diff --git a/pkgs/tools/admin/simp_le/default.nix b/pkgs/tools/admin/simp_le/default.nix
index fdb531736d05..8925610bebfb 100644
--- a/pkgs/tools/admin/simp_le/default.nix
+++ b/pkgs/tools/admin/simp_le/default.nix
@@ -10,7 +10,7 @@ pythonPackages.buildPythonApplication rec {
     sha256 = "0x8gqazn09m30bn1l7xnf8snhbb7yz7sb09imciqmm4jqdvn797z";
   };
 
-  propagatedBuildInputs = with pythonPackages; [ acme ];
+  propagatedBuildInputs = with pythonPackages; [ acme_0_5_0 ];
 
   meta = with stdenv.lib; {
     inherit (src.meta) homepage;
diff --git a/pkgs/top-level/python-packages.nix b/pkgs/top-level/python-packages.nix
index 07f20189253d..080ab3427b61 100644
--- a/pkgs/top-level/python-packages.nix
+++ b/pkgs/top-level/python-packages.nix
@@ -370,6 +370,27 @@ in modules // {
     };
   };
 
+  acme_0_5_0 = buildPythonPackage rec {
+    version = "0.5.0";
+    name = "acme-${version}";
+
+    src = pkgs.fetchFromGitHub {
+      owner = "letsencrypt";
+      repo = "letsencrypt";
+      rev = "v${version}";
+      sha256 = "0x098cdyfgqvh7x5d3sz56qjpjyg5b4fl82086sm43d8mbz0h5rm";
+    };
+
+    propagatedBuildInputs = with self; [
+      cryptography pyasn1 pyopenssl pyRFC3339 pytz requests2 six werkzeug mock
+      ndg-httpsclient
+    ];
+
+    buildInputs = with self; [ nose ];
+
+    sourceRoot = "letsencrypt-v${version}-src/acme";
+  };
+
   acme = buildPythonPackage rec {
     inherit (pkgs.certbot) src version;