diff --git a/pkgs/development/python-modules/pg8000/default.nix b/pkgs/development/python-modules/pg8000/default.nix
index ad51a80674b..3cf843b864c 100644
--- a/pkgs/development/python-modules/pg8000/default.nix
+++ b/pkgs/development/python-modules/pg8000/default.nix
@@ -1,19 +1,19 @@
 { lib
 , buildPythonPackage
 , fetchPypi
-, scramp
-, isPy3k
 , passlib
+, pythonOlder
+, scramp
 }:
 
 buildPythonPackage rec {
   pname = "pg8000";
-  version = "1.17.0";
-  disabled = !isPy3k;
+  version = "1.18.0";
+  disabled = pythonOlder "3.6";
 
   src = fetchPypi {
     inherit pname version;
-    sha256 = "sha256-FBmMWv6yiRBuQO5uXkwFKcU2mTn2yliKAos3GnX+IN0=";
+    sha256 = "1nkjxf95ldda41mkmahbikhd1fvxai5lfjb4a5gyhialpz4g5fim";
   };
 
   propagatedBuildInputs = [ passlib scramp ];
diff --git a/pkgs/development/python-modules/scramp/default.nix b/pkgs/development/python-modules/scramp/default.nix
index 7beefa4e899..dc57461d549 100644
--- a/pkgs/development/python-modules/scramp/default.nix
+++ b/pkgs/development/python-modules/scramp/default.nix
@@ -1,16 +1,23 @@
-{ lib, buildPythonPackage, fetchFromGitHub, pytestCheckHook }:
+{ lib
+, asn1crypto
+, buildPythonPackage
+, fetchFromGitHub
+, pytestCheckHook
+}:
 
 buildPythonPackage rec {
   pname = "scramp";
-  version = "1.2.0";
+  version = "1.2.2";
 
   src = fetchFromGitHub {
     owner = "tlocke";
     repo = "scramp";
     rev = version;
-    sha256 = "15jb7z5l2lijxr60fb9v55i3f81h6d83c0b7fv5q0fv5q259nv0a";
+    sha256 = "sha256-d/kfrhvU96eH8TQX7n1hVRclEFWLseEvOxiR6VaOdrg=";
   };
 
+  propagatedBuildInputs = [ asn1crypto ];
+
   checkInputs = [ pytestCheckHook ];
 
   pythonImportsCheck = [ "scramp" ];