diff --git a/pkgs/development/python-modules/effect/default.nix b/pkgs/development/python-modules/effect/default.nix
index 3a026103a15c..8e4ad446746a 100644
--- a/pkgs/development/python-modules/effect/default.nix
+++ b/pkgs/development/python-modules/effect/default.nix
@@ -8,12 +8,12 @@
 , testtools
 }:
 buildPythonPackage rec {
-  version = "0.11.0";
+  version = "0.12.0";
   pname = "effect";
 
   src = fetchPypi {
     inherit pname version;
-    sha256 = "1q75w4magkqd8ggabhhzzxmxakpdnn0vdg7ygj89zdc9yl7561q6";
+    sha256 = "0s8zsncq4l0ar2b4dijf8yzrk13x2swr1w2nb30s1p5jd6r24czl";
   };
   checkInputs = [
     pytest
@@ -24,10 +24,8 @@ buildPythonPackage rec {
     attrs
   ];
   checkPhase = ''
-    pytest .
+    pytest
   '';
-  # Tests fails on python3.7 https://github.com/python-effect/effect/issues/78
-  doCheck = !isPy37;
   meta = with lib; {
     description = "Pure effects for Python";
     homepage = https://github.com/python-effect/effect;