diff --git a/pkgs/development/python-modules/pwlf/default.nix b/pkgs/development/python-modules/pwlf/default.nix
index 51de118a3d3a..8f420e45d61e 100644
--- a/pkgs/development/python-modules/pwlf/default.nix
+++ b/pkgs/development/python-modules/pwlf/default.nix
@@ -12,14 +12,14 @@
 
 buildPythonPackage rec {
   pname = "pwlf";
-  version = "2.3.0";
+  version = "2.4.0";
   pyproject = true;
 
   src = fetchFromGitHub {
     owner = "cjekel";
     repo = "piecewise_linear_fit_py";
-    tag = "v${version}";
-    hash = "sha256-FAH38mSaABdNR8lpxxA/YVo5ec2WYOMEsAQqravbM9k=";
+    tag = "v.${version}";
+    hash = "sha256-TamFg+bX8QPRjY0HdrYviJRP8VwM7ucDFE2eZz5xNr0=";
   };
 
   nativeBuildInputs = [