diff --git a/pkgs/development/libraries/libcerf/default.nix b/pkgs/development/libraries/libcerf/default.nix
index 287c9a61b9c7..7a3b96314189 100644
--- a/pkgs/development/libraries/libcerf/default.nix
+++ b/pkgs/development/libraries/libcerf/default.nix
@@ -1,16 +1,20 @@
-{ stdenv, lib, fetchurl, cmake, perl }:
+{ stdenv, lib, fetchurl, cmake, perl, gnuplot }:
 
 stdenv.mkDerivation rec {
   pname = "libcerf";
-  version = "2.0";
+  version = "2.1";
 
   src = fetchurl {
     url = "https://jugit.fz-juelich.de/mlz/libcerf/-/archive/v${version}/libcerf-v${version}.tar.gz";
-    sha256 = "05lpaxmy6275nbzvf1ahxcfymyph89pvlgg8h9sp9iwal4g8nvn8";
+    sha256 = "sha256-ihzYt/rgS4KpUWglISm4wbrKCYooX/jT8leB3q0Ut1o=";
   };
 
   nativeBuildInputs = [ cmake perl ];
 
+  passthru.tests = {
+    inherit gnuplot;
+  };
+
   meta = with lib; {
     description = "Complex error (erf), Dawson, Faddeeva, and Voigt function library";
     homepage = "https://jugit.fz-juelich.de/mlz/libcerf";