diff --git a/pkgs/development/python-modules/sortedcollections/default.nix b/pkgs/development/python-modules/sortedcollections/default.nix
index 3742c625205..b0b3df19bac 100644
--- a/pkgs/development/python-modules/sortedcollections/default.nix
+++ b/pkgs/development/python-modules/sortedcollections/default.nix
@@ -1,27 +1,31 @@
 { stdenv
 , buildPythonPackage
-, fetchPypi
+, fetchFromGitHub
+, pytestCheckHook
 , sortedcontainers
 }:
 
 buildPythonPackage rec {
   pname = "sortedcollections";
-  version = "1.2.1";
+  version = "1.2.3";
 
-  src = fetchPypi {
-    inherit pname version;
-    sha256 = "0sihzm5aqz7r3irh4jn6rzicb7lf81d27z7vl6kaslnhwcsizhsq";
+  src = fetchFromGitHub {
+    owner = "grantjenks";
+    repo = "python-sortedcollections";
+    rev = "v${version}";
+    sha256 = "06ifkbhkj5fpsafibw0fs7b778g7q0gd03crvbjk04k0f3wjxc5z";
   };
 
   propagatedBuildInputs = [ sortedcontainers ];
 
-  # No tests in PyPi tarball
-  doCheck = false;
+  checkInputs = [ pytestCheckHook ];
+
+  pythonImportsCheck = [ "sortedcollections" ];
 
   meta = with stdenv.lib; {
     description = "Python Sorted Collections";
     homepage = "http://www.grantjenks.com/docs/sortedcollections/";
-    license = licenses.asl20;
+    license = with licenses; [ asl20 ];
+    maintainers = with maintainers; [ fab ];
   };
-
 }
diff --git a/pkgs/tools/audio/google-music-scripts/default.nix b/pkgs/tools/audio/google-music-scripts/default.nix
index 272cf902539..481a7ecb75b 100644
--- a/pkgs/tools/audio/google-music-scripts/default.nix
+++ b/pkgs/tools/audio/google-music-scripts/default.nix
@@ -26,11 +26,11 @@ buildPythonApplication rec {
     sha256 = "0apwgj86whrc077dfymvyb4qwj19bawyrx49g4kg364895v0rbbq";
   };
 
-  # pendulum pinning was to prevent PEP517 from trying to build from source
+  # there are already later releases present
   postPatch = ''
     substituteInPlace setup.py \
       --replace "tomlkit>=0.5,<0.6" "tomlkit" \
-      --replace "pendulum>=2.0,<=3.0,!=2.0.5,!=2.1.0" "pendulum"
+      --replace "attrs>=18.2,<19.4" "attrs"
   '';
 
   propagatedBuildInputs = [