diff --git a/pkgs/top-level/python-packages.nix b/pkgs/top-level/python-packages.nix
index 556eb6b80a0..2514315ca90 100644
--- a/pkgs/top-level/python-packages.nix
+++ b/pkgs/top-level/python-packages.nix
@@ -4325,14 +4325,16 @@ in modules // {
   };
 
   bcrypt = buildPythonPackage rec {
-    name = "bcrypt-2.0.0";
+    name = "bcrypt-${version}";
+    version = "2.0.0";
 
     src = pkgs.fetchurl {
-      url = "mirror://pypi/b/bcrypt/${name}.tar.gz";
-      sha256 = "8b2d197ef220d10eb74625dde7af3b10daa973ae9a1eadd6366f763fad4387fa";
+      url = "https://api.github.com/repos/pyca/bcrypt/tarball/${version}";
+      name = "bcrypt-${version}.tar.gz";
+      sha256 = "14i1yp4qkjklx82jl61cjjcw367lc0pkvnix3gaz451ijdcmz3x8";
     };
-
-    buildInputs = with self; [ pycparser mock pytest py ] ++ optionals (!isPyPy) [ cffi ];
+    buildInputs = with self; [ pycparser mock pytest py ];
+    propagatedBuildInputs = with self; optional (!isPyPy) cffi;
 
     meta = {
       maintainers = with maintainers; [ domenkozar ];
@@ -13171,7 +13173,7 @@ in modules // {
     disabled = !isPy27;
 
     propagatedBuildInputs = with self; [ numpy matplotlib scipy ];
-   
+
     meta = {
       description = "Interfaces and utilities for the NEURON simulator and analysis of neural data";
       maintainers = [ maintainers.nico202 ];
@@ -27757,7 +27759,7 @@ in modules // {
     };
 
     propagatedBuildInputs = with self; [
-      numpy 
+      numpy
       Theano
     ];