diff --git a/pkgs/development/python-modules/pysigma/default.nix b/pkgs/development/python-modules/pysigma/default.nix
index 17e6a27ea57..e0ae16b805f 100644
--- a/pkgs/development/python-modules/pysigma/default.nix
+++ b/pkgs/development/python-modules/pysigma/default.nix
@@ -11,7 +11,7 @@
 
 buildPythonPackage rec {
   pname = "pysigma";
-  version = "0.6.2";
+  version = "0.6.3";
   format = "pyproject";
 
   disabled = pythonOlder "3.8";
@@ -19,8 +19,8 @@ buildPythonPackage rec {
   src = fetchFromGitHub {
     owner = "SigmaHQ";
     repo = "pySigma";
-    rev = "v${version}";
-    hash = "sha256-/SZe4pzlhlkzW84WOjPOibfdznf5uLHL5RsNnT/EL9M=";
+    rev = "refs/tags/v${version}";
+    hash = "sha256-39wp12YDM0Wnl+8tNS6XsoYF+5xM7uQRpUtlo3A2PYE=";
   };
 
   nativeBuildInputs = [