diff --git a/pkgs/tools/backup/tarsnapper/default.nix b/pkgs/tools/backup/tarsnapper/default.nix
index 447057448f87..b4d731984f71 100644
--- a/pkgs/tools/backup/tarsnapper/default.nix
+++ b/pkgs/tools/backup/tarsnapper/default.nix
@@ -1,20 +1,35 @@
 { lib
 , python3Packages
 , fetchFromGitHub
+, fetchpatch
 , tarsnap
 }:
 
 python3Packages.buildPythonApplication rec {
   pname = "tarsnapper";
-  version = "0.4";
+  version = "0.5";
+  pyproject = true;
 
   src = fetchFromGitHub {
     owner = "miracle2k";
     repo = pname;
     rev = version;
-    sha256 = "03db49188f4v1946c8mqqj30ah10x68hbg3a58js0syai32v12pm";
+    hash = "sha256-5i9eum9hbh6VFhvEIDq5Uapy6JtIbf9jZHhRYZVoC1w=";
   };
 
+  patches = [
+    # Fix failing tests when default_deltas is None
+    (fetchpatch {
+      url = "https://github.com/miracle2k/tarsnapper/commit/2ee33ce748b9bb42d559cc2c0104115732cb4150.patch";
+      hash = "sha256-fEXGhzlfB+J5lw1pcsC5Ne7I8UMnDzwyyCx/zm15+fU=";
+    })
+  ];
+
+  nativeBuildInputs = with python3Packages; [
+    pythonRelaxDepsHook
+    setuptools
+  ];
+
   propagatedBuildInputs = with python3Packages; [
     pyyaml
     python-dateutil
@@ -22,28 +37,22 @@ python3Packages.buildPythonApplication rec {
   ];
 
   nativeCheckInputs = with python3Packages; [
+    pytestCheckHook
     nose
   ];
 
-  patches = [
-    # Remove standard module argparse from requirements
-    ./remove-argparse.patch
-  ];
+  # Remove standard module argparse from requirements
+  pythonRemoveDeps = [ "argparse" ];
 
   makeWrapperArgs = [ "--prefix PATH : ${lib.makeBinPath [ tarsnap ]}" ];
 
-  checkPhase = ''
-    runHook preCheck
-    nosetests tests
-    runHook postCheck
-  '';
-
   pythonImportsCheck = [ "tarsnapper" ];
 
   meta = with lib; {
     description = "Wrapper which expires backups using a gfs-scheme";
     homepage = "https://github.com/miracle2k/tarsnapper";
     license = licenses.bsd2;
-    maintainers = with maintainers; [ ];
+    maintainers = with maintainers; [ gmacon ];
+    mainProgram = "tarsnapper";
   };
 }
diff --git a/pkgs/tools/backup/tarsnapper/remove-argparse.patch b/pkgs/tools/backup/tarsnapper/remove-argparse.patch
deleted file mode 100644
index 19c7f9f172e2..000000000000
--- a/pkgs/tools/backup/tarsnapper/remove-argparse.patch
+++ /dev/null
@@ -1,10 +0,0 @@
---- tarsnapper-0.4-src.org/setup.py	1980-01-02 00:00:00.000000000 +0000
-+++ tarsnapper-0.4-src/setup.py	2017-07-16 10:54:36.596499451 +0100
-@@ -45,6 +45,6 @@
-       url='https://github.com/miracle2k/tarsnapper',
-       license='BSD',
-       packages=['tarsnapper'],
--      install_requires = ['argparse>=1.1', 'pyyaml>=3.09', 'python-dateutil>=2.4.0', 'pexpect>=3.1'],
-+      install_requires = ['pyyaml>=3.09', 'python-dateutil>=2.4.0', 'pexpect>=3.1'],
-       **kw
- )