diff --git a/pkgs/development/arduino/platformio/core.nix b/pkgs/development/arduino/platformio/core.nix
index 0d333a49d37a..d83013dbbde5 100644
--- a/pkgs/development/arduino/platformio/core.nix
+++ b/pkgs/development/arduino/platformio/core.nix
@@ -51,14 +51,14 @@ let
 
 in buildPythonApplication rec {
   pname = "platformio";
-  version = "4.3.1";
+  version = "4.3.4";
 
   # pypi tarballs don't contain tests - https://github.com/platformio/platformio-core/issues/1964
   src = fetchFromGitHub {
     owner = "platformio";
     repo = "platformio-core";
     rev = "v${version}";
-    sha256 = "1dxnjy60zpkgyrbvbf6b9qi6m37gm8gwjmxwfj30npr1y7rvxwrw";
+    sha256 = "0vf2j79319ypr4yrdmx84853igkb188sjfvlxgw06rlsvsm3kacq";
   };
 
   propagatedBuildInputs =  [
diff --git a/pkgs/development/arduino/platformio/use-local-spdx-license-list.patch b/pkgs/development/arduino/platformio/use-local-spdx-license-list.patch
index 16294a4d6cd6..953eb3c92893 100644
--- a/pkgs/development/arduino/platformio/use-local-spdx-license-list.patch
+++ b/pkgs/development/arduino/platformio/use-local-spdx-license-list.patch
@@ -8,7 +8,7 @@ index be49b3ee..d1390a88 100644
      def load_spdx_licenses():
 -        r = requests.get(
 -            "https://raw.githubusercontent.com/spdx/license-list-data"
--            "/v3.8/json/licenses.json"
+-            "/v3.9/json/licenses.json"
 -        )
 -        r.raise_for_status()
 -        return r.json()