diff --git a/build-on-mac.spec b/build-on-mac.spec
index 73111e8..61d6c73 100644
--- a/build-on-mac.spec
+++ b/build-on-mac.spec
@@ -1,11 +1,20 @@
 # -*- mode: python ; coding: utf-8 -*-
 
+import os
+
+# We need to add the flasher stub JSON files explicitly: https://github.com/espressif/esptool/issues/1059
+venv_python_folder_name = next(d for d in os.listdir('./.venv/lib') if d.startswith('python') and os.path.isdir(os.path.join('./.venv/lib', d)))
+local_stub_flasher_path = "./.venv/lib/{}/site-packages/esptool/targets/stub_flasher".format(venv_python_folder_name)
 
 a = Analysis(
     ['nodemcu-pyflasher.py'],
     pathex=[],
     binaries=[],
-    datas=[("images", "images")],
+    datas=[
+        ("images", "images"),
+        ("{}/1".format(local_stub_flasher_path), "./esptool/targets/stub_flasher/1"),
+        ("{}/2".format(local_stub_flasher_path), "./esptool/targets/stub_flasher/2")
+    ],
     hiddenimports=[],
     hookspath=[],
     hooksconfig={},
diff --git a/build-on-win.spec b/build-on-win.spec
index 6d17b6e..5d3fb79 100644
--- a/build-on-win.spec
+++ b/build-on-win.spec
@@ -1,11 +1,17 @@
 # -*- mode: python ; coding: utf-8 -*-
 
+# We need to add the flasher stub JSON files explicitly: https://github.com/espressif/esptool/issues/1059
+local_stub_flasher_path = "./.venv/Lib/site-packages/esptool/targets/stub_flasher"
 
 a = Analysis(
     ['nodemcu-pyflasher.py'],
     pathex=[],
     binaries=[],
-    datas=[("images", "images")],
+    datas=[
+        ("images", "images"),
+        ("{}/1".format(local_stub_flasher_path), "./esptool/targets/stub_flasher/1"),
+        ("{}/2".format(local_stub_flasher_path), "./esptool/targets/stub_flasher/2")
+    ],
     hiddenimports=[],
     hookspath=[],
     hooksconfig={},
diff --git a/requirements.txt b/requirements.txt
index ce5f586..f9c736e 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,9 +1,6 @@
-# Can't use v4 atm, see https://github.com/marcelstoer/nodemcu-pyflasher/issues/105
-esptool==3.3.3
+esptool==4.8.1
 pyserial~=3.5
-# https://github.com/wxWidgets/Phoenix/issues/2499 prevents the use of 4.2.1.
-# 4.2.0 requires Python <=3.10 apparently.
-wxPython==4.2.0
-PyInstaller==6.9.0
+wxPython==4.2.2
+PyInstaller==6.11.1
 httplib2>=0.18.1
 pyinstaller-versionfile>=2.0.0