diff --git a/pkgs/development/python-modules/radian/default.nix b/pkgs/development/python-modules/radian/default.nix
index 820e10a40934..09d0c38c4157 100644
--- a/pkgs/development/python-modules/radian/default.nix
+++ b/pkgs/development/python-modules/radian/default.nix
@@ -18,16 +18,16 @@
 
 buildPythonPackage rec {
   pname = "radian";
-  version = "0.6.8";
+  version = "0.6.12";
   format = "setuptools";
 
-  disabled = pythonOlder "3.6";
+  disabled = pythonOlder "3.7";
 
   src = fetchFromGitHub {
     owner = "randy3k";
     repo = pname;
     rev = "refs/tags/v${version}";
-    hash = "sha256-zI6oUHO4rY/BbbHhvzSNIKCpTDRm0cK46rIKN/ISgY0=";
+    hash = "sha256-cojKbDNqcUay5RxvWszQ96eC4jVI4G7iRv/ZYWgidCQ=";
   };
 
   postPatch = ''
diff --git a/pkgs/development/python-modules/rchitect/default.nix b/pkgs/development/python-modules/rchitect/default.nix
index 060fafa8d6e0..cbafc0d2b2b6 100644
--- a/pkgs/development/python-modules/rchitect/default.nix
+++ b/pkgs/development/python-modules/rchitect/default.nix
@@ -8,20 +8,21 @@
 , R
 , rPackages
 , six
+, packaging
 }:
 
 buildPythonPackage rec {
   pname = "rchitect";
-  version = "0.4.4";
+  version = "0.4.6";
   format = "setuptools";
 
-  disabled = pythonOlder "3.6";
+  disabled = pythonOlder "3.7";
 
   src = fetchFromGitHub {
     owner = "randy3k";
     repo = pname;
     rev = "refs/tags/v${version}";
-    hash = "sha256-igrYMgPemYVGDR+eWiqtxFxFjroCyOfKEU0wj8D7ZS8=";
+    hash = "sha256-IVyYzf433m03RRfL5SmUOdaXFy0NHf/QuAdtUeUjIz0=";
   };
 
   postPatch = ''
@@ -32,6 +33,7 @@ buildPythonPackage rec {
   propagatedBuildInputs = [
     cffi
     six
+    packaging
   ] ++ (with rPackages; [
     reticulate
   ]);