diff --git a/pkgs/development/python-modules/pysmart/default.nix b/pkgs/development/python-modules/pysmart/default.nix
index 3bd5fa50a133..b5c45e2c02c7 100644
--- a/pkgs/development/python-modules/pysmart/default.nix
+++ b/pkgs/development/python-modules/pysmart/default.nix
@@ -8,13 +8,13 @@
 
 buildPythonPackage rec {
   pname = "pysmart";
-  version = "1.1.0";
+  version = "1.2.1";
 
   src = fetchFromGitHub {
     owner = "truenas";
     repo = "py-SMART";
-    rev = "v${version}";
-    sha256 = "sha256-e46ALiYg0Db/gOzqLmVc1vi9ObhfxzqwfQk9/9pz+r0=";
+    rev = "refs/tags/v${version}";
+    sha256 = "sha256-slLk4zoW0ht9hiOxyBt0caekjrPgih9G99pRiD2vIxE=";
   };
 
   postPatch = ''