li>
+<li>
+<p>
+Turbine 1.4.2
+</p>
+</li>
+<li>
+<p>
+STC 1.0.2
+</p>
+</li>
+</ul></div>
+<div class="paragraph"><p><strong>Changes:</strong></p></div>
+<div class="ulist"><ul>
+<li>
+<p>
+Update to Log4J 2
+</p>
+</li>
+<li>
+<p>
+Better MPI auto-detection and flags
+</p>
+</li>
+<li>
+<p>
+Move to <code>worker_hook_startup</code> / <code>worker_hook_shutdown</code>
+</p>
+</li>
+<li>
+<p>
+Move to <code>@r</code> in <code>TURBINE_STDOUT</code>
+</p>
+</li>
+<li>
+<p>
+PBS improvements for Frontier
+</p>
+</li>
+<li>
+<p>
+LSF improvements for Summit
+</p>
+</li>
+<li>
+<p>
+Restore error behavior when running STC from source directory
+</p>
+</li>
+</ul></div>
+</div>
+<div class="sect2">
+<h3 id="_1_6_3">1.6.3</h3>
+<div class="paragraph"><p>Changes to Anaconda packages.</p></div>
+</div>
+<div class="sect2">
 <h3 id="_1_6_2">1.6.2</h3>
 <div class="ulist"><ul>
 <li>
@@ -2080,7 +2157,7 @@ <h3 id="_0_1_0">0.1.0</h3>
 <div id="footer">
 <div id="footer-text">
 Last updated
- 2023-10-25 11:18:55 CST
+ 2024-07-12 13:25:36 CDT
 </div>
 </div>
 </body>
diff --git a/sites.html b/sites.html
index 04e091897..a59e0f4d8 100644
--- a/sites.html
+++ b/sites.html
@@ -747,7 +747,7 @@ <h1>Swift/T Sites Guide</h1>
 <span id="author">Justin M. Wozniak</span><br />
 <span id="email"><code>&lt;<a href="mailto:woz@anl.gov">woz@anl.gov</a>&gt;</code></span><br />
 <span id="revnumber">version 1.6.3,</span>
-<span id="revdate">April 2024</span>
+<span id="revdate">May 2024</span>
 <div id="toc">
   <div id="toctitle">Table of Contents</div>
   <noscript><p><b>JavaScript must be enabled in your browser to display the table of contents.</b></p></noscript>
@@ -4360,7 +4360,7 @@ <h5 id="_build_procedure_15">Build procedure</h5>
 <div id="footer-text">
 Version 1.6.3<br />
 Last updated
- 2024-05-02 11:31:19 CDT
+ 2024-05-02 11:41:26 CDT
 </div>
 </div>
 </body>