diff --git a/pkgs/development/libraries/science/math/petsc/default.nix b/pkgs/development/libraries/science/math/petsc/default.nix
index dd3d6ab787f..e3594d72eda 100644
--- a/pkgs/development/libraries/science/math/petsc/default.nix
+++ b/pkgs/development/libraries/science/math/petsc/default.nix
@@ -2,11 +2,11 @@
 
 stdenv.mkDerivation rec {
   pname = "petsc";
-  version = "3.13.2";
+  version = "3.13.3";
 
   src = fetchurl {
     url = "http://ftp.mcs.anl.gov/pub/petsc/release-snapshots/petsc-${version}.tar.gz";
-    sha256 = "0yf5lm8dqpbz1yq9nvd5g2iy2w0rgjp9vcj44ba63rwig37j3clp";
+    sha256 = "0fhydhws57hvxv7mkldlicm2xmmnb9f4nhd8n16idxg4snck38vz";
   };
 
   nativeBuildInputs = [ blas gfortran gfortran.cc.lib lapack python ];
@@ -15,7 +15,7 @@ stdenv.mkDerivation rec {
   # process. The original script in upstream is both a shell script and a
   # python script, where the shellscript just finds a suitable python
   # interpreter to execute the python script. See
-  # https://github.com/NixOS/nixpkgs/pull/89299#discussion_r450203444 
+  # https://github.com/NixOS/nixpkgs/pull/89299#discussion_r450203444
   # for more details.
   prePatch = ''
     substituteInPlace configure \