diff --git a/ports/treehh/copyright b/ports/treehh/copyright
index 2fcaf2b3a48..98d917afa36 100644
--- a/ports/treehh/copyright
+++ b/ports/treehh/copyright
@@ -1,5 +1,5 @@
-Copyright (C) 2001-2020 Kasper Peeters <kasper@phi-sci.com>
-Distributed under the GNU General Public License version 3.
+Copyright (C) 2001-2022 Kasper Peeters <kasper@phi-sci.com>
+Distributed under the GNU General Public License version 2 or 3.
 
 Special permission to use tree.hh under the conditions of a 
 different license can be requested from the author.
diff --git a/ports/treehh/portfile.cmake b/ports/treehh/portfile.cmake
index 1546f36403d..e020c546e63 100644
--- a/ports/treehh/portfile.cmake
+++ b/ports/treehh/portfile.cmake
@@ -1,8 +1,8 @@
 vcpkg_from_github(
     OUT_SOURCE_PATH SOURCE_PATH
     REPO kpeeters/tree.hh
-    REF 8dc57bc2bb7cd2fd1d6e777c6b5b58db0c3852ef
-    SHA512 a40481952802fdfab05159822b012a576ea956135a44f88d93844cb578c49ed5fb6fb7330bce699d7fa6ba1da65d12b284b6e9e6b103eadfd76cbc96d6839db5
+    REF 42531adcf9d1ff51c5bc1b068a9c57a8a8a912a7
+    SHA512 793981f69a487a5c2aaa654c98725c0b5bbcc086a43b6f1501c5a8359dba87d6e90ff7507313fcf1ded5054a9f2551e174323c9017a9c6ae87da2c2966e73d7f
     HEAD_REF master
 )
 
diff --git a/ports/treehh/vcpkg.json b/ports/treehh/vcpkg.json
index 85147876d93..7c53a9d476c 100644
--- a/ports/treehh/vcpkg.json
+++ b/ports/treehh/vcpkg.json
@@ -1,6 +1,7 @@
 {
   "name": "treehh",
-  "version": "3.16",
+  "version": "3.18",
   "description": "An STL-like C++ header-only tree library",
-  "homepage": "https://github.com/kpeeters/tree.hh"
+  "homepage": "https://github.com/kpeeters/tree.hh",
+  "license": "GPL-2.0-only OR GPL-3.0-only"
 }
diff --git a/versions/baseline.json b/versions/baseline.json
index 281f7c6bb8a..69391421116 100644
--- a/versions/baseline.json
+++ b/versions/baseline.json
@@ -7573,7 +7573,7 @@
       "port-version": 0
     },
     "treehh": {
-      "baseline": "3.16",
+      "baseline": "3.18",
       "port-version": 0
     },
     "treehopper": {
diff --git a/versions/t-/treehh.json b/versions/t-/treehh.json
index 536eaa5427f..a93583d8716 100644
--- a/versions/t-/treehh.json
+++ b/versions/t-/treehh.json
@@ -1,5 +1,10 @@
 {
   "versions": [
+    {
+      "git-tree": "5191bee7045ad9a49b4180614a6178e5e3c38061",
+      "version": "3.18",
+      "port-version": 0
+    },
     {
       "git-tree": "935cf42d03c842e7408961440ece8a94303d45a6",
       "version": "3.16",