diff --git a/ports/gtkmm/gtk.patch b/ports/gtkmm/gtk.patch
deleted file mode 100644
index fd8b17d0719bfb..00000000000000
--- a/ports/gtkmm/gtk.patch
+++ /dev/null
@@ -1,17 +0,0 @@
-diff --git a/untracked/gtk/gtkmm/iconpaintable.h b/untracked/gtk/gtkmm/iconpaintable.h
-index b659ed22..c4c56600 100644
---- "a/untracked/gtk/gtkmm/iconpaintable.h"	
-+++ "b/untracked/gtk/gtkmm/iconpaintable.h"
-@@ -29,11 +29,10 @@
- #include <glibmm/object.h>
- #include <gdkmm/paintable.h>
- #include <giomm/file.h>
-+#include <gtk/gtk.h>
- 
- 
- #ifndef DOXYGEN_SHOULD_SKIP_THIS
--using GtkIconPaintable = struct _GtkIconPaintable;
--using GtkIconPaintableClass = struct _GtkIconPaintableClass;
- #endif /* DOXYGEN_SHOULD_SKIP_THIS */
- 
- 
diff --git a/ports/gtkmm/portfile.cmake b/ports/gtkmm/portfile.cmake
index afb21efd9166f6..6ca1cbedf9d784 100644
--- a/ports/gtkmm/portfile.cmake
+++ b/ports/gtkmm/portfile.cmake
@@ -2,18 +2,16 @@ string(REGEX MATCH "^([0-9]*[.][0-9]*)" GTKMM_MAJOR_MINOR "${VERSION}")
 vcpkg_download_distfile(ARCHIVE
     URLS "https://ftp.gnome.org/pub/GNOME/sources/gtkmm/${GTKMM_MAJOR_MINOR}/gtkmm-${VERSION}.tar.xz"
     FILENAME "gtkmm-${VERSION}.tar.xz"
-    SHA512 94cf1f764e539b8b1fdff101f6e134c5e2bc9379f1dae3b6daef66ab94e90f5e70a41d8eb94842fd54c0f8706c565e975fa2adf6e4c6913cecaeb3c8cf00a1cd
+    SHA512 c65bfa6dc0788cdd698c25e3b29861cb47aa0cd9c8bd3632005958ecd5a8d92802fc8ecaf498bcfc281a9b4035e751eeb6c05fa351f4b14c063870218127dabd
 )
 
 vcpkg_extract_source_archive(
     SOURCE_PATH
-    ARCHIVE ${ARCHIVE}
-    PATCHES
-        gtk.patch
+    ARCHIVE "${ARCHIVE}"
 )
 
 vcpkg_configure_meson(
-    SOURCE_PATH ${SOURCE_PATH}
+    SOURCE_PATH "${SOURCE_PATH}"
     OPTIONS
         -Dmsvc14x-parallel-installable=false # Use separate DLL and LIB filenames for Visual Studio 2017 and 2019
         -Dbuild-tests=false
diff --git a/ports/gtkmm/vcpkg.json b/ports/gtkmm/vcpkg.json
index b88010dec6eba5..932105dce5d43e 100644
--- a/ports/gtkmm/vcpkg.json
+++ b/ports/gtkmm/vcpkg.json
@@ -1,7 +1,6 @@
 {
   "name": "gtkmm",
-  "version": "4.14.0",
-  "port-version": 1,
+  "version": "4.20.0",
   "description": "gtkmm is the official C++ interface for the popular GUI library GTK+.",
   "homepage": "https://www.gtkmm.org/",
   "license": "LGPL-3.0-or-later",
diff --git a/versions/baseline.json b/versions/baseline.json
index 819ba3dd86f572..8819b9fcb71f5b 100644
--- a/versions/baseline.json
+++ b/versions/baseline.json
@@ -3589,8 +3589,8 @@
       "port-version": 3
     },
     "gtkmm": {
-      "baseline": "4.14.0",
-      "port-version": 1
+      "baseline": "4.20.0",
+      "port-version": 0
     },
     "gtl": {
       "baseline": "1.2.0",
diff --git a/versions/g-/gtkmm.json b/versions/g-/gtkmm.json
index 7e21dff34ba58f..b793ec4431d0e5 100644
--- a/versions/g-/gtkmm.json
+++ b/versions/g-/gtkmm.json
@@ -1,5 +1,10 @@
 {
   "versions": [
+    {
+      "git-tree": "5ca079b1d25e02a1ebd0390c33d3003a3d8bd172",
+      "version": "4.20.0",
+      "port-version": 0
+    },
     {
       "git-tree": "2b05ebe5f3e9df8f79f113375600b813f247648b",
       "version": "4.14.0",