diff --git a/pkgs/development/python-modules/pycep-parser/default.nix b/pkgs/development/python-modules/pycep-parser/default.nix
index 3e8104ea33b..7a5178cb228 100644
--- a/pkgs/development/python-modules/pycep-parser/default.nix
+++ b/pkgs/development/python-modules/pycep-parser/default.nix
@@ -12,7 +12,7 @@
 
 buildPythonPackage rec {
   pname = "pycep-parser";
-  version = "0.3.4";
+  version = "0.3.5";
   format = "pyproject";
 
   disabled = pythonOlder "3.7";
@@ -20,8 +20,8 @@ buildPythonPackage rec {
   src = fetchFromGitHub {
     owner = "gruebel";
     repo = "pycep";
-    rev = version;
-    hash = "sha256-o2sYPvZVevDqZV8EtKWTL2zHHzX2kmTZ4iVHsUhFv7M=";
+    rev = "refs/tags/${version}";
+    hash = "sha256-Nj/drNRSIBh8DaE+vzQRijQg8NVUK5qBClwU3aWiA48=";
   };
 
   nativeBuildInputs = [