diff --git a/pkgs/development/python-modules/acme/default.nix b/pkgs/development/python-modules/acme/default.nix
index 503c6f796591..b65f60745f25 100644
--- a/pkgs/development/python-modules/acme/default.nix
+++ b/pkgs/development/python-modules/acme/default.nix
@@ -1,6 +1,7 @@
 { buildPythonPackage
 , certbot
 , nose
+, pytest
 , cryptography
 , pyasn1
 , pyopenssl
@@ -8,6 +9,7 @@
 , josepy
 , pytz
 , requests
+, requests-toolbelt
 , six
 , werkzeug
 , mock
@@ -20,11 +22,11 @@ buildPythonPackage rec {
   pname = "acme";
 
   propagatedBuildInputs = [
-    cryptography pyasn1 pyopenssl pyRFC3339 pytz requests six werkzeug mock
-    ndg-httpsclient josepy
+    cryptography pyasn1 pyopenssl pyRFC3339 pytz requests requests-toolbelt six
+    werkzeug mock ndg-httpsclient josepy
   ];
 
-  checkInputs = [ nose ];
+  checkInputs = [ nose pytest ];
 
   postUnpack = "sourceRoot=\${sourceRoot}/acme";