diff --git a/pkgs/development/python-modules/ebcdic/default.nix b/pkgs/development/python-modules/ebcdic/default.nix
index 2c925eedd853..40aa8512dce9 100644
--- a/pkgs/development/python-modules/ebcdic/default.nix
+++ b/pkgs/development/python-modules/ebcdic/default.nix
@@ -2,25 +2,25 @@
   lib,
   buildPythonPackage,
   fetchFromGitHub,
-  setuptools,
+  flit-core,
   pytestCheckHook,
 }:
 
-buildPythonPackage rec {
+buildPythonPackage (finalAttrs: {
   pname = "ebcdic";
-  version = "1.1.1";
+  version = "2.0.0";
   pyproject = true;
 
   src = fetchFromGitHub {
     owner = "roskakori";
     repo = "CodecMapper";
-    tag = "v${version}";
-    hash = "sha256-gRyZychcF3wYocgVbdF255cSuZh/cl8X0WH/Iplkmxc=";
+    tag = "v${finalAttrs.version}";
+    hash = "sha256-71EMWUGoJrsc3EOVHeV4xqSJRKoA7Sz2dvmZJ1sjQCg=";
   };
 
-  sourceRoot = "${src.name}/${pname}";
+  sourceRoot = "${finalAttrs.src.name}/${finalAttrs.pname}";
 
-  nativeBuildInputs = [ setuptools ];
+  build-system = [ flit-core ];
 
   nativeCheckInputs = [ pytestCheckHook ];
 
@@ -40,4 +40,4 @@ buildPythonPackage rec {
     license = lib.licenses.bsd2;
     maintainers = with lib.maintainers; [ fab ];
   };
-}
+})
diff --git a/pkgs/development/python-modules/extract-msg/default.nix b/pkgs/development/python-modules/extract-msg/default.nix
index 633218c3621b..d0cd36b0d317 100644
--- a/pkgs/development/python-modules/extract-msg/default.nix
+++ b/pkgs/development/python-modules/extract-msg/default.nix
@@ -31,13 +31,13 @@ buildPythonPackage (finalAttrs: {
     hash = "sha256-n/v3ubgzWlWqLXZfy1O7+FvTJoLMtgL7DFPL39SZnfM=";
   };
 
-  build-system = [
-    setuptools
-  ];
-
   pythonRelaxDeps = [
     "beautifulsoup4"
+    "ebcdic"
   ];
+
+  build-system = [ setuptools ];
+
   dependencies = [
     beautifulsoup4
     compressed-rtf
diff --git a/pkgs/development/python-modules/oletools/default.nix b/pkgs/development/python-modules/oletools/default.nix
index 2ccd85b43e80..2d10dfe9509a 100644
--- a/pkgs/development/python-modules/oletools/default.nix
+++ b/pkgs/development/python-modules/oletools/default.nix
@@ -7,11 +7,12 @@
   msoffcrypto-tool,
   olefile,
   pcodedmp,
+  setuptools,
   pyparsing,
   pytestCheckHook,
 }:
 
-buildPythonPackage rec {
+buildPythonPackage (finalAttrs: {
   pname = "oletools";
   version = "0.60.2";
   format = "setuptools";
@@ -19,11 +20,15 @@ buildPythonPackage rec {
   src = fetchFromGitHub {
     owner = "decalage2";
     repo = "oletools";
-    rev = "v${version}";
+    tag = "v${finalAttrs.version}";
     hash = "sha256-ons1VeWStxUZw2CPpnX9p5I3Q7cMhi34JU8TeuUDt+Y=";
   };
 
-  propagatedBuildInputs = [
+  pythonRelaxDeps = [ "pyparsing" ];
+
+  build-system = [ setuptools ];
+
+  dependencies = [
     colorclass
     easygui
     msoffcrypto-tool
@@ -34,15 +39,14 @@ buildPythonPackage rec {
 
   nativeCheckInputs = [ pytestCheckHook ];
 
-  postPatch = ''
-    substituteInPlace setup.py \
-      --replace "pyparsing>=2.1.0,<3" "pyparsing>=2.1.0"
-  '';
-
   disabledTests = [
     # Test fails with AssertionError: Tuples differ: ('MS Word 2007+...
     "test_all"
     "test_xlm"
+    # AssertionError: Found "warn" in output...
+    "test_empty_behaviour"
+    "test_rtf_behaviour"
+    "test_text_behaviour"
   ];
 
   pythonImportsCheck = [ "oletools" ];
@@ -50,10 +54,11 @@ buildPythonPackage rec {
   meta = {
     description = "Module to analyze MS OLE2 files and MS Office documents";
     homepage = "https://github.com/decalage2/oletools";
+    changelog = "https://github.com/decalage2/oletools/releases/tag/${finalAttrs.src.tag}";
     license = with lib.licenses; [
       bsd2 # and
       mit
     ];
     maintainers = with lib.maintainers; [ fab ];
   };
-}
+})