diff --git a/CHANGELOG.md b/CHANGELOG.md
index 54502cee35e438..5f9a7e491bd3af 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -32,7 +32,8 @@ release.
 </tr>
 <tr>
   <td valign="top">
-<b><a href="doc/changelogs/CHANGELOG_V18.md#18.20.0">18.20.0</a></b><br/>
+<b><a href="doc/changelogs/CHANGELOG_V18.md#18.20.1">18.20.1</a></b><br/>
+<a href="doc/changelogs/CHANGELOG_V18.md#18.20.0">18.20.0</a><br/>
 <a href="doc/changelogs/CHANGELOG_V18.md#18.19.1">18.19.1</a><br/>
 <a href="doc/changelogs/CHANGELOG_V18.md#18.19.0">18.19.0</a><br/>
 <a href="doc/changelogs/CHANGELOG_V18.md#18.18.2">18.18.2</a><br/>
diff --git a/doc/changelogs/CHANGELOG_V18.md b/doc/changelogs/CHANGELOG_V18.md
index ae744792f0684e..1c61f784ddca03 100644
--- a/doc/changelogs/CHANGELOG_V18.md
+++ b/doc/changelogs/CHANGELOG_V18.md
@@ -9,6 +9,7 @@
 </tr>
 <tr>
 <td>
+<a href="#18.20.1">18.20.1</a><br/>
 <a href="#18.20.0">18.20.0</a><br/>
 <a href="#18.19.1">18.19.1</a><br/>
 <a href="#18.19.0">18.19.0</a><br/>
@@ -65,6 +66,25 @@
   * [io.js](CHANGELOG_IOJS.md)
   * [Archive](CHANGELOG_ARCHIVE.md)
 
+<a id="18.20.1"></a>
+
+## 2024-04-03, Version 18.20.1 'Hydrogen' (LTS), @RafaelGSS
+
+This is a security release.
+
+### Notable Changes
+
+* CVE-2024-27983 - Assertion failed in node::http2::Http2Session::\~Http2Session() leads to HTTP/2 server crash- (High)
+* CVE-2024-27982 - HTTP Request Smuggling via Content Length Obfuscation - (Medium)
+* llhttp version 9.2.1
+* undici version 5.28.4
+
+### Commits
+
+* \[[`60d24938de`](https://github.com/nodejs/node/commit/60d24938de)] - **deps**: update undici to v5.28.4 (Matteo Collina) [nodejs-private/node-private#577](https://github.com/nodejs-private/node-private/pull/577)
+* \[[`5d4d5848cf`](https://github.com/nodejs/node/commit/5d4d5848cf)] - **http**: do not allow OBS fold in headers by default (Paolo Insogna) [nodejs-private/node-private#558](https://github.com/nodejs-private/node-private/pull/558)
+* \[[`0fb816dbcc`](https://github.com/nodejs/node/commit/0fb816dbcc)] - **src**: ensure to close stream when destroying session (Anna Henningsen) [nodejs-private/node-private#561](https://github.com/nodejs-private/node-private/pull/561)
+
 <a id="18.20.0"></a>
 
 ## 2024-03-26, Version 18.20.0 'Hydrogen' (LTS), @richardlau
diff --git a/src/node_version.h b/src/node_version.h
index 4f6895d389b215..6973a3d0fd8b12 100644
--- a/src/node_version.h
+++ b/src/node_version.h
@@ -29,7 +29,7 @@
 #define NODE_VERSION_IS_LTS 1
 #define NODE_VERSION_LTS_CODENAME "Hydrogen"
 
-#define NODE_VERSION_IS_RELEASE 0
+#define NODE_VERSION_IS_RELEASE 1
 
 #ifndef NODE_STRINGIFY
 #define NODE_STRINGIFY(n) NODE_STRINGIFY_HELPER(n)