diff --git a/pkgs/development/python-modules/pynrrd/default.nix b/pkgs/development/python-modules/pynrrd/default.nix
index 641cd6bd1280..612e5075807b 100644
--- a/pkgs/development/python-modules/pynrrd/default.nix
+++ b/pkgs/development/python-modules/pynrrd/default.nix
@@ -6,13 +6,13 @@
 
 buildPythonPackage rec {
   pname = "pynrrd";
-  version = "0.4.2";
+  version = "0.4.3";
 
   src = fetchFromGitHub {
     owner = "mhe";
     repo = pname;
-    rev = "v${version}";
-    sha256 = "1wn3ara3i19fi1y9a5j4imyczpa6dkkzd5djggxg4kkl1ff9awrj";
+    rev = "refs/tags/v${version}";
+    sha256 = "sha256-4UM2NAKWfsjxAoLQCFSPVKG5GukxqppywqvLM0V/dIs=";
   };
 
   propagatedBuildInputs = [ numpy ];