diff --git a/pkgs/applications/misc/gcalcli/default.nix b/pkgs/applications/misc/gcalcli/default.nix
index 759d4983921e..6a55f0ff7420 100644
--- a/pkgs/applications/misc/gcalcli/default.nix
+++ b/pkgs/applications/misc/gcalcli/default.nix
@@ -2,29 +2,30 @@
   stdenv,
   lib,
   fetchFromGitHub,
-  python3,
-  libnotify ? null,
+  python3Packages,
+  libnotify,
 }:
 
-with python3.pkgs;
-
-buildPythonApplication rec {
+python3Packages.buildPythonApplication rec {
   pname = "gcalcli";
   version = "4.3.0";
+  pyproject = true;
 
   src = fetchFromGitHub {
     owner = "insanum";
-    repo = pname;
-    rev = "v${version}";
-    sha256 = "0s5fhcmz3n0dwh3vkqr4aigi59q43v03ch5jhh6v75149icwr0df";
+    repo = "gcalcli";
+    rev = "refs/tags/v${version}";
+    hash = "sha256-roHMWUwklLMNhLJANsAeBKcSX1Qk47kH5A3Y8SuDrmg=";
   };
 
   postPatch = lib.optionalString stdenv.isLinux ''
     substituteInPlace gcalcli/argparsers.py \
-      --replace "'notify-send" "'${libnotify}/bin/notify-send"
+      --replace-fail "'notify-send" "'${lib.getExe libnotify}"
   '';
 
-  propagatedBuildInputs = [
+  build-system = with python3Packages; [ setuptools ];
+
+  dependencies = with python3Packages; [
     python-dateutil
     gflags
     httplib2
@@ -37,7 +38,7 @@ buildPythonApplication rec {
     libnotify
   ];
 
-  nativeCheckInputs = [ pytestCheckHook ];
+  nativeCheckInputs = with python3Packages; [ pytestCheckHook ];
 
   meta = with lib; {
     description = "CLI for Google Calendar";