diff --git a/pkgs/development/libraries/itk/default.nix b/pkgs/development/libraries/itk/default.nix
index a459bd82755f..3577e7a8196d 100644
--- a/pkgs/development/libraries/itk/default.nix
+++ b/pkgs/development/libraries/itk/default.nix
@@ -1,11 +1,14 @@
-{ stdenv, fetchurl, cmake, libX11, libuuid, xz, vtk, darwin }:
+{ stdenv, fetchFromGitHub, cmake, libX11, libuuid, xz, vtk, darwin }:
 
 stdenv.mkDerivation rec {
-  name = "itk-5.0.0";
+  pname = "itk";
+  version = "5.0.1";
 
-  src = fetchurl {
-    url = mirror://sourceforge/itk/InsightToolkit-5.0.0.tar.xz;
-    sha256 = "0bs63mk4q8jmx38f031jy5w5n9yy5ng9x8ijwinvjyvas8cichqi";
+  src = fetchFromGitHub {
+    owner = "InsightSoftwareConsortium";
+    repo = "ITK";
+    rev = "v${version}";
+    sha256 = "0dcjsn5frjnrphfgw8alnd2ahrvicpx2a2ngb5ixaa9anaicz9z1";
   };
 
   cmakeFlags = [
diff --git a/pkgs/development/libraries/simpleitk/default.nix b/pkgs/development/libraries/simpleitk/default.nix
index 90dfe8ebfab8..1cf40c92db66 100644
--- a/pkgs/development/libraries/simpleitk/default.nix
+++ b/pkgs/development/libraries/simpleitk/default.nix
@@ -1,13 +1,14 @@
-{ stdenv, fetchurl, cmake, git, swig, lua, itk }:
+{ stdenv, fetchFromGitHub, cmake, git, swig, lua, itk, tcl, tk }:
 
 stdenv.mkDerivation rec {
-  pname    = "simpleitk";
-  version = "1.2.0";
-  name  = "${pname}-${version}";
+  pname = "simpleitk";
+  version = "1.2.2";
 
-  src = fetchurl {
-    url    = "https://sourceforge.net/projects/${pname}/files/SimpleITK/${version}/Source/SimpleITK-${version}.tar.gz";
-    sha256 = "10lxsr0144li6bmfgs646cvczczqkgmvvs3ndds66q8lg9zwbnky";
+  src = fetchFromGitHub {
+    owner = "SimpleITK";
+    repo = "SimpleITK";
+    rev = "v${version}";
+    sha256 = "1cgq9cxxplv6bkm2zfvcc0lgyh5zw1hbry30k1429n9737wnadaw";
   };
 
   nativeBuildInputs = [ cmake git swig ];
@@ -21,7 +22,7 @@ stdenv.mkDerivation rec {
     homepage = http://www.simpleitk.org;
     description = "Simplified interface to ITK";
     maintainers = with maintainers; [ bcdarwin ];
-    platforms = platforms.unix;
+    platforms = platforms.linux;
     license = licenses.asl20;
   };
 }