diff --git a/pkgs/development/libraries/sundials/default.nix b/pkgs/development/libraries/sundials/default.nix
index d19ecf34ab95..fb6f773459eb 100644
--- a/pkgs/development/libraries/sundials/default.nix
+++ b/pkgs/development/libraries/sundials/default.nix
@@ -10,14 +10,14 @@ let openblas32 = openblas.override { blas64 = false; };
 
 in stdenv.mkDerivation rec {
   pname = "sundials";
-  version = "5.0.0";
+  version = "5.1.0";
 
   buildInputs = [ python ] ++ stdenv.lib.optionals (lapackSupport) [ gfortran openblas32 ];
   nativeBuildInputs = [ cmake ];
 
   src = fetchurl {
     url = "https://computation.llnl.gov/projects/${pname}/download/${pname}-${version}.tar.gz";
-    sha256 = "1lvx5pddjxgyr8kqlira36kxckz7nxwc8xilzfyx0hf607n42l9l";
+    sha256 = "08cvzmbr2qc09ayq4f5j07lw97hl06q4dl26vh4kh822mm7x28pv";
   };
 
   patches = [
@@ -26,11 +26,6 @@ in stdenv.mkDerivation rec {
       url = "https://github.com/LLNL/sundials/commit/1350421eab6c5ab479de5eccf6af2dcad1eddf30.patch";
       sha256 = "0g67lixp9m85fqpb9rzz1hl1z8ibdg0ldwq5z6flj5zl8a7cw52l";
     })
-    (fetchurl {
-      # https://github.com/LLNL/sundials/pull/20
-      url = "https://github.com/LLNL/sundials/pull/20/commits/2d951bbe1ff7842fcd0dafa28c61b0aa94015f66.patch";
-      sha256 = "0lcr6m4lk14yqrxah4rdscpczny5l7m1zpfsjh8bgspadfsgk512";
-    })
   ];
 
   cmakeFlags = [