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diff --git a/crypto/Readme.html b/crypto/Readme.html
index 363a85636..d71cf63da 100644
--- a/crypto/Readme.html
+++ b/crypto/Readme.html
@@ -32,6 +32,8 @@
                                 <a href="#mozTocId3413">Notes:</a>
                                 <ol>
                                     <li>
+                                        <a href="#mozTocId85330">Release 2.2.1</a>
+                                    <li>
                                         <a href="#mozTocId85329">Release 2.2.0</a>
                                     <li>
                                         <a href="#mozTocId85328">Release 2.1.1</a>
@@ -325,6 +327,24 @@
         <hr style="WIDTH: 100%; HEIGHT: 2px">
         <h3><a class="mozTocH3" name="mozTocId3413"></a>Notes:</h3>
 
+        <h4><a class="mozTocH4" name="mozTocId85330"></a>Release 2.2.1, Friday April 21, 2023</h4>
+        <h5>Defects Fixed</h5>
+        <ul>
+            <li>Due to a defect in the build process, the 2.2.0 release assembly was not optimized. This has been rectified.</li>
+            <li>Fixed a regression in GcmBlockCipher that reduced the output limit to ~2^31 blocks instead of ~2^32 (net60 unaffected).</li>
+            <li>Fixed incomplete DTLS 1.2 Connection ID support for the case of a block cipher being negotiated with the encrypt_then_mac extension (net60 unaffected).</li>
+        </ul>
+        <h5>Additional Features and Functionality</h5>
+        <ul>
+        </ul>
+        <h5>Additional Notes</h5>
+        <ul>
+            <li>
+                See the (cumulative) list of GitHub pull requests that we have accepted at
+                <a href="https://github.com/bcgit/bc-csharp/pulls?q=is%3Apr+is%3Aclosed">bcgit/bc-csharp</a>.
+            </li>
+        </ul>
+
         <h4><a class="mozTocH4" name="mozTocId85329"></a>Release 2.2.0, Monday April 17, 2023</h4>
         <h5>Defects Fixed</h5>
         <ul>