diff --git a/pkgs/by-name/es/esphome/dashboard.nix b/pkgs/by-name/es/esphome/dashboard.nix
index cdbab8d18f13..301bb8ae675b 100644
--- a/pkgs/by-name/es/esphome/dashboard.nix
+++ b/pkgs/by-name/es/esphome/dashboard.nix
@@ -13,19 +13,19 @@
 
 buildPythonPackage rec {
   pname = "esphome-dashboard";
-  version = "20250514.0";
+  version = "20250814.0";
   pyproject = true;
 
   src = fetchFromGitHub {
     owner = "esphome";
     repo = "dashboard";
     rev = "refs/tags/${version}";
-    hash = "sha256-t0+YlITnxgnLrK/SN0bSmMIv3djR9DKMlnFrR9Btwx8=";
+    hash = "sha256-WQsyv3s3LKKOwYEkX5GcAPnbH061q1ts7TU4HU6I8CI=";
   };
 
   npmDeps = fetchNpmDeps {
     inherit src;
-    hash = "sha256-Uiz26kPxoz32t/GRppiYiVBVwWcQqUzPr0kScVUZak8=";
+    hash = "sha256-ShuJPS7qP2XZ3lwJrFeKRkQwX7tvyiC/0L7sGn0cMn8=";
   };
 
   build-system = [ setuptools ];
diff --git a/pkgs/by-name/es/esphome/esp32-post-build-esptool-reference.patch b/pkgs/by-name/es/esphome/esp32-post-build-esptool-reference.patch
new file mode 100644
index 000000000000..6f323145e85f
--- /dev/null
+++ b/pkgs/by-name/es/esphome/esp32-post-build-esptool-reference.patch
@@ -0,0 +1,13 @@
+diff --git a/esphome/components/esp32/post_build.py.script b/esphome/components/esp32/post_build.py.script
+index c99521423..e29821d7e 100644
+--- a/esphome/components/esp32/post_build.py.script
++++ b/esphome/components/esp32/post_build.py.script
+@@ -88,8 +88,6 @@ def merge_factory_bin(source, target, env):
+     output_path = firmware_path.with_suffix(".factory.bin")
+     python_exe = f'"{env.subst("$PYTHONEXE")}"'
+     cmd = [
+-        python_exe,
+-        "-m",
+         "esptool",
+         "--chip",
+         chip,
diff --git a/pkgs/by-name/es/esphome/package.nix b/pkgs/by-name/es/esphome/package.nix
index ef77f7baaf53..fce4a85e7f8c 100644
--- a/pkgs/by-name/es/esphome/package.nix
+++ b/pkgs/by-name/es/esphome/package.nix
@@ -34,16 +34,24 @@ let
 in
 python.pkgs.buildPythonApplication rec {
   pname = "esphome";
-  version = "2025.7.5";
+  version = "2025.8.0";
   pyproject = true;
 
   src = fetchFromGitHub {
     owner = "esphome";
     repo = "esphome";
     tag = version;
-    hash = "sha256-f6HBgjg6yiFCQk6hIvQMYw+5/KjIVvUJaK+c/xmIseM=";
+    hash = "sha256-LOHsiSiqeCLrKLcVfAiPZl54aDTaYuKw073h0XMDiTE=";
   };
 
+  patches = [
+    # Use the esptool executable directly in the ESP32 post build script, that
+    # gets executed by platformio. This is required, because platformio uses its
+    # own python environment through `python -m esptool` and then fails to find
+    # the esptool library.
+    ./esp32-post-build-esptool-reference.patch
+  ];
+
   build-system = with python.pkgs; [
     setuptools
   ];
diff --git a/pkgs/development/embedded/platformio/core.nix b/pkgs/development/embedded/platformio/core.nix
index 541c119f3051..f0afbb6b5642 100644
--- a/pkgs/development/embedded/platformio/core.nix
+++ b/pkgs/development/embedded/platformio/core.nix
@@ -72,6 +72,7 @@ buildPythonApplication rec {
     click
     click-completion
     colorama
+    esp-idf-size
     git
     intelhex
     lockfile
@@ -81,6 +82,7 @@ buildPythonApplication rec {
     pyserial
     pyyaml
     requests
+    rich-click
     semantic-version
     setuptools
     spdx-license-list-data.json
diff --git a/pkgs/development/python-modules/esp-idf-size/default.nix b/pkgs/development/python-modules/esp-idf-size/default.nix
new file mode 100644
index 000000000000..71b492d97f74
--- /dev/null
+++ b/pkgs/development/python-modules/esp-idf-size/default.nix
@@ -0,0 +1,59 @@
+{
+  lib,
+  buildPythonPackage,
+  fetchFromGitHub,
+
+  # build-system
+  setuptools,
+
+  # dependencies
+  pyyaml,
+  rich,
+
+  # tests
+  esptool,
+  jsonschema,
+  pytestCheckHook,
+  distutils,
+}:
+
+buildPythonPackage rec {
+  pname = "esp-idf-size";
+  version = "1.7.1";
+  pyproject = true;
+
+  src = fetchFromGitHub {
+    owner = "espressif";
+    repo = "esp-idf-size";
+    tag = "v${version}";
+    hash = "sha256-dgvmrwnaipudKyNJ/xFAwvfjGmtDRnFbXxI2VuC/SKo=";
+  };
+
+  build-system = [ setuptools ];
+
+  dependencies = [
+    pyyaml
+    rich
+  ];
+
+  doCheck = false; # requires ESP-IDF
+
+  nativeCheckInputs = [
+    distutils
+    esptool
+    jsonschema
+    pytestCheckHook
+  ];
+
+  pythonImportsCheck = [
+    "esp_idf_size"
+  ];
+
+  meta = {
+    description = "";
+    homepage = "https://github.com/espressif/esp-idf-size";
+    changelog = "https://github.com/espressif/esp-idf-size/blob/${src.tag}/CHANGELOG.md";
+    license = lib.licenses.asl20;
+    maintainers = with lib.maintainers; [ hexa ];
+  };
+}
diff --git a/pkgs/top-level/python-packages.nix b/pkgs/top-level/python-packages.nix
index afb3dbb3fda4..aafdab065454 100644
--- a/pkgs/top-level/python-packages.nix
+++ b/pkgs/top-level/python-packages.nix
@@ -4739,6 +4739,8 @@ self: super: with self; {
 
   esig = callPackage ../development/python-modules/esig { };
 
+  esp-idf-size = callPackage ../development/python-modules/esp-idf-size { };
+
   espeak-phonemizer = callPackage ../development/python-modules/espeak-phonemizer { };
 
   esper = callPackage ../development/python-modules/esper { };