diff --git a/pkgs/development/python-modules/emcee/default.nix b/pkgs/development/python-modules/emcee/default.nix
index f41bfae5942..c79adccc41f 100644
--- a/pkgs/development/python-modules/emcee/default.nix
+++ b/pkgs/development/python-modules/emcee/default.nix
@@ -8,13 +8,13 @@
 
 buildPythonPackage rec {
   pname = "emcee";
-  version = "3.1.1";
+  version = "3.1.2";
 
   src = fetchFromGitHub {
     owner = "dfm";
     repo = pname;
-    rev = "v${version}";
-    sha256 = "0q9dj7mihjjkcy6famzwhz1xcxxzzvm00n01w4bbm66ax9zvis52";
+    rev = "refs/tags/v${version}";
+    sha256 = "sha256-MguhnLLo1zeNuMca8vWpxwysh9YJDD+IzvGQDbScK2M=";
   };
 
   SETUPTOOLS_SCM_PRETEND_VERSION = version;