diff --git a/pkgs/development/python-modules/agate/default.nix b/pkgs/development/python-modules/agate/default.nix
index 21691b5c408d..80daa780685b 100644
--- a/pkgs/development/python-modules/agate/default.nix
+++ b/pkgs/development/python-modules/agate/default.nix
@@ -14,7 +14,6 @@
 , pytimeparse
 , pythonOlder
 , pytz
-, six
 }:
 
 buildPythonPackage rec {
@@ -22,12 +21,12 @@ buildPythonPackage rec {
   version = "1.7.1";
   format = "setuptools";
 
-  disabled = pythonOlder "3.6";
+  disabled = pythonOlder "3.7";
 
   src = fetchFromGitHub {
     owner = "wireservice";
     repo = pname;
-    rev = version;
+    rev = "refs/tags/${version}";
     hash = "sha256-7Ew9bgeheymCL8xXSW5li0LdFvGYb/7gPxmC4w6tHvM=";
   };
 
@@ -38,7 +37,6 @@ buildPythonPackage rec {
     parsedatetime
     python-slugify
     pytimeparse
-    six
   ];
 
   nativeCheckInputs = [
@@ -50,12 +48,6 @@ buildPythonPackage rec {
     pytz
   ];
 
-  postPatch = ''
-    # No Python 2 support, thus constraint is not needed
-    substituteInPlace setup.py \
-      --replace "'parsedatetime>=2.1,!=2.5,!=2.6'," "'parsedatetime>=2.1',"
-  '';
-
   checkPhase = ''
     LC_ALL="en_US.UTF-8" nosetests tests
   '';
@@ -67,6 +59,7 @@ buildPythonPackage rec {
   meta = with lib; {
     description = "Python data analysis library that is optimized for humans instead of machines";
     homepage = "https://github.com/wireservice/agate";
+    changelog = "https://github.com/wireservice/agate/blob/${version}/CHANGELOG.rst";
     license = with licenses; [ mit ];
     maintainers = with maintainers; [ vrthra ];
   };