diff --git a/pkgs/tools/misc/flexoptix-app/default.nix b/pkgs/tools/misc/flexoptix-app/default.nix
index 1e9b16a84855..6712925d0120 100644
--- a/pkgs/tools/misc/flexoptix-app/default.nix
+++ b/pkgs/tools/misc/flexoptix-app/default.nix
@@ -1,11 +1,11 @@
 { lib, appimageTools, fetchurl, asar }: let
   pname = "flexoptix-app";
-  version = "5.16.0-latest";
+  version = "5.20.0-latest";
 
   src = fetchurl {
     name = "${pname}-${version}.AppImage";
     url = "https://flexbox.reconfigure.me/download/electron/linux/x64/FLEXOPTIX%20App.${version}.AppImage";
-    hash = "sha256-A10r8IUB3zWKWmjen90vLXPF7V/Cgo+DhFn/Hsc1Nhg=";
+    hash = "sha256-/4vZaVLpSiufjNwwofPi+YBtTJ4aq7eYgFnYFv89LFY=";
   };
 
   udevRules = fetchurl {
@@ -19,7 +19,7 @@
 
       # Get rid of the autoupdater
       ${asar}/bin/asar extract $out/resources/app.asar app
-      sed -i 's/async isUpdateAvailable.*/async isUpdateAvailable(updateInfo) { return false;/g' app/node_modules/electron-updater/out/AppUpdater.js
+      patch -p0 < ${./disable-autoupdate.patch}
       ${asar}/bin/asar pack app $out/resources/app.asar
     '';
   });
diff --git a/pkgs/tools/misc/flexoptix-app/disable-autoupdate.patch b/pkgs/tools/misc/flexoptix-app/disable-autoupdate.patch
new file mode 100644
index 000000000000..d71133951e72
--- /dev/null
+++ b/pkgs/tools/misc/flexoptix-app/disable-autoupdate.patch
@@ -0,0 +1,16 @@
+--- app/electron/jsComponents/mainWindowEvents.js	2024-02-18 12:53:41.115773007 -0500
++++ app/electron/jsComponents/mainWindowEvents.js2	2024-02-18 23:22:20.003280203 -0500
+@@ -128,7 +128,12 @@
+ 
+ 	if (app.isPackaged) {
+ 		global.mainWindow.webContents.once("did-finish-load", function () {
+-			autoUpdater.checkForUpdates();
++			global.mainWindow.loadURL(
++				url.format({
++					...global.APPLICATION_URL_OBJECT,
++					slashes: true,
++				}),
++			);
+ 		});
+ 	} else {
+ 		global.mainWindow.webContents.openDevTools();