diff --git a/pkgs/development/python-modules/eiswarnung/default.nix b/pkgs/development/python-modules/eiswarnung/default.nix
index 87ff2a4287a..8bea9552b35 100644
--- a/pkgs/development/python-modules/eiswarnung/default.nix
+++ b/pkgs/development/python-modules/eiswarnung/default.nix
@@ -12,7 +12,7 @@
 
 buildPythonPackage rec {
   pname = "eiswarnung";
-  version = "1.0.0";
+  version = "1.1.0";
   format = "pyproject";
 
   disabled = pythonOlder "3.9";
@@ -20,8 +20,8 @@ buildPythonPackage rec {
   src = fetchFromGitHub {
     owner = "klaasnicolaas";
     repo = "python-eiswarnung";
-    rev = "v${version}";
-    hash = "sha256-Cw/xRypErasdrOZJ/0dWLl4eYH01vBI9mYm98teIdRc=";
+    rev = "refs/tags/v${version}";
+    hash = "sha256-fyxqVSZcbo/rrItad5ZTwmp4N8s0HGBdxvx3LBax/hc=";
   };
 
   nativeBuildInputs = [